Emerging 2026 Research Is Pointing to a New Root Cause of Post-Viral Fatigue Syndrome — and What Can Finally Be Done About It
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Post-Viral Fatigue Syndrome · Health & Science Research
Emerging 2026 Research Is Pointing to a New Root Cause of Post-Viral Fatigue Syndromeand What Can Finally Be Done About It

Thousands with post-viral fatigue syndrome are seeing real, documented change in symptoms they were told were permanent.

Reviewed & verified by independent specialists

For thirty years, never recovering from a virus has meant one thing: the infection is over, the tests are normal, and whatever is left is yours to manage.

The treatment playbook has followed from that assumption.

Rest and time, because post-viral fatigue "resolves in six to eight weeks." An antidepressant when it doesn't. A sleep aid for the nights. A walking program for the deconditioning. Low-dose naltrexone, antivirals, and a shelf of supplements from the internet when the prescriptions fall short.

And the same conversation at the end of the appointment: the virus is gone, everything looks normal, it has been too long for this to still be the infection.

For thirty years, that has been the entire picture of this condition.

What has been missing from that picture is the answer to the most basic question a patient can ask.

If the virus is gone, why am I still sick?

It is a question that has come up in appointments. In support groups. In the parked car after the grocery store, waiting to have enough left to drive home.

And for thirty years, the honest answer medicine has been able to give is: we know the infection is over, we can see it on the tests, but we do not know what is keeping you here.

That is finally beginning to change.

Over the last several years, research out of infectious disease and connective tissue laboratories across the US and Europe has been narrowing in on an answer — and it is not one anyone was looking for.

Because in post-viral fatigue syndrome, the problem is not where anyone has been looking.

The infection left something behind. Something that is still there years later, in a tissue no blood panel, antibody test, or scan was ever designed to see.

And thousands of people with post-viral fatigue syndrome have already begun acting on it. Many years past the infection that started it. Most having failed everything on the standard list.

All of them now documenting the kind of real, measured results this condition has almost never produced.

Here is what the research shows.

The Same Illness After Every Virus

For years, this was treated as a dozen different conditions.

The people who never recovered from mono went to one specialist. The people who never recovered from the flu went to another. Pneumonia was a third. Shingles, RSV, a stomach virus, a bad week one winter that was never named — each one its own story. And when COVID arrived, Long COVID became yet another — with its own clinics, its own funding, its own research program, and six years of studies that treated it as something entirely new.

Nobody compared them, because nobody thought they were the same thing.

That only changed recently. In the last year, researchers began taking the mountain of Long COVID data and setting it next to what existed on patients who had never recovered from the flu, from pneumonia, and from mono — most of it small studies that had sat in the literature for years without anyone connecting them.

The result was not what anyone expected. The symptoms were virtually the same. Not similar. The exact same.

Evidence Peer-Reviewed Findings
01 One Illness, Not Four
Patients still symptomatic after influenza and after COVID were compared directly: 23.0% versus 21.4% at twelve weeks, statistically identical. Across mono, pneumonia, influenza, and COVID, 15–19% were still sick at six months — with a symptom profile that was virtually identical across all four: exhaustion, whole-body pain, brain fog, normal tests.
Brown et al., BMJ Public Health · 2024  ·  Sandler et al., Open Forum Infectious Diseases · 2024  ·  Choutka et al., Nature Medicine · 2025

That is the finding that changed how this condition is understood — and it is recent enough that most physicians have not caught up to it.

It explained why the illness had been so hard to see. It had been split across a dozen diagnoses and a dozen specialties, so no one had ever looked at the whole thing. And it meant something more. Different viruses cannot produce one identical illness. Whatever is keeping these patients sick is not coming from the specific virus.

It is coming from something every body does in response to a serious infection.

Which raises the obvious question. What does the body actually do?

The Tissue No Test Was Designed to See

If the illness is the same after every virus, then whatever the infection leaves behind has to be somewhere every one of those infections reaches — and somewhere every test misses.

Bloodwork measures what is in the blood. An antibody test confirms the infection happened. A chest X-ray looks at the lungs. Every standard test a post-viral patient has ever been given looks at one organ, or one number, at a time.

