Caffeine, calcium, and Tyrosine can all be found in normal food and beverages. There's no need to supplement them unless you have a terrible diet.

You can get vitamin d by going outside every once in a while.

You should check out the research cited on Vitamin D in the first link: "vitamin D supplementation decreases all-cause mortality in adults and older people"

While it certainly is possible to "get vitamin D" by going outside, that doesn't mean it's enough.

The leading theory as to the advantage of having white skin is that it assists in providing more vitamin D in latitudes without as much direct sunlight. This means the amount you get by "going outside once in a while" is not sufficient (otherwise we wouldn't need the advantage of getting as much as possible)

Likewise, drinking coffee removes calcium and vitamin d from your body, so it is wise to replace them, especially if you drink a lot of coffee.

Also, while I might not "need" to supplement them because I am getting "enough" that doesn't mean I won't benefit by taking more. Indeed, we're talking about Nootropics here, not just staying alive.

what "normal" food contains caffeine? brewed coffee is a drug preparation. the trace quantities of it you find in things like chocolate are largely below the level of being noticeable or effectual. chocolate itself is essentially a drug preparation also. you aren't eating chocolate purely for nourishment. you eat it because it makes you feel good.

so I ask again, what is "normal" food? where do you get your ideas of normal from?

If you live in southern US or in Australia, maybe. No way in most of Europe or UK, except during summer. Too low insolation.