Peptide vs steroid: the chemistry
Peptides and steroids belong to different chemical classes: one is built from amino acids, the other from a hydrocarbon ring system.
| Peptide | Steroid | |
|---|---|---|
| Definition | Amides formed from two or more amino acids, with loss of water[1] | Compounds based on the cyclopenta[a]phenanthrene carbon skeleton, partly or fully hydrogenated[2] |
| Backbone | A chain of amino acid residues joined by peptide bonds | Four fused rings; the bare parent ring system is called gonane[3] |
| Example | BPC-157: 15 amino acids, C62H98N16O22[5] | Testosterone: C19H28O2, 288.4 g/mol[4] |
| Contains nitrogen? | Yes, in every residue | Not in testosterone |
| Class | Peptide (or protein above 40 residues in U.S. drug law) | Lipid |
The confusion is understandable: some peptides are sold for muscle or "recovery", the same claims made for steroids. But a peptide that prompts the pituitary to release growth hormone and an anabolic steroid, defined in U.S. law as a substance "chemically and pharmacologically related to testosterone", are different molecules acting in different ways.[7] See what are peptides and what is a peptide bond.
Peptides vs steroids under U.S. law
Anabolic steroids are federal Schedule III controlled substances; peptides such as BPC-157 are regulated as drugs by the FDA but are not controlled substances.
- Anabolic steroids. 21 CFR 1308.13(f) places "any substance meeting the definition of anabolic steroid" in Schedule III, and the list includes testosterone.[6] The DEA defines an anabolic steroid as a drug or hormonal substance "chemically and pharmacologically related to testosterone".[7]
- Peptides. The DEA's alphabetical list of controlled substances (November 12, 2026) has no entry for BPC-157, tesamorelin, ipamorelin, sermorelin, bremelanotide, thymosin, GHK or CJC-1295.[8] These are handled under drug law: unapproved peptides sold for human use are unapproved drugs, and several sit on FDA compounding safety lists.[12]
- Human growth hormone is a protein, not a steroid, and is not on the DEA list either. Its distribution is restricted by a separate law: knowingly distributing it "for any use in humans other than the treatment of a disease or other recognized medical condition" authorized by HHS and ordered by a physician is a federal offense, and the DEA may investigate.[9][8]
Not legal adviceThis summarizes federal rules as of November 13, 2026. State laws can add their own rules. For the FDA side of peptide legality, see are peptides legal?
Peptides vs steroids in sport
WADA puts anabolic steroids and peptide hormones in different sections of its Prohibited List, and both are banned at all times.[10]
| Section | Covers | Examples |
|---|---|---|
| S0 Non-approved substances | Substances with no current approval for human therapeutic use | BPC-157[11] |
| S1 Anabolic agents | Anabolic androgenic steroids and other anabolic agents | Testosterone, nandrolone, stanozolol |
| S2 Peptide hormones, growth factors | Peptide hormones, growth factors and mimetics | Tesamorelin, sermorelin, CJC-1295, ipamorelin, TB-500 |
WADA's FAQ adds that S2 peptides and growth factors in cosmetic creams are prohibited regardless of route.[10] More on the peptides banned in sports page.
Do peptides act like steroids?
Some peptides affect the same systems people use steroids for, but by a different route: growth-hormone-releasing peptides prompt the pituitary to release the body's own growth hormone, while anabolic steroids are testosterone-related hormones themselves. Among the peptides on this site, none is an anabolic steroid, and the only ones with FDA approvals are for specific medical uses, such as tesamorelin for HIV-associated abdominal fat. The HGH peptides page compares those that act on growth hormone.
Frequently asked questions
Is BPC-157 a steroid?
Is HGH a steroid?
No. Human growth hormone is a protein. It is not a scheduled controlled substance, but its distribution outside approved medical use is a federal offense under 21 U.S.C. 333(e).[9]
Are peptides controlled substances?
The peptides discussed on this site do not appear on the DEA's controlled substances list.[8] That does not make unapproved ones legal to sell for human use; see are peptides legal?
Will peptides show up as steroids on a drug test?
Anti-doping tests look for specific substances, and WADA lists peptides and steroids in separate sections. Many peptides are prohibited in their own right.[10]
Sources
- IUPAC glossary of class names (1995): peptides, polypeptides, proteins
- IUPAC glossary of class names (1995): steroids
- IUPAC-IUB JCBN: The nomenclature of steroids, 3S-1.0 and 3S-2.1 (gonane)
- PubChem CID 6013: testosterone
- PubChem CID 9941957: BPC-157
- 21 CFR 1308.13(f): Schedule III anabolic steroids
- 21 CFR 1300.01: DEA definition of "anabolic steroid"
- Controlled substances, alphabetical order
- 21 U.S.C. 333(e): prohibited distribution of human growth hormone
- The Prohibited List (2026, online version and FAQ)
- World Anti-Doping Code: Prohibited List 2026
- Certain bulk drug substances for use in compounding that may present significant safety risks