The first multivitamins hit the market in 1943. By the 1950s, bottles of them could be found on many family dinner tables. Americans were gobbling them down — and still are. But do we need them?
, although not prevent it. “Vitamin D may modify the biology of tumors so they are less likely to metastasize,” she says.
She also is studying the effect of vitamin D on coronavirus symptoms — specifically, whether it can reduce upper respiratory infections — but there are no results yet. Nevertheless, she thinks taking a little more of it is a good idea. “During the pandemic I recommend 1,000 to 2,000 IUs, even though the jury is still out in terms of benefits during covid,” she says. “It is very safe. For bone health and other chronic disease, 600 to 800 is sufficient.”Experts say it’s also smart to take vitamin B-12 supplements later in life. Most multivitamins contain 2.4 micrograms, the RDA for adults, but some people may need more, experts say.
“Approximately 15 percent of people over the age of 65 have early vitamin B12 deficiency,” Hensrud says. He suggests his patients in this age group take 500 to 1,000 micrograms daily. “Vitamin B-12 isn’t absorbed well and has a large safety threshold,” meaning high doses won’t hurt, he says. “It’s probably the safest vitamin there is.”CSPI warns consumers not to rely on multivitamins for enough calcium and potassium.
“I think an ordinary multivitamin-and-mineral supplement is reasonable for many people,” Liebman says. “You don’t need the Cadillac of multivitamins. A Chevy is fine. Many store brands are usually perfectly adequate.”
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