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2. Skin Reactions

In rare cases, excess vitamin B12 may trigger skin reactions like itching, rashes, or acne—especially in people with underlying sensitivities. Some studies suggest that high-dose B12 can interact with skin bacteria, leading to breakouts or dermatitis. Those with preexisting skin conditions should speak with a healthcare provider before starting high-dose supplements.

An African American Woman With Dry, Itchy Skin

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.