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The recommended daily intake of vitamin D for healthy people varies by age, per the NIH. Children (1–18 years): 15 mcg or 600 IU Adults (18–70 years): 15 mcg or 600 IU
Both vitamin D2 and D3 are good, but “D3 has better bioavailablilty,” says Dr. Manson, meaning that it’s more easily used by your body. But that doesn’t mean any old brand will do.
Vitamin D 3 was shown to result from the ultraviolet irradiation of 7-dehydrocholesterol. Although a chemical nomenclature for vitamin D forms was recommended in 1981, [12] alternative names remain commonly used. [3] Chemically, the various forms of vitamin D are secosteroids, meaning that one of the bonds in the steroid rings is broken. [13]
Vitamin D compounds, specifically cholecalciferol (D3) and ergocalciferol (D2), are used in rodenticides due to their ability to induce hypercalcemia, a condition characterized by elevated calcium levels in the blood. This overdose leads to organ failure and is pharmacologically similar to vitamin D's toxic effects in humans.
The Institute of Medicine in 2010 recommended a maximum uptake of vitamin D of 4000 IU/d, finding that the dose for lowest observed adverse effect level is 40,000 IU daily for at least 12 weeks, [25] and that there was a single case of toxicity above 10 000 IU after more than seven years of daily intake; this case of toxicity occurred in ...
READ MORE. How much vitamin D do I need? Older adults need about 600 to 800 IU of vitamin D daily, depending on their age. You can get this through a combination of sun exposure and vitamin-D rich ...