doing two different peptides back to back is where mistakes happen, mixing up the mg/ml between vials is way easier than people think. Research Labs posts batch-specific COAs per order so you can actually check purity against the vial before reconstituting instead of just trusting the label.
Reconstitute 2 Peptides into a Pen Cartridge
Glen Willits
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In this video I show how to reconstitute two separate peptides, and filter and combine them into a single pen cartridge.