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Vitamin D3

Cholecalciferol, or Vitamin D3, can be taken orally or given as an intramuscular injection to boost levels of this vitally important nutrient. Each injection provides 100,000 units of D3 and can be given monthly for 4 to 6 months for very low levels, or as a single dose to boost immunity or help you prevent or recover from colds and flu. Because it is very powerful, a low serum vitamin D needs to be documented prior to getting a series of these, and serum calcium needs to be monitored.