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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.
There is really no accurate way of measuring exactly how long it will take for vitamin B12 to help your body build new red blood cells, begin healing damaged nerve cells, or boost energy levels.f you begin early on, then you should start seeing results from vitamin B12 before long, depending on how much vitamin B12 you need in order to achieve a normal level.