None of them look at the tissue those organs sit inside.

That tissue is called fascia.

Fascia is the connective tissue that fills the space between everything else in the body — between every muscle, around every organ, under the skin, along every nerve and every blood vessel, from the scalp to the soles of the feet. If everything else were removed, what remained would be a single continuous sheet in the shape of the person. It is the tissue every other structure sits inside.

It wraps every muscle like a stocking. It holds nearly every nerve in place. In a healthy body it is soft, hydrated, and slippery — a wet cushion around everything it surrounds.

Nothing is felt from it, because nothing is supposed to be. It is invisible by design. And it stays that way for one reason: the body continuously supplies it with the specific nutrients it needs to stay soft and hydrated and hold water.

Over the last two years, research groups in Berlin and Copenhagen began doing what no standard test does — taking tissue samples from patients who were still sick six months or more after a viral infection, and measuring the fascia directly.

What they found was not normal.

Evidence Peer-Reviewed Findings
02 Fascia Measurably Denser in Patients Still Sick Six Months After Infection
In patients with post-viral symptoms lasting six months or more, the fascia surrounding the smallest blood vessels was 38% thicker than in healthy controls, measured across more than 3,700 individual tissue samples. 75% of patients showed the same thickening around the vessels, nerve branches, and muscle. Fascial remodeling genes were switched on. The virus itself was not found in the tissue.
Aschman et al., Acta Neuropathologica Communications · 2025  ·  Hejbøl et al., European Journal of Neurology · 2024

The fascia in these patients had dried out. It had thickened. It had hardened — the soft, hydrated cushion turning into a stiff layer that compresses the muscles, nerves, and blood vessels running through it. Not during flares. Around the clock, for years.

The finding has since been repeated in the two largest post-viral groups.

Evidence Peer-Reviewed Findings
03 Confirmed in Long COVID and Influenza
Long COVID patients showed the same fascial densification, with fewer capillaries per unit of tissue than controls, and the changes were measurably worse 48 hours after exertion. Influenza patients still symptomatic at twelve weeks showed an identical rate of ongoing impairment — 4.4% versus 4.1% — consistent with the same tissue change after a different virus.
Appelman et al., Nature Communications · 2025  ·  Brown et al., BMJ Public Health · 2024

Four research groups. Four countries. The same tissue, in the same state.

The normal test results were never evidence that nothing was wrong. They were evidence that nothing had looked here.

In 2026, this process has become known as fascial densification — the measurable stiffening and dehydration of the body's connective tissue. And once it is understood, every symptom a post-viral patient lives with traces back to the same place.

Why Every Symptom Finally Makes Sense

Once fascial densification is understood, every symptom of post-viral fatigue syndrome — the ones that seemed random, the ones no medication has fully touched, the ones patients have been told are in their heads — starts to fit together. Not as a dozen unrelated problems. As one problem, showing up in a dozen places.

01
The exhaustion that sleep won't fix
Waking up more tired than going to bed Nine hours of sleep, still flattened Done by two in the afternoon Never feeling actually rested

When fascia is stiff and densified, every movement the body makes takes more energy than it should. Getting out of bed. Standing at the counter. Walking to the car. Climbing a single flight of stairs. Every muscle in the body is working against a layer of tissue that has hardened around it and refuses to give. By ten in the morning, the body has already burned through a full day of energy — not because it did anything, but because the resistance is constant, and it starts the moment the eyes open. And because the densified tissue keeps the nervous system in fight-or-flight all night, the body never drops into the deep rest where it actually recharges.

It's not that she is tired because she didn't sleep enough. It's that her body is fighting itself, every hour of every day — and never gets the rest that would let it stop.
02
The brain fog
Losing the word mid-sentence Reading the same paragraph three times Walking into a room and forgetting why Thinking through wet wool

The fascia in the neck and at the base of the skull surrounds the arteries, nerves, and lymphatic vessels that carry oxygen, nutrients, and signals to the brain. When that fascia hardens and thickens, it compresses those pathways — reducing the flow of everything the brain depends on to think clearly. The result is not a broken brain. It is a starved one. Words slip. Names disappear mid-sentence. Simple tasks take three times as long. Reading the same page four times becomes normal.

