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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.
1 The vitamin also works in conjunction with other B vitamins to increase the body's efficiency when producing energy.  B5 (Pantothenic Acid): Vitamin B5 is responsible not only for energy conjunction along with the other B vitamins, but also for strengthening the body's immune system.