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Glutathione deficiency can worsen liver stress
Delivery enhancers: Microneedle pretreatment increased GHK-Cu penetration in a preclinical study (PubMed)
That said, oral B6 supplementation at 10-25 mg daily is a reasonable, lower-cost alternative for people who cannot access the compound formulation
Side effects can include minor discomfort, swelling, and bruising at the injection sites, which generally subside within 1-2 weeks
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