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[DOI] [PMC free article] [PubMed] [Google Scholar] [64].Horwitz DA, Zheng SG, Gray JD

Nutrients , 3(10), 858-876

Full human growth hormone stimulates the production of IGF-1 (insulin-like growth factor 1), which drives cell proliferation throughout the body

[24] Seek medical care if swelling, rash, or systemic symptoms develop

Topical effects are usually mild and local: redness, tingling, dryness, or transient irritation, more common above 4% concentration

It is important to distinguish between evidence-based B12 replacement therapywhich is well-established for treating documented deficiencyand the use of lipotropic combinations, which lack robust clinical validation