How the PeptScore is calculated

Every vendor gets a single PeptScore from 0 to 100, mapped to a 0–5 star rating and a trust tier. It is a weighted average of trust factors, with serious red flags capping the score.

Trust tiers

Excellent

85–100

Great

70+

Average

55+

Poor

40+

Bad

Lab/COA integrity

45%

Third-party COA verified

Independent lab (e.g. Janoshik) verifies the Certificate of Analysis. The single strongest trust signal.

20%

HPLC purity

Average tested purity %. 99%+ is excellent.

12%

COA available

Any Certificate of Analysis is provided to customers.

Accredited lab partner

Testing performed by an accredited (e.g. ISO 17025) lab.

Operational

25%

Domain age

Older domains are more established. 2+ years scores full.

Shipping speed

Average delivery time. ≤3 days excellent, ≥21 days poor.

Reship / guarantee policy

Vendor reships seized or lost packages.

Batch traceability

Products carry batch numbers traceable to COAs.

Payment methods

Card/escrow safer than crypto-only.

Reputation

30%

Community reputation

Reddit / forum sentiment (manual 0–100 for MVP).

15%

User reviews

Average approved user rating on Peptscore.

10%

Editorial verdict

Our own hands-on editorial assessment.

Red-flag overrides

Some issues are serious enough to cap the score regardless of other strengths. The lowest applicable cap always wins.

FDA raid / seizure reports / fake COACaps score at 15

Regulatory warningCaps score at 35

No COA availableCaps score at 40

Domain under 6 months oldCaps score at 50

Crypto-only payments−10 point penalty

Weights are reviewed and tuned by our editorial team and may be adjusted per market. This page reflects the current global default weighting.