Combining supplements is not always a bad thing, as it can be beneficial in some cases. However, certain supplements may interact with each other and taking higher than recommended doses may increase the risk of them causing harm. Knowing what you need most is the first step, and then you can add supplements of those vitamins to your daily routine. It is important to track the percentage of recommended dietary dose needed, as taking too much of something can have physical indicators.
Vitamin C and Vitamin B-12 should be taken at least two hours apart, as taking them together can reduce the amount of Vitamin B-12 you receive. If you are vegan or vegetarian, you need a supplement for Vitamin B12.Different genetics, family history, or even a previous diagnosis can also influence the need for a supplement. As a natural progression of aging, the kidneys don't filter as well, so it wouldn't be wise to take more than the recommended daily allowance of dietary supplements. Whether or not to take a supplement with food depends on the supplement, as some are better with and others without them.
In light of recent studies, most experts say that dietary supplements are not what they once thought.