Source comparison
Thymosin Alpha-1: Peptide Purity Comparison
Research-grade supplier (503B facility) ≥98% (batch-tested) <2% truncated peptides, trace salts 28 days refrigerated Required standard. Anything below 98% purity produces inconsistent immune response Compounding pharmacy (non-503B) 90–95% (not always verified)
This comparison does not assign a generated winner or score.
- Research-grade supplier (503B facility)
- ≥98% (batch-tested)
- <2% truncated peptides, trace salts
- 28 days refrigerated
- Required standard. Anything below 98% purity produces inconsistent immune response
- Compounding pharmacy (non-503B)
- 90–95% (not always verified)
- Variable truncated sequences, residual solvents
- 14–21 days refrigerated
- Acceptable if HPLC certificate provided. Reject if purity not documented
- International grey-market peptide
- 70–85% (rarely tested)
- High truncated peptides, bacterial endotoxins, heavy metals
- Unpredictable. Often degrades within 7 days
- Reject entirely. Purity variability makes troubleshooting impossible
- Pharmaceutical-grade Tα1 (Zadaxin, Italy)
- ≥99% (regulatory verified)
- <1% process-related impurities
- 36 months lyophilised, 28 days reconstituted
- Gold standard. Expensive but eliminates purity as a failure variable