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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.
However, to obtain the benefits of the vitamin, you must take 700 to 1000 IU a day. These studies buttress other research that has shown that vitamin D improves strength, balance and bone health in the elderly. Each year, one third of people 65 and older, and one half of people 50 and older fall at least once.