Oh, I forgot ..... for those who DON'T take vitamin B, I'm guessing that you only have wholemeal bread (not white), only have wholemeal pasta (not white), only have wholemeal rice (not white), only use wholemeal flour (not white) only have wholemeal cereals (not cardboard corn flakes or plastic coco pops). You do? Oh good, then no wonder you don't take b vitamins, you don't need them!
For those who prefer the colour white ... you might like to try them and see how much better you sleep, how much more relaxed you feel, how your stress levels drop, how your muscles stop cramping!
Of course, I wouldn't recommend taking B6 for anyone on L-dopa drugs (but you'd know that already!), and I doubt I'd suggest B3 to anyone with glaucoma or gout (but your doctor probably told you that already).
B vitamins are ESSENTIAL to life, just as all other vitamins and minerals are. People who grow their own fruits and vegetables, make their own bread, breathe fresh country air every day and exercise regularly probably don't need supplements at all. But I wonder how many of those there are left on this planet, sigh.