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 ...

If you have kidney disease, speak with your doctor or healthcare professional before taking vitamin B12. Depending on the current health of your kidneys, there may be risks and benefits to taking B12.

Vitamin B12 injections are generally safe, with few side effects and the possibility of allergic reactions. Depending on your health and weight journey, your healthcare provider may prescribe vitamin ...

Vitamin B12 for weight loss: Does it work? Since the dawn of the Internet (and probably well before), there have been several solutions sold for weight management — including vitamins for weight loss.