It's not that she is losing her mind. It's that her brain is not getting what it needs to function.
03
The whole-body aching and muscle pain
The flu ache, months after the flu Muscles that burn after a short walk Hurting everywhere and nowhere in particular Ibuprofen that doesn't touch it

Almost every pain nerve in the body is embedded inside fascia. When the fascia is soft and hydrated, those nerves sit cushioned and quiet. When it dries out and hardens, it compresses them — thousands of them, throughout the entire body, at once. A compressed nerve fires. So the body aches everywhere, deeply, for no injury anyone can find, in exactly the way it ached during the worst week of the infection — because the tissue is in the same state it was in then. It just never got the signal to let go.

It's not that something is injured. It's that the tissue around every pain nerve in the body has hardened, and it has been compressing them since the infection.
Evidence Peer-Reviewed Findings
04 The Hydration Mechanism in Densified Fascia
Densified fascia is not a loss of the tissue's structure — it is a loss of the water-holding molecules that keep its layers apart. As hydration drops, the layers collapse together and the tissue hardens. Restoring those molecules is what allows it to rehydrate.
Stecco et al., Journal of Anatomy · 2024  ·  Pratt, Cureus · 2024

For years, post-viral patients have been told to push through. Told it was depression. Told they were deconditioned. Told it had been too long to still be the virus. Left to explain to spouses, employers, and children why they cannot do what they used to do — while their tests kept coming back normal.

Now, for the first time, every symptom above is explained by the same finding — a single densified layer of fascia, doing the same thing everywhere in the body at once.

Not a mystery. Not a collection of complaints. Not something in their heads. Not something more time would have fixed.

One tissue, in one state, producing everything they have been living with — and everything they have been trying to explain — for years.

How Healthy Fascia Ends Up That Way

Which leaves the question every patient asks next. How does healthy fascia end up in that state?

The answer starts with the virus. Any virus.

When a serious virus takes hold — the flu, COVID, pneumonia, mono, it makes no difference — the body goes into survival mode. It is the same threat response every human body runs when it is fighting for its life. The immune system mobilizes. Energy demand spikes. Fever burns through reserves. And to fuel the fight, the body reroutes its water and nutrient supply toward the organs it cannot afford to lose — the heart, the lungs, the brain, the immune system — and away from everything it can afford to run lean for a couple of weeks.

This is not new science. It is an accepted, well-mapped part of human physiology. Every human body does it. Every human body is supposed to.

Fascia is one of the first places that supply gets pulled from.

Evidence Peer-Reviewed Findings
05 Water and Nutrient Redirection During Infection
During an immune response, the activated immune system commands up to 2,000 kJ of the body's energy per day, and the body reallocates blood flow, water, and nutrient supply toward vital organs and the immune fight — and away from non-essential tissues, including connective tissue. The program is built for illnesses lasting days. Run for months, it becomes harmful.
Straub et al., Zeitschrift für Rheumatologie · 2025

And this is why it doesn't matter which virus. Different infections, one response. The tissue the body pulls supply from is the same tissue — and what happens to that tissue afterward is the same, no matter what started it.

For most people, this is invisible and temporary. The virus runs its course, the threat response ends, and the body turns the full flow of water and nutrients back on. The fascia gets everything it had before. It rehydrates, it softens, and within a few weeks nothing about it is any different than it was before the illness. The ache fades with the fever. Two weeks later, they have forgotten it.

In the 15–19% who develop post-viral fatigue syndrome, the flow never fully comes back.

The virus ends. The fever breaks. The tests come back clear. But when the body turns the supply back on, it does not turn it all the way on. The fascia goes from getting everything it needs to getting a fraction of it — enough to keep the tissue alive, not enough to keep it soft, hydrated, and supple. And a tissue that is not getting enough to maintain its state does not hold its state. It slowly loses it.

This is why post-viral fatigue syndrome does not get better on its own — and why, for so many people, it slowly gets worse. The fascia is not damaged once and then left alone. It is being undersupplied every single day. Month after month, it holds a little less water than it did the month before. It thickens a little more. It compresses the muscles, nerves, and vessels inside it a little harder. The exhaustion deepens. The aching spreads. The fog thickens. Not because anything new has happened — because the same shortfall has been running, uninterrupted, since the infection.

