"vitamins" and "micronutrients" tags were two separate tags before, and now Micronutrients redirects to Vitamins. This is erroneous because micronutrients are not only vitamins, there are also minerals and antioxidants. In other words they're not synonims, one is subset of the other.
I propose two answers and let's see which one gets more votes: make vitamins redirect to micronutrients and keep two separate tags. In my opinion the "two separate tags" is the best.