Vitamin D is a fat-soluble vitamin necessary for the growth and development of bones. Vitamin D regulates calcium absorption in the intestines and maintains serum calcium levels. In recent years, vitamin D has gained attention for its role in hormone regulation. In its active pro-hormone form, vitamin D regulates the production of neurotransmitters, including those that regulate mood and alertness. In relation to this function, a deficiency in vitamin D may lead to exhaustion.
The Adrenal Glands
The adrenal glands are triangle-shaped glands that sit on top of the kidneys. They produce the neurotransmitters dopamine, epinephrine and norepinephrine. Also known as adrenaline and noradrenaline, these three neurotransmitters regulate mood and alertness and help cope with daily stress.
Vitamin D and the Adrenal Glands
In its active form, vitamin D helps regulate enzymes necessary for the production of dopamine, adrenaline and noradrenaline. A deficiency in vitamin D may cause an irregular overproduction of these neurotranmitters. When the adrenal glands have to constantly release these powerful hormones, the body experiences constant exhaustion that may lead to chronic fatigue.
Vitamin D Deficiency
Vitamin D deficiency may occur in individuals who consume low levels over time, have limited exposure to sunlight, have kidney conditions that prohibit the conversion of vitamin D to its active form or have inadequate intestinal absorption. Symptoms of vitamin D deficiency include vision problems, fatigue, tiredness during the day and muscle weakness. Depression and seasonal affective disorder are believed to be associated with vitamin D deficiency, though these claims have not been proven.
Considerations
The Recommended Dietary Allowance -- RDA -- for vitamin D in healthy adults is 600 International Units or 15 mcg. It is impossible to get enough vitamin D through dietary sources, so NaturalNews.com recommends 10 minutes a day of sun exposure without sunscreen. Testing blood serum levels is the only way to determine a deficiency. Ask your physician check your serum vitamin D levels if you are concerned you may have a deficiency.
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