Peptide Science Desk

How to tell if peptides are legit

A free checklist for any pharmacy, clinic, or website selling peptides.

Short answer: A legit source of peptide medicine is a state-licensed pharmacy. It needs a prescription, lists a US address and phone, and has a pharmacist you can talk to. A seller that labels peptides "research use only" or "not for human consumption" is not selling medicine for people. Answer the questions below to get a plain result.

By the Peptide Science Desk Editorial TeamFact-checked against FDA and official sources · Not yet reviewed by a licensed clinician. How we check facts

Nothing you click is saved or sent. This tool does not name or rank any company. We never link research-peptide sellers or labs.

The seller

Does it need a prescription from a licensed prescriber?

FDA BeSafeRx: a safe online pharmacy always needs a prescription.

Did you find its license with a state board of pharmacy?

Check your state, and the state it ships from.

Look it up: State board of pharmacy license lookups (FDA list)NABP: contact your state board of pharmacy

Does it list a real US street address and phone number?

BeSafeRx lists both as safe signs.

Can you talk to a licensed pharmacist there?

BeSafeRx says a safe pharmacy has one to answer questions.

Does the website pass NABP’s Safe Site Search?

Type the web address into the free tool.

Look it up: NABP Safe.Pharmacy: Safe Site Search

If it calls itself a 503B outsourcing facility, is it on the FDA list?

503B sites register with the FDA and get FDA inspections.

Look it up: FDA list of registered 503B outsourcing facilities

Has the FDA sent it a warning letter?

Search its name on fda.gov.

Look it up: FDA warning letters searchOur FDA peptide warning letters tracker

The product

Is it labeled "research use only" or "not for human consumption"?

The FDA has warned sellers who use these labels but sell to people.

Does it sell "research" peptides with mixing water, syringes, or dosing tips?

The FDA has pointed to sales like these as signs a "research" product is meant for people.

Look it up: Our FDA peptide warning letters tracker

Does it ship from another country?

BeSafeRx calls this a warning sign.

Are prices far lower than everywhere else?

BeSafeRx: prices that seem too good to be true are a warning sign.

Did it arrive warm, damaged, in a foreign language, or with no expiration date?

BeSafeRx and the FDA list these as warning signs.

Is a lab report (COA) from the seller the only proof of quality?

A COA does not prove a shot is sterile or safe for people.

Look it up: What a lab report (COA) can and cannot prove

Your result shows here

Answer the questions above. You can skip any you do not know yet.

A bright FDA science lab with benches and equipment
A lab inside FDA Building 64 (2004 photo).Photo: U.S. Food and Drug Administration, public domain

How to know if a peptide company is legit

Use these free, official lookups. They work for any pharmacy or seller.

The numbers in charts

How many online pharmacies follow US law?

About 35,000 online pharmacies are active at any time

Only about 5 in 100 follow US pharmacy laws and standards.

Show the numbers as a table
How many online pharmacies follow US law?
Online pharmaciesFollow US pharmacy lawsDo notTotal
Out of every 100 online pharmacies5%95%100%
The FDA cites these numbers from NABP. "Research use only" peptide sellers are not pharmacies at all. Sources: FDA BeSafeRx: Frequently asked questions.

Do supplement labels tell the truth? Melatonin gummies

25 melatonin gummy products bought in the US and tested in a lab

22 of 25 (88%) did not match their label. Peptides sold online are checked even less.

Show the numbers as a table
Do supplement labels tell the truth? Melatonin gummies
ProductsWithin 10% of the labelWrong amount (more or less)Total
25 products tested32225
This study tested melatonin, not peptides. We show it because no similar US study of peptide products exists yet. Sources: Cohen et al., JAMA 2023 (PMID 37097362).

How to tell if peptides are real or fake

Sellers often show a COA (certificate of analysis). It is a lab report for one batch. Each test answers a different question:

Test on the COAWhat it can showWhat it cannot show
PurityHow much of the powder is the main ingredient.Whether it is free of germs, or how much is in each vial.
IdentityWhether the molecule matches the name on the label.Whether it is pure, clean, or the right amount.
Strength (amount)How much is in the vial.Whether it is free of germs.
SterilityWhether live germs grew in a lab test.Bits of dead bacteria (endotoxins) that can cause fever. That is a separate test.
EndotoxinBits of bacteria that can cause fever.Live germs, purity, or identity.

So a "99% pure" COA does not prove a shot is sterile, the right dose, or safe for people. USP says pharmacies setting use-by dates for sterile shots must think about tests for sterility, endotoxins, sealed containers, and particles.

A COA covers one batch. Check that its batch (lot) number matches your vial. Even real drug makers cannot rely on a supplier’s report alone. FDA rules say they must run at least one identity test themselves.

"Research use only" means not for people, even with a perfect COA.

Are peptides legit?

Some are real, FDA-approved medicines, like Wegovy and Zepbound. Others are made by licensed pharmacies under strict rules. Many sold online are neither.

"Not FDA approved" does not always mean illegal. It depends on the product and how it is made and sold. But the FDA says products falsely sold "for research purposes" are of unknown quality and may be harmful.

Are peptides legal in the US?

Where can I get peptides tested for purity?

We do not name, rank, or link testing labs or sellers.

A test of one vial tells you about that vial only. It cannot make a "research use only" product safe or legal to inject. The safest path is an approved medicine, or one made for you by a licensed pharmacy, with a prescription.

Can a doctor prescribe peptides?

FAQ

Does this tool check a specific company?

No. This tool does not name or rank any company, and we never link research-peptide sellers or labs. Use the official lookups on this page for any company you are checking. For licensed GLP-1 telehealth services, see our GLP-1 provider comparison, which shows public records only.

Is my answer saved or sent anywhere?

No. The checklist runs in your browser. Nothing you click is saved or sent to us.

A seller has great reviews. Is that enough?

No. The FDA says unsafe sites often use fake "storefronts" to look like licensed pharmacies. Reviews can be faked too.

How many online pharmacies follow the rules?

The FDA, citing NABP, says there are about 35,000 active online pharmacies at any time, and only about 5% follow US pharmacy laws and standards.

What if I already used a product and feel sick?

Get medical help. Then tell your doctor what you used, and report it to FDA MedWatch.

Does "made in the USA" make a peptide legit?

No. Where it is made does not tell you if it is licensed, sterile, or meant for people. Use the checklist above.

Are Black Friday or Thanksgiving Ozempic, Wegovy or peptide "deals" safe?

Treat big holiday discounts like any other online pharmacy check. FDA BeSafeRx says a safe online pharmacy always needs a prescription from a licensed prescriber, lists a real US address and phone, has a licensed pharmacist you can talk to, and is licensed by a state board of pharmacy. Warning signs include prices that seem too good to be true, shipping from another country, no prescription required, and packages that arrive warm, damaged, in a foreign language or with no expiration date. Unapproved "research" peptides and compounded copies of brand GLP-1s are not the same as FDA-approved Wegovy, Ozempic or Zepbound from a licensed pharmacy. Use the checklist above and the state-license lookups on this page. We never name or link holiday vendors.

Related pages

Sources

Checked October 20, 2026. Not medical or legal advice. Disclaimer · How we check facts