[Sparticus]

The RDAs of vitamins are rather arbitrary. More vitamins than some minimum are probably helpful in some sense. But sometimes lights at the end of tunnels turn out to be the headlamps of oncoming trains... perhaps surfeits of vitamins might facilitate body wear in some fashion. And none of our mortal bodies are permanent anyhow. The all things in moderation theory has a lot to be said for it.

If you hadn't noticed, all vitamin supplements reduced their vitamin A content to no more than 5000 IU's per day as there is evidence that along term intake of high doses of vitamin A and beta-carotene can increase the risk of lung cancer and cardiovascular disease.

[Williams]

These anti vitamin articles concern me because they are dealing with one a day multivitamins.

But I think certain supplements especially vitamin D, can be absolutely essential. I believe D has proven health benefits for bone density and cancer prevention.