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Isn't high value for Vitamin D not a problem? Human body can deal with too much Vitamin D by storing it efficiently.

https://en.m.wikipedia.org/wiki/Vitamin_D_toxicity Whilst overdosing is hard, its not impossible. There is no such thing as storing vitamins, or in fact, any nutrients _for free_.

Edit: am I wrong? Ingesting too much fat will be bad for one's health, ingesting too much carbohydrates, minerals, protein will be too. The same goes for any vitamins. There's no _efficient way to store anything_ if you ingest too much of it.

Can't say about them all, but Vitamin A could be stored in the body for like half a year after taking high dosage supplements. Of course, there is a limit, much higher dosage are harmful (the widely known polar bear liver toxicity as example).

This does not apply to all of the vitamins and is more of a special case behavior for Vitamin A.

Generally water soluble vitamins have low retention time while fat soluble vitamins have high retention and are riskier to supplement.

Vitamin D is fat soluble.

It can lead to kidney stones.

Everything leads to kidney stones, it seems.

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