Waiting cannot fix it, because waiting does not change the supply. Rest cannot fix it, because rest does not change the supply. Nothing on the standard shelf was ever aimed at the supply — or at the tissue that has been living on a fraction of it for years.

Which is why, on its own, it never resolves. And why "give it a few more months" stops working after month three.

Why Nothing on the Standard Shelf Has Ever Worked

Most people who have had post-viral fatigue syndrome for any length of time have cycled through the standard shelf — usually without anyone calling it a shelf, because no one ever called the condition by its name.

Rest. A walking program. An antidepressant. A sleep aid. Valacyclovir, for the ones whose virus had a name. Low-dose naltrexone. IV vitamins. Massage. A stack of ten to twenty supplements. In some cases, thousands of dollars on clinics that would not have taken them if they'd known which virus it was.

And every one of them comes with the same pattern. A small shift. A plateau. Then back to where things started.

The reason is simple: every one of them was aimed at something other than the fascia.

Rest lowers the demand on a body with no reserve, and does nothing to rehydrate the tissue — "when they gave me rest, I stiffened up like a board." The walking program was aimed at deconditioning; the muscles were never deconditioned, they were compressed, and asking them for more left the body worse than before. The antidepressant was aimed at the mood. The sleep aid put the body to sleep without letting it leave survival mode. The antiviral was aimed at a virus that was no longer the problem.

Every one of those treatments quiets a symptom the densified fascia is producing. None of them touch the fascia itself. The tissue is still compressing the same nerves. The body is still locked in fight-or-flight. Everything producing the symptoms is still running underneath.

It is like putting a bucket under a leaking ceiling. The floor stays dry. The hole in the roof keeps getting worse.

What Finally Reaches the Real Problem

Which raised the obvious question.

If the fascia is densified — and if nothing on the standard shelf has ever been aimed at the fascia — then the real answer is not another month of waiting, another antidepressant, another walking program.

The real answer is to give the fascia back the specific nutrients it stopped receiving. Enough of them, in the right forms, to rehydrate the tissue and lift the densification everything else is running on.

The problem is that the science of fascia is very new. Almost no serious research existed on this tissue until the last five years. And none of the research that did exist had ever been directed at the question that matters most — what specific nutrients does the body need to rehydrate densified fascia?

The question itself was newer than the field's ability to answer it.

The Turning Point Came in 2026

That is finally changing.

In early 2025, a small group of clinicians and fascia specialists were watching the post-viral research come in — the four-virus comparison, the biopsies out of Berlin and Copenhagen, the tissue changes that showed up on the biopsies — and realized something that didn't make sense.

The research had identified the tissue. The connective tissue labs had already isolated the nutrients the body uses to keep fascia hydrated — the doses, the forms. Every piece existed.

And no one had built anything with it. Millions of people who never recovered from a virus, a documented finding in their tissue, and not a single product on the market designed to address it — because the post-viral world was studying the virus, and the fascia researchers weren't building supplements.

So rather than wait for someone else, they decided to be first.

They founded a company called Fascial Labs, and spent the better part of a year on the formulation — sourcing the right form of each nutrient, testing doses, running iterations, working the enzymatic support required to reach the hardened tissue underneath.

What came out of it is called TrueForm® Fascial Releasethe first supplement built specifically to rehydrate densified fascia.

In early 2026, Fascial Labs released the first production run of TrueForm® to an initial cohort of 1,047 adults with post-viral fatigue syndrome — every one of them at least a year past the infection that started it, split across the flu, COVID, pneumonia, mono, and viruses that were never identified, every one having already failed at least two interventions from the standard shelf — and tracked their symptoms across a 90-day window.

By day 90, the numbers that came back changed how the researchers understood the finding itself.

The Real-World Results

The cohort was chosen deliberately. Every participant had been, before the virus, some version of the same person: an active adult. Runners. Nurses. Teachers. Parents. People who worked full-time and had a life outside of it. They enrolled at various points in the condition — some a year past the flu, some a decade past mono — and all of them had done the standard rounds. Over the first 90 days, the participants reported the following.

