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The optimal level of vitamin D in the blood is considered to be higher than 75 nmol/l. If vitamin D is below normal in the blood test, then we recommend an injection of 200 000 IU, and an injection of 100 000 IU every few months is enough to maintain its optimal level.
Overdose of vitamin D in the sun is not possible because the body regulates its production, but care must be taken not to get sunstroke or sunburn on the body. The reserves of vitamin D obtained on sunny summer days is depleted within two months, just in time for the onset of the disease season, that's when Vitamin D is most needed by our immune system for normal functioning.
Vitamin D performs a number of important functions in our body, such as regulating calcium levels. The base level of calcium absorption is only about 10-15%. Vitamin D increases the absorption of calcium by almost 80%, thus strengthening our bones. Older people produce almost 75% less vitamin D naturally than younger people.
A sufficient amount of vitamin D in the body also helps prevent certain forms of cancer, since this vitamin is involved in regulating the immune system and reduces the production of inflammatory cytokines in the body. Cytokines - special chemical mediators produced by immune cells in the area of infection, but their high level in the blood is dangerous and can cause various health problems.
Research published at Boston University indicated the dangerous effect of vitamin D deficiency, vitamin D levels below the norm (75 nmol/l) were associated with an increased risk of developing schizophrenia, depression, cancer and autoimmune diseases.
An undesirably high level of vitamin D in the blood is considered to be from 250 nmol/l, and toxic from 375 nmol/l.


Vitamin D helps prevent weight gain, for example, it can reduce the formation of new fat cells. Vitamin D has been found to help control appetite that reduces overall calorie intake. In addition, vitamin D increases testosterone levels in men, which speeds up the metabolism and helps with weight loss.


Vitamin D deficiency is associated with both headaches and migraines, and levels below 75 nmol/l can cause fibromyalgia, back pain, arthritis, and other health problems.


Low vitamin D levels can decrease sexual desire in both women and men. Erectile dysfunction is more common in men with vitamin D deficiency, sufficient vitamin D intake increases sperm motility and regulates the production of sex hormones. With higher vitamin D levels, IVF (in vitro fertilization) success rates are better.


Vitamin D plays a major role in maintaining brain serotonin levels, and increasing blood levels of vitamin D (for example, after an injection) reduces both anxiety and depression.


By regulating the pathogen-killing protein (cathelicidin), vitamin D strengthens immunity and helps prevent bacterial and viral infections.


Vitamin D stimulates the production of osteocalcin (a non-collagenous protein in bone), which regulates bone growth. Vitamin D deficiency depletes minerals (calcium and phosphorus) from bones, making them weaker.


Lack of energy or fatigue is a common symptom of vitamin D deficiency. This is because vitamin D helps the mitochondria (the cell that produces energy) to use oxygen and provide energy to various parts of the body.