Suitability and pricing can depend on the consultation and the service selected
Wang Y, Wang M, Yin S et al (2015) NeuroPep: a comprehensive resource of neuropeptides
Others prefer continuous low-dose approaches
Key quality indicators to look for include third-party testing with certificates of analysis (COA) showing purity above 98%, proper lyophilization (the powder should be a clean, white cake, not a yellow or clumpy mass), appropriate packaging (amber vials to protect from light degradation), and clear labeling including peptide identity, mass, lot number, and expiration date
Peptide Storage and Handling Guidelines. Aapptec
If it has been stored improperly or past the expiration date, it may also not work as well