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Common side effects are rare but may include: Mild gastrointestinal symptoms such as nausea or diarrhoea (though less common with sublingual than oral routes) Headache or dizziness in some users Skin reactions, including itching or rash, particularly in individuals sensitive to cobalt (a component of cobalamin) Unlike some other B vitamins, oral B12 supplements rarely affect urine colour

GHK-Cu acts as a copper-binding signalling peptide that modulates the expression of thousands of genes involved in collagen remodelling, antioxidant defence, and tissue repair

10.1016/j.jbc.2024.105753 84 XieL.JiX.ZhangQ.WeiY

Fuchs, M

Individuals who are at risk of vitamin B12 deficiency include: Frequently Asked Questions What does vitamin B12 injections do for you

Temporary breaks or dosage reduction can minimize unwanted effects while maintaining benefits