Myth or fact?
Common claims about peptides, and what the evidence says.
1. BPC-157 is an FDA-approved medicine for muscle and joint injuries.
Myth
BPC-157 is not approved by the FDA or any other regulator. Nearly all the evidence comes from rats. A 2026 FDA advisory panel vote about compounding is not an approval, and FDA has not made a final decision.
Reference: FDA, Certain bulk drug substances that may present significant safety risks (2026); FDA BPC-157 briefing document (July 2026)
2. BPC-157 and TB-500 are banned in all WADA-tested sports.
Fact
WADA prohibits BPC-157 under S0 (non-approved substances) and TB-500 under S2 (growth factors), both at all times. A first violation for these substances carries a default ban of up to four years.
Reference: WADA 2026 Prohibited List; USADA athlete advisories (2018, 2022)
3. Oral BPC-157 has been proven to work in people.
Myth
Lab tests by BPC-157's developers suggest it survives stomach juice, and it worked by mouth in rats. No human study shows that oral BPC-157 is absorbed or works.
Reference: Sikiric et al., Gut and Liver 2020; FDA BPC-157 briefing document (July 2026)
4. Semaglutide and tirzepatide work on exactly the same hormone pathway.
Myth
Semaglutide acts on the GLP-1 receptor only. Tirzepatide acts on both GLP-1 and GIP receptors. In the SURPASS-2 trial (type 2 diabetes), tirzepatide lowered blood sugar and weight more than semaglutide 1 mg.
Reference: Frías et al., SURPASS-2, NEJM 2021; 385:503-515
5. A lab certificate showing high HPLC purity proves a peptide is safe.
Myth
HPLC and mass spectrometry check purity and identity. They do not show a product is sterile, free of endotoxin, correctly dosed, safe or legal. In a 2024 study, peptides bought online claiming 99% purity failed on several of these.
Reference: Ashraf et al., J Med Internet Res 2024 (doi:10.2196/65440); FDA guidance on synthetic peptide impurities (2021)
Read more
BPC-157 Not approved
A lab-made chain of 15 amino acids, based on part of a protein first found in human stomach juice.
TB-500 (thymosin beta-4 fragment) Not approved
A short lab-made piece (7 amino acids, Ac-LKKTETQ) of the natural protein thymosin beta-4. It is not the full protein.
Semaglutide Approved
A GLP-1 receptor agonist: a copy of the gut hormone GLP-1 with a fatty-acid side chain that makes it last about a week.
Tirzepatide Approved
Acts on two gut-hormone receptors: GLP-1 and GIP.
Retatrutide In trials
An experimental drug that acts on three hormone receptors: GLP-1, GIP and glucagon.
GHK-Cu Cosmetic ingredient, not a medicine
A tiny peptide of three amino acids bound to copper, found naturally in blood. First described by Dr Loren Pickart in 1973.