Peptides are not steroids. A peptide is a short chain of amino acids joined by peptide bonds; an anabolic steroid is a four-ring lipid built on the steroid nucleus. They are unrelated chemical classes, and their legal status differs accordingly: anabolic steroids are Schedule III controlled substances in the United States, while peptides are not scheduled. Aegis Bio supplies research peptides and does not supply controlled substances of any kind.
Key facts
- A peptide is a chain of amino acids — typically a few to a few dozen residues, joined by peptide bonds.
- An anabolic steroid is a lipid built on a fused four-ring carbon skeleton. There are no amino acids in it.
- Anabolic steroids are Schedule III under the Controlled Substances Act. Peptides are not scheduled.
- Aegis Bio does not supply anabolic steroids or any other controlled substance.
- Everything in this catalog is supplied for in-vitro laboratory research only and is not for human or veterinary use.
The chemistry
The two classes are built differently from the first atom.
| Attribute | Peptides | Anabolic steroids |
|---|---|---|
| Building block | Amino acids | Fused four-ring steroid nucleus |
| Bond type | Peptide (amide) bonds | Carbon–carbon ring system |
| Typical size | Roughly 300 to 5,000 g/mol | Roughly 250 to 450 g/mol |
| Solubility | Generally water soluble | Lipophilic |
| Stability in water | Hydrolyses; supplied lyophilised | Stable |
| US legal status | Not scheduled | Schedule III controlled substances |
| Sold by Aegis Bio | Yes, for in-vitro research use only | No |
The practical consequence of that last chemistry row is the one buyers meet first: because peptide bonds hydrolyse in water, research peptides are supplied as a lyophilised cake rather than a solution, and are reconstituted immediately before laboratory work. Steroids have no equivalent constraint.
Why the two get confused
Three reasons, none of them chemical.
- Shared vocabulary. Both are discussed in the same online spaces, using the same informal language, which flattens two unrelated classes into one category in ordinary speech.
- Both are unapproved in this context. Many research peptides have no FDA approval, and anabolic steroid products are controlled. Two different reasons for restriction get read as one shared status.
- Retail framing. Vendors that market both under a single banner train the association, even though the compliance position for each is completely different.
Regulation is the difference that actually matters
Scheduling under the Controlled Substances Act is a specific legal designation attached to a specific list of substances. Anabolic steroids are on that list. Peptides are not, which is why peptide reagents are supplied to laboratories the way other characterised reagents are — with a certificate of analysis, a lot number and no claims — while controlled substances cannot be.
That is not a statement that research peptides are unregulated. They are supplied under a research-use-only designation, which carries its own boundaries: not for human or veterinary use, no health or efficacy claims, and no guidance on administration. What that designation covers is set out on the compliance page and in are peptides legal.
What Aegis Bio supplies
Research peptides as lyophilised powder, in single vials and 10-vial kits, with a certificate of analysis available by request for the batch shipped. Representative entries include Retatrutide, Tirzepatide, BPC-157, GHK-Cu and TB-500. There are no controlled substances in the catalog and none will be added. Certificates are listed in the certificate library, ordering detail is on the FAQ, live offers are on the sale page, and checkout data handling is described in the privacy policy.
All materials are supplied for in-vitro laboratory research use only and are not for human or veterinary use. Nothing here is a therapeutic claim.