Supplementation is typically only necessary in cases of intense physical stress or certain medical conditions
The most common findings in preclinical work are injection-site irritation, transient redness or warmth at the injection site (often associated with GHK-Cu), and copper-zinc balance considerations on longer protocols
Last reviewed: June 4, 2026 Last updated: June 4, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations
However, its best to follow the manufacturers instructions and consult an Integrative or Functional medicine healthcare provider Antioxidant-rich diet: Food is medicine
10.1186/s12864-017-3642-5 142 SellamA.DongoA.GuillemetteT.HudhommeP.SimoneauP
The even better news: side effects from vitamin B12 supplements are usually mild, says Richard Foxx, M.D., a board-certified physician who treats hormonal disorders and nutritional deficiencies