If the answer is "topical only" and the molecule is GHK-Cu, expect surface hydration changes and not much else
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This hormonal cascade works as follows: The hypothalamus releases gonadotropin-releasing hormone (GnRH) GnRH signals the anterior pituitary to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH) LH stimulates the Leydig cells to produce testosterone Rising testosterone feeds back to the hypothalamus and pituitary to regulate production (negative feedback loop) Testosterone is responsible for: Muscle protein synthesis and lean body mass maintenance Bone mineral density Red blood cell production Libido and sexual function Energy, mood, and cognitive function Fat distribution and metabolic health Normal total testosterone in adult men ranges from approximately 300 to 1,000 ng/dL, with levels declining by roughly 1 to 2 percent per year after age 30 (Harman et al., 2001)

In this form, the peptide complex appears to have strong protective and regenerative properties.3 These properties are why youll find GHK-Cu copper peptides (usually listed in ingredient lists under the name Copper Tripeptide-1 ) in various cosmetics, with skin care products being some of the most popular use cases