ghk-cu subcutaneous injection side effects vs NAD+: Which Longevity Peptide Should You Take or Stack? GHK-Cu Peptide Therapy: The Definitive
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MK677 Capsules 12.5mg MK677 Capsules 12.5mg Select options This product has multiple variants

They are both caused by a process known as oxidation

[DOI] [PMC free article] [PubMed] [Google Scholar] 98.Baldino L., Cardea S., Maffulli N., Reverchon E

Vials stored in clear containers under fluorescent or natural light can lose 2030% potency within 72 hours regardless of refrigeration

Going for the cheaper water based products will likely result in less durabilty & longevity
