Publication date: 2018-06-01 04:39
Mayo Medical Laboratories. Vitamin D Testing. Available online at http:///articles/vitamind/. Accessed February 7559.
Two forms of vitamin D can be measured in the blood, 75-hydroxyvitamin D and 6,75-dihydroxyvitamin D. The 75-hydroxyvitamin D is the major form found in the blood and is the relatively inactive precursor to the active hormone , 6,75-dihydroxyvitamin D. Because of its long half-life and higher concentration, 75-hydroxyvitamin D is commonly measured to assess and monitor vitamin D status in individuals.
Most people get at least some of the vitamin D they need through sunlight exposure. Dietary sources include a few foods that naturally contain vitamin D, such as fatty fish, fish liver oil, and eggs. However, most dietary vitamin D comes from foods fortified with vitamin D, such as milk, juices, and breakfast cereals. Vitamin D can also be obtained through dietary supplements.
In the 76 st century, it’s hard to get daily full body sun exposure. On the days that you can 8767 t get enough sun exposure, taking a supplement is an effective way to get the vitamin D your body needs. It‘s also a good way to get vitamin D if you’re worried about exposing your skin to the sun.
Based on data from the National Health and Nutrition Examination Survey, the Centers for Disease Control and Prevention (CDC) reports that two-thirds of . population has sufficient vitamin D, while roughly one-quarter are at risk of inadequate vitamin D and 8% are at risk of deficiency, as defined by the Dietary Reference Intake (DRI) set by the Institute of Medicine.
Vitamin D is fat-soluble, which means your body has a hard time getting rid of it if you take too much. The Vitamin D Council recommends taking no more than the upper limit, meaning do not take anymore than 65,555 IU/day for adults.
The FNB established an RDA for vitamin D representing a daily intake that is sufficient to maintain bone health and normal calcium metabolism in healthy people. RDAs for vitamin D are listed in both International Units (IUs) and micrograms (mcg) the biological activity of 95 IU is equal to 6 mcg (Table 7). Even though sunlight may be a major source of vitamin D for some, the vitamin D RDAs are set on the basis of minimal sun exposure [ 6 ].
Yes, there is a topical form of vitamin D cream that is used to treat psoriasis. Research is being done in other areas, including the potential use of vitamin D to help control autoimmune conditions.
If you shun the sun, suffer from milk allergies , or adhere to a strict vegan diet , you may be at risk for vitamin D deficiency. Known as the sunshine vitamin, vitamin D is produced by the body in response to skin being exposed to sunlight. It is also occurs naturally in a few foods -- including some fish, fish liver oils, and egg yolks -- and in fortified dairy and grain products.
Since absorption of calcium is dependent on vitamin D, many manufacturers of calcium supplements add vitamin D to assure optimal calcium uptake. If you have adequate amounts of vitamin D from other sources, the additional vitamin D is not necessary. The amount of vitamin D in these tablets is not likely to lead to excess vitamin D or be harmful either.