How is vitamin d2 deficiency treated?
Vitamin D comes in two forms D2 (ergocalciferol) and D3 (cholecalciferol). Vitamin D2 is less potent than D3 but that is largely immaterial. Both must be converted, first in the liver and then in the kidney, into an active form of vitamin D (1alpha, 25-dihydroxyvitamin D). Vitamin D becomes its stored form: 25-OH Vitamin D (which is what they test for in blood tests).
Vitamin D2 deficiency is a made up way of making money from people who should just buy generic Vitamin D3 (Cholecalciferol) which will be more effective and far cheaper. Ergocalciferol is not required by humans.
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