4. Can vitamins harm my health?
It's possible to overdo fat-soluble vitamins because the body doesn't flush them. Instead, the extra amounts can build up in fat tissues and the liver. But you'd have to chomp a lot to do any damage.
"You could cause harm if you swallowed an entire bottle of vitamin D," Lieberman says. "If you took too much vitamin A, you'd have toxicity. But the first thing you'd experience is a headache."
The adult RDI for vitamin D is 1000 (international units) IU a day (it used to be 400 IU), and the RDI for vitamin A is 5,000 IU a day.
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