Most vitamins are totally useless - here are the ones you should actually take

It seems like simple, obvious advice: Eat your vegetables, get some exercise, and - of course - take your vitamins.

Or not.

Decades of research has failed to find any substantial evidence that vitamins and supplements do any significant good. In fact, recent studies skew in the opposite direction, having found that certain vitamins may actually be bad for you.

Several supplements have been linked with an increase in certain cancers, for example, while others have been associated with a rise in the risk of kidney stones. Still others have been linked with an overall higher risk of death from any cause.

Here are the vitamins and supplements you should actually take - and the ones you should avoid: