i have never been able to ever find the molecular structure of vitamin d that is isolated from humans, only d2 from UV irradiated yeast or d3 synthesized from lanolin
the original "discovery" in 1920 is also in yeast as a pharmaceutical to treat rickets
quotingsome hidden truths about vitamin d3 supplements (Cholecalciferol)
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(it is an active ingredient in rat poison)
The hormone form of D signals your intestines to preferentially absorb calcium over magnesium.
Magnesium is anti-inflammatory; calcium is inflammatory
D3 from wool which is coated in lanolin (sebaceous gland secretions)gets washed with industrial detergents. The extracted lanolin then undergoes a "dehydrobromination reaction" using either 2,4,6-trimethylpyridine (derived from coal tar) or a cocktail of sodium hydroxide, potassium hydroxide, N-Bromosuccinimide, and chloroform.
D3 toxicity typically requires doses above 10,000 IU daily for months
when you get your "vitamin D" level checked the lab is testing for the presence of synthetic markers – specifically, they're measuring 25-hydroxyvitamin D, which is what your liver creates from cholecalciferol.
The Inuit, living in darkness for months, eating a diet of seal and whale – no rickets, no vitamin D deficiency. Traditional cultures worldwide, no access to supplements, no fortified foods, yet no epidemic of bone diseases.