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It depends on your reconstitution concentration

Hair Follicle Biology Research Studies have examined GHK-Cus influence on hair follicle biology in pre-clinical models, with research exploring its effects on follicle size, hair growth cycle parameters, and scalp tissue biology an area of active research interest given GHK-Cus broad influence on skin and connective tissue biology

10.1038/s41467-020-20795-9 52

For men experiencing fatigue alongside body composition changes which can reflect GH decline, testosterone decline, or both the breakdown in the guide to hormonal symptoms in men over 50 is a useful reference for understanding which system may be the primary driver

Safety Assessment Acute toxicity A single subcutaneous injection of AOD 9604 (50 mg/kg) did not cause death or obvious toxic reactions in mice