Is B7-33 legal?
B7-33 is not FDA approved as a finished drug. For drug-tested athletes it is not on the WADA prohibited list. Not prescribed in conventional medicine.. Legal status depends on your country and changes over time. This reflects US status at the time of writing and is not legal or medical advice.
Regulatory status
- FDA: Not FDA approved. Pre-clinical research compound.
- WADA: Not listed
- Prescription: Not prescribed in conventional medicine.
References
- B7-33, single-chain peptide derivative of relaxin retains anti-fibrotic activity without hemodynamic effects — Hossain MA et al., Chem Sci, 2016
- B7-33 replicates the vasoprotective functions of human relaxin-2 (serelaxin) — Marshall SA, O'Sullivan K, Ng HH, et al., European Journal of Pharmacology, 2017
- Single chain peptide agonists of relaxin receptors — Praveen P, Kocan M, Valkovic A, et al., Molecular and Cellular Endocrinology, 2019
Pepdex is an editorial reference, not medical advice. Peptides vary in legal and approval status by country, many are research compounds without full human safety data. Talk to a qualified clinician before starting anything.
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Last updated 2026-06-06.