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the only primary-source injectable figure is an animal / formulation intradermal range of 100500 mcg per 0.1 mL from a 1990s hair-growth patent [4]
The microneedling evidence base is for delivering established hair compounds a randomized pilot of microneedling plus minoxidil (PMID 23960389) reported greater hair-count change than minoxidil alone, and a 2025 study of copper-peptide microneedling for androgenetic alopecia (PMID 40225275) reported measurable regrowth neither study tested AHK-Cu as a standalone topical
Regular injections are needed to achieve this
This range helps doctors tailor treatments based on how bad the deficiency is and how well the patient responds
simply take the next regular dose to avoid discomfort caused by overdosage
