Is it dangerous to consume too many water-soluble vitamins?

Dariush Mozaffarian, MD
Internal Medicine
There is a small risk that consuming large amounts of water-soluble vitamins through supplements may be quite harmful. For example, very high doses of B6 -- many times the recommended amount of 1.3 milligrams (mg) per day for adults -- can damage nerves, causing numbness and muscle weakness.  Mostly, though, people who consume high levels of water-soluble vitamins by taking supplements simply pee them out in their urine.

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