Re: Can't tolerate B12 - how to supplement then.

I have the same reaction to B vitamins. I find that I have less side effects if I take frequent small doses throughout the day rather than one large dose at one time. Make sure you're hydrated well enough so that your cells get nourished with the vitamins. This reduces side effects too. Somehow I get bad reactions to meds or vitamins if my blood pressure is too low. Tweet