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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.
What are vitamins and how do they work? If you have read the article How Cells Work, then you know that DNA is a template for different enzymes. Enzymes help cells to carry out chemical reactions. A cell is really just an extremely sophisticated chemical machine. A vitamin is a small molecule that your body needs to carry out a certain reaction. Your body has no way to create vitamin molecules itself, so the vitamin molecules must come in through food that you eat.