having said this, i would like to make a few statements that may steer people away from moving into this direction, and those who already been led in this direction, toward, the light, or the truth of the matter.
to get one issue out of the way immediately, the RDAs that have been painstainkingly set by many research scientists, are very good guidelines and should be respected, and only in rare circumstances, questioned. i have learned this from many experiances. Now the levels that are chosen by vitamin manufacturers, who generally have a bias towards their own profession, seem to also subscribe to the more is better theory, but this isnt always the case. it is very easy to find OTC vitamin A supplements with 10,000 i.u.s of retinol, or a vitamin d supplements with 2, 4, 8, or 10,000 iu's , or even very high vitamin k supplements, which are manufactured in almost total disregard for the rdas that have been set. and unfortunatly it these are fat soluble vitamins which are much more dangerous then the water soluble b vitamins.
when you study the metabolism of retinol from beta carotenes, you will see that retinol is a highly regulated molecule, and by ingesting large amounts of vitamin a as retinol, you are bypassing these regulatory mechanics and now that vitamin a is going to interrupt other vital process leading to toxic effects. the same goes for vitamin d, it is a highly regulated substance, our skin will turn darker so we stop making vitamin d, this is a protective mechanism, so why would we go and take 10, 000 ius in a pill form? there is almost no reason to take that much. they only recently updated the rda from 400iu to 800iu, sure they updated some previous opinions, but as you see, they werent THAT off the mark to begin with, the same goes for most other rda they have set as well, they are very sensible not way too low as some may suggest.
so you better check yourself before you wreck yourself, and watch out for these crazy vitamin manufacturers, it is truly the wild wild west of alternative medicine these days, too little regulation for the supplement manufacturers i say. good luck.
Edited by AutonomousOne1980, 26 January 2012 - 10:17 AM.