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Both routes exist, and the right choice depends on your goal

Regenerative processes like collagen remodeling take time, so consistency and realistic timelines matter more than quick fixes

Eur J Cancer 34(12):18715 Zhou S, Yung Chan S, Cher Goh B, Chan E, Duan W, Huang M, McLeod HL (2005) Mechanism-based inhibition of cytochrome P450 3A4 by therapeutic drugs

Most people will notice improvements within about 3 months of daily use of a GHK-Cu serum

Peptides Peptides are short chains of amino acids that play important roles in normal human physiology, including signaling pathways involved in metabolism, hormone regulation, and tissue function