First some notes from my practice:
Vitamin D has emerged over the last 10 years as the new wonder supplement (whereas Vit E has fallen from grace).
Vit D demonstrates evidence based reduction in fracture risk, reduced fall risk (due to increased muscle stability, a landmark JAMA article), aids in muscle contractility, promotes proper wound healing, and associated with decreased depression and improved cognitive function (these last two are currently a correlatory finding only).
The old 400iu (international unit) daily recommendation has been increased to 800-100iu. This amount is nearly impossible to obtain via photochemistry alone unless you get multiple hours of equator-grade sun exposure daily.
Even our sun-drenched Iraqi vets are deficient because of the comprehensive clothing/ body armor.
Product Review:
Pros: This specific brand (Doctor's best) has the greatest bang for your buck. Taking one 5000iu cholecalciferol (D3 version) capsule every 2-3 days is more than sufficient.
Capsules are very small, easy to swallow. No taste or odor.
360 capsules are plenty for 2 years of supplementation.
Note other brand's prices, but beware concentration, i.e.- international units per capsule. In this case, the Amazon calculated price per tablet/ capsule is otherwise useless information. Ignore it.
Cons: none
Just don't take a capsule everyday, as this is technically an overdose (>4000iu daily) and can lead to long term issues including electrolyte and hormonal imbalances.
Excess is stored in adipose (as are fat solubles A, D, E & K) but toxicity is quite rare.
Overall: a great buy, on the order of 1/5th to 1/6th the price of your chain drugstore "sale" price for weaker 400iu capsules.
Take this 5000iu capsule once every 2-3 days.
Note on testing for deficiency: Serum testing will usually be low (should be > 20-30mg/dl). Recent evidence promotes testing in those sickly or > 65 only as they're likely to super-deficient and require higher short term supplementation (probably 50,000 iu D2 ergoalciferol semi-weekly)
For those healthy younger individuals, testing is not needed and will not change treatment. Recommendation is to supplement everyone
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