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Concentration adjustment proves essential with under-eye products requiring 30-50% lower active concentrations than facial formulations to prevent irritation - while 1-2% GHK-Cu works well on face , 0.5-1% proves safer for eye area maintaining effectiveness while minimizing redness or stinging risks

[DOI] [PMC free article] [PubMed] [Google Scholar] 16.Goyal P., Choi J., Pinheiro L., Schenck E., Chen R., Jabri A., Stalin M.J., Campion T.R., Nahid M., Ringel J.B., et al

R.SureshG.GopalakrishnanG.BanumathyB.MasilamaniS

For example, certain biological products or drugs (like some vaccines or delicate protein-based drugs) should not be reconstituted with bacteriostatic water because the preservative could interfere with the drugs stability or efficacy