Does anyone know of a definitive reliable source for information on vitamins, supplements and OTC remedies?

I am wanting to research vitamin and OTC supplements for my own needs and can’t seem to find reliable definitive research on what works and what doesn’t. Either there is someone saying these vitamins, minerals etc. are mini miracles in a pill and they are then trying to sell you them or there is some research of dubious quality that says it is all snake oil.

Links to any research would be welcomed.