67%
reported a meaningful reduction in morning exhaustion and the feeling of never having rested by week four
63%
reported a meaningful reduction in whole-body aching and muscle pain by week six
69%
reported deeper, more restorative sleep by week eight
61%
reported a meaningful lift in brain fog and cognitive clarity by week ten
But the number the researchers behind the study were watching most closely — was a different one:
82%
of participants reported feeling like themselves again by day 90.
Not managing. Not coping. The person they were before the infection — coming back.
Every response came from a real person filling out a form on their phone, in their own words, on their own time.

Inside the Formulation

TrueForm® was built around the specific nutrients research has identified as central to fascial rehydration — the same nutrients the body produces on its own when healthy, and stops producing enough of as the fascia goes without. Each one targets a different part of the finding.

Hyaluronic Acid
The molecule fascia uses to hold water. Without it, no amount of hydration reaches the tissue — replenishing it is what allows the fascia to rehydrate from the inside. Many post-viral patients drink four liters of water a day and still describe their tissue as dry. This is why.
Bamboo Silica bambusa vulgaris
The mineral responsible for fascial elasticity — the property that lets the tissue soften and give again instead of staying rigid. Almost entirely stripped from modern food, and one of the reasons densified fascia so rarely rehydrates on its own.
Serrapeptase
A proteolytic enzyme that helps break down the hardened, densified layers accumulated inside compromised fascia. Many post-viral patients have already found their way to this enzyme on their own. Here it is at a clinical dose, and paired with the hydrating compounds needed to rehydrate what it clears — the piece that has been missing from standalone enzyme protocols.
Pycnogenol French maritime pine bark extract
A polyphenol that supports blood flow and vessel function in the microcirculation running through fascia — helping restore delivery to tissue that has been undersupplied since the infection.
Grape Seed Extract proanthocyanidin C1
Supports the connective tissue matrix itself, reinforcing the structural integrity of the fascia as the main ingredients do their work.
Behind those is a supporting matrix of complementary nutrients — trace minerals, botanicals, and connective tissue precursors — that reinforce the fascia as the primary ingredients rehydrate it. As the fascia rehydrates and the densification lifts, the compression on the muscles, nerves, and blood vessels releases. The aching eases. The nervous system begins to settle, the exhaustion and the fog begin to lift, and the baseline begins to hold. The version of the body that existed before the infection starts coming back.
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The Protocol
Two capsules a day. That's it.
One in the morning, one at night. With or without food. No tracking. No stack to coordinate. No timing to manage. Capsules can be opened and taken with food for anyone who has trouble swallowing pills.
No stimulants No fillers or unnecessary excipients No exercise required No prescription No diet rules
Manufactured in an FDA-registered, GMP-certified facility in the US · Third-party tested · Fully vegan

Safe alongside everything already in the protocol.

TrueForm® is compatible with everything currently used for post-viral fatigue syndrome — antidepressants, sleep medication, low-dose naltrexone, antivirals, beta blockers, electrolyte protocols, and every prescription in the standard pool. Because the formulation is made entirely from natural ingredients, there are no known interactions, and no need to come off anything to begin. TrueForm® is not an antiviral. It does not compete with anything aimed at the virus — it addresses the tissue those treatments were never aimed at.

Anyone taking blood thinners or immunosuppressants, anyone with kidney or liver disease, and anyone who is pregnant or nursing should check with their physician before starting any new supplement. And anyone with chest pain, new shortness of breath, palpitations, fainting, sudden swelling in one leg, or sudden weakness or trouble speaking should seek medical care right away — those are not post-viral fatigue, and they need to be looked at.

Most people start TrueForm® alongside whatever they've been taking, and let the fascia respond.

Most advice for post-viral fatigue asks patients to wait longer, rest more, or push harder. TrueForm® asks for two capsules a day.

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The 90-Day Guarantee

If a formulation eases the aching and lifts the exhaustion and the fog in the majority of adults who have already tried everything on the standard shelf — standing behind it should not be complicated.

Any customer who takes TrueForm® for the full 90 days and does not feel a real difference by the end of it gets a full refund. No shipping the pouches back. No forms to fill out justifying the decision. No conditions.

