Which vitamin can be synthesized by the sun? Where is it fully activated?

Question

Which vitamin can be synthesized by the sun?  Where is it fully activated?

BlackTom AI · Accepted Answer

The question asks two parts: which vitamin can be synthesized by exposure to sunlight, and where is it fully activated?
First, sunlight enables the skin to synthesize vitamin D3 (cholecalciferol) from a cholesterol precursor. This is the vitamin that can be produced endogenously with sun exposure.
Next, activation occurs in two steps: the liver converts the vitamin D that was produced (or ingested) into 25-hydroxyvitamin D (calcidiol), and then the kidneys convert calcidiol into the biologically active form, 1,25-dihydroxyvitamin D (calcitriol). Therefore, the final, fully active form is produced in the kidneys.
If the statement provided is 'Vitamin D: Kidneys,' it correctly identifies the organ responsible for the final activation step, even though the initial production occurs in the skin and the first activation occurs in the liver.
In summary: vitamin D is synthesized with sun exposure, and the complete activation to its active form occurs in the kidneys after hepatic conversion. This highlights the two-step activation pathway: skin (synthesis) → liver (first activation) → kidneys (final activation).

BIO 132-Introduction to Nutrition-931 7.10 Quiz 3. Vitamins FSV

Which vitamin can be synthesized by the sun? Where is it fully activated?

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