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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.
Then take 4000 IU of vitamin D for three days in a row. If you are currently suffering from vitamin D side effects, the side effects will fade during the 10 day vitamin D fast and return dramatically during the 3 day period at 4000 IU. experienced no side effects for three months at 4000 IU/day. For the past 10 months Iâve been alternating between vitamin D abstinence for 1 to 2 weeks and supplementation for 1 day. Some of the time, instead of supplements, I sunbath in shorts at noon for 30 minutes to 1 hour.