Several scientific reviews have shown daily multivitamins to have a weak effect on preventing heart attacks and improving cognition. Instead of taking one pill that can't possibly fit every person's daily requirements, it’s recommended to supplement specific deficiencies or needs.
If you're worried about a particular health problem, pay no attention to your diet, or are always dieting, then search for the common vitamin weakness, and look at your diet.
Millions of people swear by vitamin supplements. But many are wasting their time and some could even be harming themselves, argues Dr Chris van Tulleken. In November 1912 a party of three men and 16 dogs set out from a remote base in eastern Antarctica to explore a series of crevasses many hundreds of miles away.
Image: Thinkstock The widespread belief that most dietary supplements are effective and safe simply isn't true. A few supplements show limited, possible benefits for people with heart disease. But some popular ones don't-and others may be dangerous. Every day, about half of all American adults swallow a dietary supplement-a vitamin, mineral, herb, amino acid, or other substance.
Because of the potential risks and unclear benefits of supplements, most doctors advise against them. However, doctors often recommend specific vitamin and mineral supplements to their patients, such as calcium and vitamin D to prevent osteoporosis and iron for people with iron deficiency.