Mega dosing is pretty useless, except for B12.
Not true. It may be useful for most B-vitamins.
I find it funny how irrationally opposed people here are against what they consider "overdoses" of B-vitamins. First, there is
no evidence
at all that B vitamins in sub-100mg doses cause any adverse effects whatsoever - except for folate, which, for this very reason, is always contained in RDAish amounts in formulas. Second, there is a host of known and yet unknown genetic mutations which cause an decrease in some enzymes' binding affinity to coenzymes and which in many cases can be by treated by the intake of the corresponding B-vitamin in doses
10 to 100 times the RDA. Now consider that there may be many relatively mild cases of enzyme-insufficiency caused by genetically decreased binding affinity, which cause vague and subclinical symptoms only (or long term-consequences showing up with an advanced age) and won't ever be diagnosed: such mutations would equal to a chronic functional deficiency of the according B-vitamin(s)
despite optimal intake and blood levels. We don't know how common such enzyme insufficiencies are, but if there's a chance that you
may have one, and it
may be alleviated by the intake of an abundance of B-vitamins, which are dirt-cheap and non-toxic - wouldn't it be rational to go that route, just to be on the safe side?
For more details please read this brilliant paper by Bruce Ames et al.:
http://ajcn.nutritio...t/75/4/616.full
Edited by timar, 22 August 2013 - 08:23 AM.