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Those of us who are deficient and start on a vitamin D supplement usually take five to six weeks to reach the recommended level of vitamin D. If you're in doubt, it's always best to have a chat with your GP who might arrange a blood test. The B vitamins and vitamin C are all water soluble.
B-complex vitamins all work together to support cellular metabolism. B vitamins help the body metabolize carbohydrates, proteins and fats into glucose, which the body uses for energy. Glucose is the main source of energy for the brain and the body. Lack of B vitamins leads to weakness and fatigue.