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PyroDesu t1_izjb20k wrote

Reply to comment by daywalkker in Can an x-ray of an adult show chronic malnourishment in childhood? by Foxs-In-A-Trenchcoat

Not true!

Sun (or more specifically, UV-B) exposure only generates the inactive cholecalciferol, the same stuff you can get from diet (diet can also give you ergocalciferol, the plant-based version, which works too). The activation process is two enzyme hydroxylation steps, first in the liver and second in the kidneys.

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