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With both the pill and the shot, people can experience side effects like nausea, constipation or diarrhea
This is why 20mg vials are strongly recommended for the maintenance phase
A 2024 review in BioImpacts synthesizing the topical GHK-Cu evidence concluded that the peptide has consistent anti-wrinkle and skin-rejuvenating activity in human studies, though formulation and delivery remain ongoing challenges [5]
Even so, their shelf life is limited, and most solutions are best consumed within one to two weeks to minimise the risk of degradation
Irregular dosing can lead to side effects like nausea or digestive discomfort
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