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They can be affected easily by oxidative stress and need enough glutathione to do their job well

The shared biological properties of exendin-4 and human GLP-1 probably stem from their primary and secondary structures, but exendin-4 is naturally resistant to degradation by the DPP-4 enzyme, attributed to the presence of glycine at position 2, resulting in an intravenous half-life of approximately 30 minutes (85)

The actual amino acid sequence, the concentration per vial, and the sterility of the solution can vary between research suppliers and between batches from the same supplier

PMC 4888068

Q: Can I use copper peptides with retinol or acids