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Safety

Are peptides safe?

Written by Reviewed 27 Sep 2026

It depends on the peptide. Approved drugs like semaglutide have large safety records. Research chemicals like BPC-157 have little or no human safety data. Semaglutide and tesamorelin are FDA approved with large safety databases; BPC-157 and TB-500 are unapproved research chemicals with little to no published human safety data at any dose. Whether a given peptide is safe depends on the specific compound, and this site's compound pages state exactly how much human evidence exists for each one, including when the honest answer is not much.

See the count for every compoundSide effects, by class

All 453 compounds, by what is known in people

Counted from each compound's US status and the finished studies in people on its page. A study only tells you about safety for the people, doses and length of time it covered.

83approved medicines in the USSafety was checked in the studies behind the approval, and is printed on the label.9available on prescription without full approvalMade by pharmacies or prescribed. A pharmacy copy is not the approved product.185not approved, but studied in people at least onceSome results in people, usually small and short.103not approved, and never studied in peopleNo published safety results in people. Check what users report on each page.73sold in the US as supplements or cosmeticsNot checked as drugs. Quality varies from brand to brand.

The compounds people ask about first

A starting list, in no particular order. The rating counts the studies in people on each page, and each page lists the side effects people reported.

CompoundMeasured in peopleUS statusLegal detail
SemaglutideStrong. At least two completed trials, and at least 1,000 people given it. 12 completed trials, 42,363 people given it.12 completed trials, 42,363 people given itApproved medicineIs it legal?
TirzepatideStrong. At least two completed trials, and at least 1,000 people given it. 9 completed trials, 22,802 people given it.9 completed trials, 22,802 people given itApproved medicineIs it legal?
RetatrutideStrong. At least two completed trials, and at least 1,000 people given it. 5 completed trials, 1,345 people given it.5 completed trials, 1,345 people given itInvestigationalIs it legal?
BPC-157Limited. Someone has been given it and a result was published, but fewer than 100 people. 3 completed trials, 31 people given it.3 completed trials, 31 people given itNot approvedIs it legal?
TB-500Preliminary. Studied in people, but no published study has given it to anyone. 1 registered with no result.1 registered with no resultNot approvedIs it legal?
GHK-CuLimited. Someone has been given it and a result was published, but fewer than 100 people. 2 completed trials, 99 people given it.2 completed trials, 99 people given itSupplement or cosmeticIs it legal?
CJC-1295Limited. Someone has been given it and a result was published, but fewer than 100 people. 2 completed trials, none stating how many people.2 completed trials, none stating how many peopleNot approvedIs it legal?
IpamorelinModerate. At least one completed trial, and at least 100 people given it. 2 completed trials, 157 people given it.2 completed trials, 157 people given itNot approvedIs it legal?
TesamorelinStrong. At least two completed trials, and at least 1,000 people given it. 8 completed trials, 1,729 people given it.8 completed trials, 1,729 people given itApproved medicineIs it legal?
MK-677Limited. Someone has been given it and a result was published, but fewer than 100 people. 2 completed trials, 65 people given it.2 completed trials, 65 people given itNot approvedIs it legal?
EpitalonModerate. At least one completed trial, and at least 100 people given it. 5 completed trials, 266 people given it.5 completed trials, 266 people given itNot approvedIs it legal?
MOTS-cLimited. Someone has been given it and a result was published, but fewer than 100 people. 1 completed trial, 30 people given it.1 completed trial, 30 people given itNot approvedIs it legal?

Where the risk sits

Side effects, by classA class-by-class table separating adverse events recorded in controlled trials and FDA labels (GLP-1 drugs, MK-677, elamipretide, bremelanotide) from the anecdotal reports that fill forums for BPC-157, TB-500, copper peptides and nootropic peptides.Read Legal status by countryWhether each compound is legal in four countries, plus sport and military rules.Read What is FDA-approvedEvery approved compound in the archive, generated from the profiles.Read The FDA's 2026 peptide decisionsA dated tracker of where BPC-157, TB-500, KPV, MOTS-c, Epitalon, Semax and DSIP stand with the FDA after the April 2026 list change and the July 23 to 24 advisory committee votes, with links to every source document.Read Reading a certificate of analysisWhat each field on a peptide COA means, what a purity percentage does and does not tell you, how to verify a Janoshik report, and the red flags the FDA's own 2026 review found in market products. No vendor recommendations.Read Every seller, gradedWho is behind each storefront and what certificate it publishes.Read Injecting, sourcedWhere to inject, which needles, moving the spot, and keeping it clean.Read How to mix a vialWhich water, how to mix, how long it keeps, and what odd-looking powder means.Read Get a vial testedWhat labs charge, and how to send in your own vial.Read

Questions people type

Is it safe to use peptides?

It depends on the peptide. Approved drugs like semaglutide have large safety records. Research chemicals like BPC-157 have little or no human safety data. Semaglutide and tesamorelin are FDA approved with large safety databases; BPC-157 and TB-500 are unapproved research chemicals with little to no published human safety data at any dose. Whether a given peptide is safe depends on the specific compound, and this site's compound pages state exactly how much human evidence exists for each one, including when the honest answer is not much.

What does 'research use only' mean?

It means a compound has not been approved by regulators for human use and is intended for laboratory research. Many peptides carry this status. It is a legal and regulatory label, and this site presents it as information, not as encouragement.

Are peptides illegal?

There is no single national rule that makes peptides, as a category, illegal. This site's legal-status fields are national and compound-specific: US, UK, Australia, and Canada. Some peptides are approved prescription medicines (semaglutide, tirzepatide, tesamorelin, PT-141 as Vyleesi). Many others are listed not approved, research use only. Research-use-only is a regulatory label, not a criminal code and not a permission to take the vial. Selling an unapproved article as a drug for human use is a different legal question from the national field on /legal. This dataset has not filled any US state, UK county, or Canadian province. This FAQ does not invent a ban and does not invent a state statute. Compound pages: /legal.

Is it legal to import peptides into the US?

This site does not hold a US import classification. Legal-status fields record national approval or research-use status. They do not record customs rules, personal-importation allowances, or whether a parcel labeled research use only may cross a border. Import is a different legal question from the US field on /legal. This FAQ will not fill that gap with a guess, and it does not invent a state or port rule. Check the compound's US legal page for the national status this site actually stores.

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.