Can youanswer these questions on multivitamins?

The label lets you know what your are taking. If you read carefully, and don't add any others, you won't reach a toxic level. That would be very rare. The formulation tells you the amount of vitamins provided and the level that the FDA has set as required daily maximum. So, you can calculate the ratio. It never goes over the minimum required. There are formulations for babies, toddlers, young children, teen girls, boys, pregnant women, etc. The benefit is that the belief is that people cannot eat enough to get their vitamin and mineral levels from diet, and that soil is actually depleted even if one does eat fruit and vegetables. Toxicity, you will have to research, and don't get caught up on the debates on mive doses of Vitamin C. It is just as easy to eat an orange and a tomato each day. Personally, I don't take them. I did as a child, but don't anymore as they make me hungry. If you eat a good diet, even the vitamin pill will not put you over any toxic level. But do your own research. It think it was vitamin A, they had seen at toxic levels, but I don't remember. Easy to search.