Do lyophilized peptides need to be protected from light?

Yes. Light, especially UV light, is one of the main things that breaks peptides down. Keep vials in their box or in a container you cannot see through. Heat, damp, air, and light are often called the four enemies of a peptide, and light is one of the easiest to control.

The whole guide to mixing peptides, step by step, in the order problems come up

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of storing unmixed (lyophilized) peptides. How to store the freeze-dried powder before you add any water.