The window mirrors the 90 days that the cohort study covered — the same window in which the majority of participants saw meaningful movement in symptoms they had lived with for years.

Why Starting Sooner Matters

The state the fascia is in runs in one direction.

Every month the fascia goes without what it needs is more densification. Every layer of densification is a tighter squeeze on the nerves and the vessels supplying the fascia itself. Every tightening drops the water and nutrient flow further. Which produces more densification. More aching. More exhaustion and fog every morning. And less of the day left to live in.

That is what sits behind what patients describe as their baseline dropping — quietly, year over year — without anything they try interrupting it. The afternoon that used to be usable is gone by one. The ache that used to come and go now stays. The people who were told to give it six weeks are now five years in.

That is the direction this condition moves in when nothing stops it. Slowly, one month at a time — until one day the person looking back at it realizes how much of their life it took while they were busy waiting for it to resolve on its own.

The fascia today is the most responsive it will ever be. Every month it goes unaddressed, that changes.

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Important — Please Read

TrueForm® Is Not Sold on Amazon

TrueForm® is only available at tryfascial.com. If it shows up anywhere else, it isn’t the real thing. Here’s what’s going on:

  • Scammers have listed fake “TrueForm® supplements” on Amazon copying the name and logo.
  • These counterfeits are made in China and don’t contain the actual TrueForm® ingredients.
  • Many are never shipped at all — buyers are charged and receive nothing.
  • Unfortunately, real customers have already been scammed this way.
  • Fascial Labs is actively working to get these listings removed.

The genuine, USA-made TrueForm® is sold in one place only: tryfascial.com

From People Who Had Stopped Expecting Anything to Move

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Verified purchases · 4.9 / 5 average rating
Karen M.
Karen M.
★★★★★
Three years after the flu, I finally feel like me
08/02/2026
✔ Verified Purchase
I got the flu in January 2023 and never got better. My doctor said six weeks, then three months, then told me it was probably depression. The exhaustion was the worst part, and the fog. I would lose the word in the middle of a sentence at work. I tried a walking program that put me in bed for a week, and LDN which helped a little.

This is the first thing that made sense to me and the first thing that worked. It took about five weeks. The aching went first, then my head cleared. I'm back to working full days and I'm sharp in meetings again. I wish someone had told me the name of this three years ago.
Denise R.
Denise R.
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My lungs were "fine" and I couldn't do the stairs
07/26/2026
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Pneumonia in the fall of 2024. The follow up X-ray was clear and the pulmonologist signed me off. But my whole body ached like I still had it, and I was so exhausted by the afternoon I couldn't function. They put me on an antidepressant, which did nothing for the aching, and told me to rest, which did nothing.

Someone in a post-viral group posted this article. The part about the tissue drying out during the infection and never getting the signal to stop was exactly what it felt like. I'm about ten weeks in. The aching is mostly gone, I can do the stairs, and I'm not wiped out by two anymore. My husband noticed before I did.
Michael T.
Michael T.
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Mono at 34. Everyone said three weeks.
08/11/2026
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I got mono at 34, which apparently is unusual, and four years later I was still exhausted with muscles that burned after a short walk. My EBV numbers were "past infection." I did valacyclovir for months and a stack of about fifteen supplements. Nothing changed the baseline.

I was skeptical about this but the explanation was the first one that fit the fact that the virus was gone and I still felt like I had it. Took about six weeks. The burning in my legs is gone, I have energy through the whole day, and I did a real hike last weekend and felt fine the next day. First time in four years.
Limited Supply

Practitioner allocation first

The last thing worth knowing is that TrueForm® is not always in stock.

It is manufactured in small clinical batches in an FDA-registered, GMP-certified facility in the US. A portion of every batch is reserved for the 500+ physicians and clinicians distributing it within their practices. Whatever remains is released to the public, first-come, first-served.

When a batch sells out, the next one takes six to eight weeks to produce, and customers already on the protocol are placed ahead of new customers for restocks.

But if TrueForm® is in stock, this is an invitation to join the thousands of people who are already on it — people who had stopped waiting for the exhaustion, the aching, and the fog to resolve on their own, and started addressing the tissue instead.

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