You don't need vitamin supplements. You don't need to waste money on vitamin pills. You just need to eat food, and ideally avoid wacky diets like only eating meat or only eating plants or anything like that.
Eat a balanced diet, go outside sometimes, and you'll be fine.
One single cherry tomato contains enough vitamin C to last you for a week. If you take a vitamin C tablet too, you're just making your pee more expensive.
Some people really do need to supplement things because of idiosyncratic metabolic issues (particularly for B12) or just not having access to enough (RDAs for vitamin D are a joke and normal Western diets can easily be out of whack in terms of omega fatty acid balance).
Vitamin C is presumably not saving any meaningful number of people from scurvy in the developed world, but it does seem to be at least a darn good placebo. There's more to health than avoiding deficiency diseases; and we're talking about typically pennies per day here anyway. A small amount compared to the food it's supplementing.
Eat a balanced diet, go outside sometimes, and you'll be fine.
One single cherry tomato contains enough vitamin C to last you for a week. If you take a vitamin C tablet too, you're just making your pee more expensive.