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Those are two different kinds of evidence, and neither establishes that one route produces greater systemic exposure in a living organism
Injection site reactions typically clear within 24-48 hours
Editorial update What to check before choosing GHK-Cu Topical Serum Updated Jul 21, 2026 For ghk-cu topical, the decision should start with evidence quality, route of administration, safety limits, product quality, and accessnot a list of benefits alone
Dose adjustments can be made after 4-6 weeks based on rate of progress and tolerance
Benefits typically last from one to three weeks, depending on lifestyle, diet, and individual metabolism
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