Taking too much vitamin B6 can cause nerve damage and numbness in hands and feet. Niacin at high doses can cause flushing and, in extreme cases, blurred vision and liver damage. Be cautious with high ...

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Madormo is a health writer with over a decade of experience as a registered nurse. She has worked in pediatrics, oncology, chronic pain, and public health. Botox can cause temporary redness, swelling, ...