Vitamin D is involved in several systems throughout the body. Some of the symptoms of having a vitamin D deficiency include a poor immune system, tiredness, low moods, hair loss and general body pain. For this reason, the NHS recommends taking the equivalent of 400 – 800 UI (10 – 20 micrograms) Vitamin D supplements daily. Alternatively, you can have a 30,000 UI booster injection every month.
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