Vitamin D is not actually a vitamin, it's a steroid hormone.
A vitamin is an organic compound that cannot be synthesized by the organism itself and therefore must be obtained from diet or supplements.
'Vitamin D' is synthesized in sufficient amounts by the organism alone when exposed to sunlight. The only way to overdose on vitamin D is from the consumption of supplements since the body will naturally stop synthesizing it (from sun exposure) when it's obtained a sufficent amount.
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