The vitamin most likely is a placebo anyway, for example if you read Tim Spector's research he did tests on most of the generic multivitamins and found many of

The vitamin most likely is a placebo anyway, for example if you read Tim Spector's research he did tests on most of the generic multivitamins and found many of the ingredients weren't absorbed as advertised, the only guaranteed method was to get a doctor to inject a vitamin to make up for some b-vitamin variant deficiencies. You can always go pay a clinic to do blood work on you before and after you stop taking vitamins, and reveal your nutrition levels if you're interested