I think this is the best take. OP, multivitamins do work. Of course you need to fix your diet, of course it’s better to ingest the vitamin with the food so it can be absorbed better. Of course you should talk to a doctor. But if you have a deficiency of an important vitamin such as C or D, you will notice the difference.

Regarding overdoses, it is almost impossible to hurt yourself by taking a typical OTC multivitamin pill.

Consider some specific foods which give you a boost of the vitamin, such as canned tuna for Omega-3, Brazil nuts for selenium, etc.

But, at the end of the day, the general recommendation is that multivitamins are safe and pretty decent. I wouldn’t recommend any drug to a random person on the internet but multivitamins are fine.

Source: my wife is a nutritionist and we do talk about this a lot. I have a great diet but do take vitamins regularly as a complement or when I’m sick.