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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.
Vitamin D deficiency can even cause cancer. You must focus on your diet. Focus on vitamin D rich foods, try to take advantage of sunlight atleast 20 mins a day. Reha also gave a very good advice. Must follow that.