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If your test is negative, you dont have either of these two MTHFR gene mutations

Studies measuring copper levels in users of GHK-Cu products have not shown clinically significant increases in systemic copper, and there are no reports of copper toxicity from GHK-Cu cosmetic use

Thats because products vary (a lot) when it comes to the types and the amounts of nutrients they offerand many products fall short

doi:10.1186/s12951-018-0392-8

Kim SJ, Lee MY, Kwon do Y, Kim SY, Kim YC

SUPERIOR GHK-CU PEPTIDES LIQUID 6X BETTER ABSORPTION: Our GHK-Cu peptides oral supplement drops feature smaller, pre-digested peptides for faster absorption and easier digestion