ghk cu peptide 50mg GHK-Cu Lyophilised Solid Research Grade GHK-CU (50mg) – Nordsci

Purity and a certificate of analysis matter more here than the lowest price on the page, because a clean sample is the starting point for any meaningful result

If you restrict most or all of these wonderful vitamin B12 sources from your diet, you are at a high risk of vitamin B12 deficiency

PatentUS12233111

This is very important because by the time symptoms like this appear it may be too late to reverse them

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Short answer: It appears tolerable in very limited early human data, but there is not enough evidence to call it safe for general use