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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.
Spend some time outdoors in the sun every day to bring your vitamin D3 levels up fast. Just 15 to 20 minutes of sun exposure daily can prevent vitamin D deficiency in most people. Those with darker skin tones might require more time in the sun.