Its main task is to regulate the level of phosphorus and calcium in the body. Which, accordingly, affects the condition of the musculoskeletal system. Therefore, when vitamin D is not absorbed, this affects the condition, general well-being and health in general. 
The lack of this vitamin does not have a clear clinical picture. But the symptoms and manifestations are well known to everyone: these are frequent colds, depression, muscle weakness, pain in the joints, decreased performance.
There are only two ways to compensate for vitamin D deficiency: through the sun and food. Accordingly, it is necessary to spend time in the sun and include certain foods in the diet. This:
- fish fat;
- ocean and sea fish;
- seafood;
- some types of mushrooms;
- egg yolks;
- butter;
- cheese.
As for the synthesis of the vitamin through the skin, problems arise with this in the cold season, since the number of sunny days is significantly reduced. If necessary, additional vitamin intake is possible, but this is done only after a blood test. The normal level is considered to be 30 ng/ml, the upper limit reaches 100 ng/ml.
Why doesn't everyone manage to normalize their vitamin D levels? 
For babies, 400 IU (international units) of this vitamin is recommended per day. Adults, including pregnant and lactating women, 600 IU. Older adults should consume around 800 IU as synthesis and absorption through the digestive system decline with age.
The following factors can affect absorption:
- diseases of the gallbladder and bile ducts. Since vitamin D is fat-soluble, and bile is needed for the absorption of fats;
- problems with the intestines and disruption of its microflora;
- obesity;
- liver and kidney diseases;
- genetic abnormalities due to which the body does not have receptors susceptible to this vitamin.
Thus, in most cases it is possible to compensate for vitamin D deficiency in the case of the listed diseases, but only after the condition of the underlying disease has normalized.
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