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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.
If i take vitamin d pills, how long will it take to get my vitamin d level back to normal? 1 doctor responded My doctor prescribed 50, 000 ius of vitamin d twice a week for 3 months.