I'm kind of curious because my father takes 5 supplements on a daily basis (high-dose vitamin C, omega-3, curcuma, a herbal supplement I don't recall, and chlorophyll), even more diligent than his diabetes medication. Well, he barely eat fruits and vegetables, so I kind of see his thought, though I cannot say I agree with him. Once he asked me pseudo-innocently if he could find another source of nutrients. I rolled my eyes and sarcastically told him that unless he changed his diet, he would be addicted to the supplements - as well as wasting lots of money. But again maybe it's just that he practically believes in anything the supplement producers advertise.
Then there is a friend of mine who drinks chlorophyll and a brand of multivitamin every day, stating the same reason: since she does not eat veggies because she doesn't like it, she will have to suffice her vitamin requirements some other way.
Not trying to judge though; I take glucosamine too, although it's because I'm concerned of my poorly-shaped knee. And occasional vitamin C when I'm not feeling well.
How about you guys?
Remember that mandatory drug/supplement consumption due to conditions doesn't count (e.g. iron supplementation for iron deficiency anaemia).