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Vitamin D should not be taken before bed. Vitamin D is a hormone that your body makes while being exposed to sunlight. This process leads to melatonin shutdown in the pineal gland, because sunlight only occurs DURING THE DAY. The best way to take Vitamin D is a liquid micellized D3 in the morning with dietary fat.
Perhaps the best indicator of general Vitamin D levels is 25(OH)D blood test for it measures Vitamin D from both sun and dietary sources. This form of Vitamin D also lasts in the body for around 30 days. In many cases the ânormalâ or preventative level of Vitamin D has yet to be determined. Cardiovascular risk begins to rise steeply when the blood level of 25(OH)D is below 10-15 ng/mL. Optimal levels may be at least 30 ng/mL.