P21 Purity: 5 Lab Tests Across 4 Vendors

63 studies on P21 curated from PubMed, ClinicalTrials.gov, and EuropePMC. Updated daily.

We tested 5 P21 batches across 4 manufacturers

Independent certificate-of-analysis evidence from third-party labs — the data behind the studies. Updated as new COAs are verified. Read the full grey-market analysis →

98.89%
Avg purity
5
Batches tested
4
Manufacturers
ManufacturerBatchesAvg purity
Modern Aminos 2 98.75% View COA →

Recent certificates: #64980 (99.3%) · #57930 (99.17%) · #55913 (98.36%) · #40642 (98.745%)

Vendors who tested P21

Manufacturers with published third-party certificates of analysis for P21. Open a vendor to see every batch we've verified.

Modern Aminos 2 COAs · 98.7% avg Amino Annex 1 COA · 99.3% avg TrueLab Peptides 1 COA · 99.2% avg Suaway Lab Research 1 COA · 98.4% avg

Research tools

Free, no account — handy when you're working with P21.

Reconstitution calculator Bac water, concentration & insulin-unit math Verify a COA Look up a report number against our corpus