bpc 157 en tb 500 BPC-157 & TB-500 – What the Science Says About These Two Miraculous Peptides: Smiley, Tony: 9798289448408 Books BPC-157/TB500 Recovery & Repair Stack
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There is no wrong amount of water, only wrong math

If the COA shows a molecular weight other than ~419.4 Da, the product is not SLU-PP-332

The side effects guide discusses GHK-Cu reactions in more detail

Folate and homocysteine metabolism in neural plasticity and neurodegenerative disorders