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What the science says about peptides, without the hype.

The free daily newsletter to learn what peptides do, see real results, and know what's actually been tested.

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  • We read the studies behind every email
  • Every claim labeled and sourced
staateWed, Oct 14 New

Can a peptide help a sore knee heal faster?

5-minute read

By the numbers

5 Small studies in people have tested it so far. Small human studies
35 Animal studies of injury healing counted in one review. Animal or lab only
120 People a registry says the new hamstring trial will enroll. Official record

52 peptides and related compounds. Tap one to look it up.

Here's what lands in your inbox every morning.

The same five parts every day, so you always know where to look. It takes about five minutes to read. Below is the real issue from Wed, Oct 14.

staateto me Wed, Oct 14

Can a peptide help a sore knee heal faster?

Morning

If you have a knee that still aches from an old injury, today's main story is for you.

The main story

Short answer: In rats, clearly: a cut tendon healed faster and held more weight. In people, one clinic's handful of knee patients said it helped, and the first injury trials are now being set up.

Small human studies

The good news

Kids on a once-weekly growth hormone shot kept growing for four years.

Small human studies

The roundup

  • FDA approved a semaglutide shot for adults with fatty liver disease and liver scarring. Official record
  • MOTS-c, a peptide the body makes, protected eye blood vessels in diabetic mice. Animal or lab only

Your turn

What would you like me to explain next?

4 answers, one tap each. Vote on this one below.

  1. MorningA few lines on today’s topic and the most interesting result in it.A few lines to start the day.
  2. The main storyOne question answered start to finish: what it is, what people use it for and what the studies found.One question, answered start to finish.
  3. The good newsOne encouraging new result, like an approval or a trial that worked, with what happens next.One encouraging new result.
  4. The roundupNew studies in a sentence each, each one labeled by what it was tested in.New studies, a sentence each, labeled.
  5. Your turnA one-tap poll. The results go at the top of the next morning’s email.A one-tap poll on what comes next.

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Pick what you care about.

Not sure? Try the peptide finder

Each page lists the peptides for that goal. Having a human study means someone tested it in people, not that it works.

Every peptide is rated by its evidence.

We read the studies, not press releases or forum threads, and every claim links to its source. You will see these four ratings across the site.

  • Strong human evidenceAn approved drug, or tested in several large human trials.
  • Some human studiesTested in at least one proper human trial.
  • Early human dataOnly small human studies so far.
  • Animal studies onlyOnly tested in animals or cells so far.

Written in plain English for people with no science background. Nothing here is dosing advice.

Online: Copper peptide creams are clinically proven to reduce wrinkles.

The studies: The early cream results were never checked by other scientists. The one proper test on skin found no real difference.

GHK-Cu overall: Some human studies

See everything on GHK-Cu

Look up any peptide.

Of 52 peptides, 13 have strong human evidence, 16 have some human studies, 11 have early human data and 12 have only been tested in animals.

  • Strong human evidence13
  • Some human studies16
  • Early human data11
  • Animal studies only12
  • Banned in sport

Open the full database

New to peptides? Start here.

All 8 guides
A woman in her fifties reading on a tablet at her kitchen table What are peptides? What a peptide is, how it differs from collagen powder and from a drug, and why most are injected. Start here if you have never read about peptides before. Read the guide
  1. How to read peptide research Mouse studies, small trials and big trials, and how much each one counts.
  2. Side effects and red flags Which side effects are common and which mean call a doctor.
  3. Legal status in the US What FDA-approved, compounded and research-only actually mean.
  4. The weight-loss shots, explained Semaglutide, tirzepatide and the newer weight-loss shots, trial by trial.

Common questions, answered.

Vote on what we explain next.

What would you like me to explain next?

This is the poll from the Wed, Oct 14 email. One tap, no sign-up needed, and the results go at the top of tomorrow's email.

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What the FDA has done on peptides in 2026.

Full legal-status guide

  1. FDA moves against mass-made copies of weight-loss shots

    Pharmacies were allowed to make copies of semaglutide and tirzepatide during the shortages. Those ended in 2025, and the FDA said it would act against the mass-marketed versions.

    Source: FDA announcement Read the weight-loss shot guide

  2. Five peptides come off the FDA safety-concern list

    BPC-157, TB-500, CJC-1295, KPV and MOTS-c left the FDA list of risky ingredients. They are still not approved, so US pharmacies cannot make them.

    Source: FDA compounding list Read the legal-status guide

  3. FDA advisers back a popular injury peptide

    The panel voted 8 to 6 for BPC-157, the peptide studied for injuries. The FDA itself has not decided yet.

    Source: FDA advisory committee What the vote changes

Save peptides and keep private notes.

  • Saved peptidesKeep a short list and sort it by how well each was tested.
  • A private logNotes and numbers over time, on a chart. Only you can see it.
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One email each morning, and it is free. Every email has a one-click unsubscribe link at the bottom.

Who writes it?

We read the studies and write every email in plain English. Each claim links to the study or agency page it came from.

Can I ask you a question?

Yes. Hit reply on any email and ask. If enough readers ask the same thing, it becomes the main story.

Is this medical advice?

No. Staate explains published research for education. Decisions about starting, stopping or dosing any drug belong with a licensed clinician who knows your history.