![]() When choosing a supplement, check the IU on the bottle. Symptoms of vitamin D toxicity may include nausea, vomiting, frequent urination, weakness, bone pain, and kidney pain, according to the Mayo Clinic. “Vitamin D increases calcium absorption, and therefore toxicity is marked by a buildup of calcium in the body,” says Kimberlain. The maximum daily limit is 4,000 IU for people age 9 and older, Kimberlain says, but Harvard Health Publishing notes that an increasing number of people are taking more than this upper recommendation. The NIH recommends that adults ages 19 to 70 take in 15 mcg (600 IU) and adults ages 71 and older take 20 mcg (or 800 IU). The most common way this happens is by taking too high a dosage of vitamin D supplements. “While it is rare to get too much vitamin D, it’s not that it can’t happen, and this situation - a vitamin D toxicity - has serious health consequences,” says Amy Kimberlain, RDN, a spokesperson for the Academy of Nutrition and Dietetics and a certified diabetes care and education specialist (CDCES) based in Miami. ![]() Too much of a good thing can be a bad thing, and so it goes with vitamin D. Myth: The More Vitamin D You Get, the Better ![]() ![]() Read on to explore the facts, and some common myths, about vitamin D. RELATED: Can Taking a Vitamin D Supplement Protect Against COVID-19? There’s no vitamin or supplement that is a cure-all, health experts agree. “There’s an expectation that vitamin D is a miracle drug, and that if we all just take megadoses of it, it will solve all problems,” says Anne McTiernan, MD, PhD, a professor of epidemiology at the Fred Hutchinson Cancer Research Center in Seattle and the author of Starved: A Nutrition Doctor’s Journey From Empty to Full. ![]() Still, with all that chatter come some misconceptions. According to the National Institutes of Health (NIH), among its functions are strengthening bones, absorbing calcium, and bolstering immunity. It’s no wonder: Vitamin D is a workhorse nutrient. With the possible exception of C, there’s perhaps no vitamin more frequently discussed than the sunshine one - aka vitamin D. ![]()
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