I would not go into the details of vitamins (e.g. vitamins D, E and K), minerals (e.g. magnesium) and dietary supplements (e.g. fish oil) introduced many times in many places, and would not thoroughly address what they contain in what quantities and forms and why. I would, in turn, highlight a few ingredients I feel it is essential to explain, like why they contain, for example, iodine, choline and vitamin A, why they contain methyl folate instead of folic acid, and why they do not contain iron.