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Vitamin C serves as a cofactor for collagen synthesis
Chen, W
Cysteine is often the most important, as it contains sulfur and is frequently the "limiting factor" in how much glutathione your body can create
the solution should be clear and colorless (or slightly pale yellow)
The theory is that this keeps your body sensitive to the peptide and helps you lock in your progress, though this hasn't been proven
Paired with salicylic acid, it tightens pores, clears congestion, and reduces their appearance
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