COMMON QUESTIONS.

A peptide is a short chain of amino acids — typically 2–50 residues — that functions as a biological signal in the body. Smaller than proteins, larger than amino acids. Many pharmaceutical peptides (semaglutide, tesamorelin, BPC-157) are modified or synthetic versions of naturally occurring sequences.

Peptides are polypeptide chains that act as signaling molecules — they modulate natural hormonal pathways. Steroids are lipid-based molecules that directly mimic endogenous hormones. Mechanism, structure, and side-effect profile differ significantly.

Safety depends entirely on the compound. FDA-approved peptides (semaglutide, tirzepatide, tesamorelin, PT-141) have extensive human safety data. Research-only compounds (BPC-157, TB-500, epithalon) rely primarily on animal data and limited human trials. Always consult a qualified physician and verify sourcing with a third-party COA.

Use our dosing calculator. Enter vial mass, diluent volume, and target dose — it returns the exact draw volume for a U-100 insulin syringe. Everything runs locally in your browser.

Add bacteriostatic water slowly to the side of the vial (never directly on the powder). Swirl gently — do not shake. Store refrigerated (2–8°C) and protect from light. Our reconstitution helper generates a full draw-volume chart.

Most peptides are stable ~28 days refrigerated after reconstitution, protected from light. Some compounds are more or less stable — always check the specific profile in our library.

U-100 insulin syringes are easier for most peptide dosing (1 mL = 100 units, so math is clean). Tuberculin is better for very small volumes (<0.1 mL) or when you need precision in 0.01 mL increments.

Most unapproved research peptides are sold under "for research use only" labeling in a legal gray zone. Legality and scheduling vary by country and compound. In September 2023 the FDA restricted certain compounds (including BPC-157) from 503A/B compounding. Always check current regulations in your jurisdiction.

Always request a Certificate of Analysis (COA) from the supplier. Third-party HPLC results should show ≥99% purity. Mass spec should confirm the correct molecular weight. Lot numbers should match between the vial and the COA.

We partner with PEAK LAB PEPTIDES as our vetted supplier — 12 consecutive batches passed independent HPLC at our labs. See our sourcing page for the full criteria we used.

Affiliate commission from PEAK LAB PEPTIDES purchases made through our links (disclosed). Nothing else. No ads, no data sales, no sponsored content.

No. Pepgains is strictly educational. Nothing on this site constitutes medical advice. Always consult a qualified physician before using any peptide.

Monthly at minimum; immediately when major trial data drops (e.g., TRIUMPH Phase 3 results). Every profile shows when it was last updated.

Yes — email hello@pepgains.com. We prioritize compounds with at least some published research.