This is in pill form, food is usually a whole different ball game. Food sources don’t generally come in super high absorbable or higly convertible sources.
Vitamin D - A lot of Americans are short on vitamin D. For some reason diabetics are prone to lower levels. It actually commonly comes in 1,000, 2,000 or 5,000 iu doses, (even 10,000) but there are many out there with only 400 iu.
Zinc- Too much zinc can suppress the immune system if you try to take a “too high” dose daily. So stay within the 30-150mg doses. Most actually recommend under 50 or 100mg daily as a separate pill, that way usually combined with a multiple you won’t go over the recommended dose.
Vitamin A- This is one you have to be the most careful with, it can help with the immune system, but pregnant or possibly to be pregnant women need to be really careful about the dose of this vitamin. And there very definitely is an upper limit for everyone. Beta carotene converts to vitamin A as needed, and you can take a higher dose of beta carotene, but a diabetic isn’t as good at converting it to vitamin A.
It’s really hard to get a toxic level of Natural Vitamin E, but I suppose you could. It is a blood thinner and at high doses if you have issues with it’s blood thinning properties would cause the most problem. I believe very high doses can result in diarrhea, headaches etc. There has been a recent problem connected with synthetic vitamin e and vaping products that have it. Synthetic vitamin e is the cheaper version that is commonly found in your regular store.
Most of the problems with Vitamin K are with it’s synthetic form too. You are the most likely to have an issue with this vitamin if you are on blood thinners because it helps with blood coagulation. Sold doses are usually pretty small.
Vitamin C is almost always in it’s water soluble form and people have taken huge doses of it, Linus Pauling who did a lot of the research on it took very high doses. The most prevalent problem you will have with higher doses is diarrhea. Diarrhea can occur from even low amounts in some people, but most don’t have an issue until over 2,000 mg.