More research suggests it’s time to abandon the craze over vitamin D. Taking high doses of “the sunshine vitamin” doesn’t reduce the risk of broken bones in generally healthy older Americans. That’s according to a large study that tracked people given either high-dose vitamin D or dummy pills for five years. The same study had previously found extra vitamin D didn’t prevent heart disease, cancer or memory loss either. Millions of Americans use high-dose supplements or take blood tests to check their vitamin D, amid controversy over whether the average person needs either.