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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

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

If minor weight regain has occurred, determine whether it is dose-related or lifestyle-related before adjusting medication