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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.
An experiment in 20138 looked at the effects of taking a vitamin D supplement on risk of hypertension in African Americans who had normal blood pressure. The researchers assigned 250 people to receive either 1,000 IU per day, 2,000 IU per day, 4,000 IU per day, or a placebo for 3 months.