Another part in my continuing difficulty in getting a B complex down successfully. I've tried multiple brands, doses, and even alongside Mg citrate to level out any irritability. Still I've been having trouble tolerating B complexes. All of them I try, even in small doses, lead to a distinct "crash" roughly 5-6 hours after taking it. It feels as though my body has been exhausted of energy. Even on a low dose (where there is no noticeable energy boost), I find that hours later, I'm dragging. It's a somewhat similar feeling to having a reasonable caffeinated drink, and then getting the "lull" after it wears off. I do drink a lot of water, and I know B vitamins are water-soluble. Is this a result of them being flushed out? Is it normal & necessary to take a 2nd complex? Think that perhaps my problem isn't too much, but rather too little. Thanks for any input, again.