Look for third-party testing and Certificates of Analysis (COAs) Avoid vendors that dont list ingredients, batch info, or offer transparency Be cautious with unusually cheap or high-concentration vials Low-quality peptides may contain contaminants, incorrect amino acid sequences, or bacterial endotoxinsall of which can provoke immune reactions or reduce efficacy
Both have strong safety profiles
Zuo et al., TB-500 and its degradation product, Ac-SDKP, are novel reparative factors in renal fibrosis, Kidney Int., 84(6), 2013
When youre talking about peptides being promoted online, those health claims have not been vetted by any expert group, the FDA, or anyone else