Sourcing is the #1 variable.
Almost every avoidable problem with peptides traces back to one of four things: bad sourcing, bad storage, stacking too many things at once, or skipping medical supervision for a condition that needed it.
Sourcing
Research-grade peptides vary enormously in purity. Look for vendors that publish third-party HPLC and mass-spec results, name their lots, and respond when you ask. If they won't share a certificate of analysis, walk away.
Storage and reconstitution
Peptides ship lyophilized (freeze-dried). Use bacteriostatic water to reconstitute. Store the reconstituted vial refrigerated and use within a few weeks. Avoid freeze-thaw cycles — they destroy peptide integrity.
Start low, introduce one at a time
Begin at the low end of the published dose range. Introduce one new peptide at a time — adding two at once makes side-effect attribution impossible. Keep notes: dose, time, response.
When to talk to a clinician
History of cancer, autoimmunity, pregnancy, cardiovascular disease, or any transplant — this category needs a clinician familiar with peptides. Telehealth clinics in this space have multiplied; quality varies, vet carefully.
Red flags
- No certificate of analysis on request
- Unusual or rapidly-shifting branding
- Prices dramatically below market average
- Vendor will not name the lot or batch
- Reconstituted solution is cloudy, off-color, or smells off
PepVault is an educational reference. Many peptides discussed here are research compounds. We don't recommend doses, sources, or protocols — that's your homework with a qualified clinician.
Read the safety guideFrequently asked questions
- Sourcing. Research-grade peptide purity varies enormously. Use vendors that publish third-party HPLC and mass-spec results, name their lots, and respond to questions. If they won't share a certificate of analysis, walk away.