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Many community references include 2-4 week off-periods between cycles to allow fresh evaluation, although the rationale is community-derived rather than trial-validated
That, unfortunately, means that most of the glutathione you take through this method is going to be broken down into bits of protein, rather than being absorbed and used as glutathione itself
Topical glutathione has limited absorption through the skin
For instance, you may benefit from using collagen-boosting ingredients, such as retinoids or vitamin C, in addition to a GHK-Cu peptide
According to a 2021 review, "[Less than 10%] of the intact molecule reaches the plasma and tissues."35 With that in mind, you'll want to look for a brand that maximizes absorption through some mechanism like a liposomal delivery system
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