There is a great deal of focus on the dose of vitamin D we should be taking. Correcting vitamin D deficiency: Are we taking enough? Individuals with chronic medical conditions, including osteoporosis, diabetes, kidney disease and women who are pregnant may need to follow other doses recommendations than listed here. In other words, if anyone is going to take vitamin D, they need to know if they are taking vitamin D3 or vitamin D2 and focus on whether they are supposed to be taking it daily or weekly or monthly. studies have shown that individuals who mistakingly take vitamin D2 daily instead of weekly or monthly, can develop serious side effects. For vitamin D2 mega-doses of 50,000 IU weekly (not daily), there is good safety when taken for short periods of time.
Large doses of vitamin D can cause calcium balance to go out of whack, leading to hyperalcemia. For vitamin D3, doses up to 10,000 IU daily are generally viewed to be quite safe for most individuals. We need to respect all supplements since any supplement has the potential to be toxic. In general, vitamin D3 (cholecalciferol) is thought to be more bioavailable than vitamin D2.
It is the only form of vitamin D typically available by prescription. Vitamin D2 is available in 50,000 IU pills which makes higher dosing easier and for this reason it's the typical form using for individuals trying to correct vitamin D deficiency. High doses of vitamin D are available through use of vitamin D2, which is called ergocalciferol. It is not typically available on prescription. Vitamin D3, known as cholecalciferol, is the most common and available in doses of 400, 800, 1000, 2000 IU at most pharmacies and grocery stores. To complicate matters slightly, there are two common forms of vitamin D supplements that can be taken. Vitamin D Insufficiency is 25 OH D levels less than 30 ng/mL (75 mol/L) Vitamin D Deficiency is 25 OH D levels less than 20 ng/mL (50 nmol/L) These numbers of 30/75 come from recommendations of the World Health Organization and others: It's important to take note of these units. Some countries like the United States use ng/mL as their base measure and other countries (such as Canada) use mol/L. It's important to maintain 25 hydroxy-vitamin D levels above 30 ng/mL which translates to 75 mol/L. To monitor vitamin D levels, we don't actually measure vitamin D, we measure 25 hydroxy-vitamin D (sometimes simply referred to as 25 OH D).
Nevertheless, having low vitamin D levels could impair hair function, at least theoretically. This remains controversial from the perspective of hair loss because simply taking vitamin D tablets is not going to promote hair growth for most. Given that there may be some role between hair growth and vitamin D signaling inside cells, the current view is to ensure that vitamin D levels are adequate.
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