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If it is past the expiry date, replace it rather than using it, since the sterility and preservative strength are only guaranteed up to that date

One of the most common debates in the GHK-Cu community: should you use injectable or topical

Unlike plain sterile water, which must be used immediately after opening due to contamination risk, bacteriostatic water is designed for multi-dose use, the benzyl alcohol inhibits microbial growth, allowing the vial to be accessed multiple times over a 28-day period while maintaining sterility

Inhibitory effect of peptide Epitalon on colon carcinogenesis induced by 1,2-dimethylhydrazine in rats