I wouldn’t worry about 1 A Day or the established brands except that they aren’t getting to the unhealthy populations that could benefit the most. The examples of outright harmful vitamins in these studies tend to be can ones that can potentially cause toxicities. Either people who take vitamins and minerals in amounts above the established upper limits of the Dietary Reference Intakes (DRIs) or above the recommended amount.
I see. thanks. The only vitamin I take larger amounts of is C. It helps me a lot. I do understand not to od on vitamins that accumulate in body and may becone harmful in excess. Thanks. !