Peptide Library
Compares 209 peptides across 58 vendors by price per mg and calculates your dosing math.
Peptide Library is a free, no-account research tool: search 209 peptide profiles, compare live vendor offers by price per milligram rather than sticker price, and run reconstitution, dosing or multi-peptide blend calculations in the same flow. Vendor rankings are sorted by $/mg only — coupons or affiliate links don't change the order, by their own disclosure. The site is explicit that it doesn't sell peptides, and that everything on it is for research use only, not medical advice or human consumption.
What holds up
- +Ranks vendors by price per mg, not sticker price — a $44.99 10mg vial can beat a cheaper-looking $25 5mg one.
- +Coupons and affiliate links don't change the vendor ranking, by their own disclosure.
- +Free, in-browser, no account — reconstitution and dosing math run without signing up for anything.
Mind the limits
- −Explicitly not medical advice and not for human consumption — research only, no real dosing use.
- −Doesn't sell peptides itself — you still have to buy from one of the 58 listed vendors separately.
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