How many vitamins do we have?
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Have or need?\nNeed:    \n    * calcium, vitamin D, phosphorus, magnesium, and     \n      fluoride;\n    * folate and other B vitamins;\n    * antioxidants (e.g., vitamins C and E, selenium);\n    * macronutrients (e.g., protein, fat, carbohydrates);\n    * trace elements (e.g., vitamin A & K, iron, zinc); and\n    * electrolytes and water.\nHave:\nAdenine (Vitamin B-4) - Purine that is definitely not a vitamin.\nAmygdalin (Vitamin B-17, Laetrile) - Anticancer agent and vitamin--not!\nAnthranilic Acid (Vitamin L) - A factor originally thought to be important for lactation.\nAscorbic Acid (Vitamin C) - One of the most ubiquitous vitamins ever discovered.\nBeta-Carotene (Vitamin A precursor) - Yellow pigment that forms vitamin A.\nBiotin (Vitamin H) - Carbon dioxide carrier that builds fats.\nCholecalciferol (Vitamin D) - The vitamin made from rich sunlight.\nCyanocobalamin (Vitamin B-12) - A vitamin that treats pernicious anemia.\nFolic Acid (Folate, Vitamin B-9) - A vitamin that helps fetus development during pregnancy.\nInositol (Myo-Inositol) - A useful sugar once thought to be a vitamin.\nMenadione (Vitamin K) - A fat-soluble vitamin that helps to clot blood.\nNiacin (Nicotinamide, Vitamin B-3) - A pyridine important in nucleic acid metabolism.\nPABA (Para-aminobenzoic acid, Vitamin B-x) - Bacterial vitamin that serves as a sunscreen.\nPangamic Acid (Vitamin B15) - The non-vitamin "vitamin" that cures everything.\nPantothenic Acid (Pantothenate, Vitamin B-5) - Important for normal growth.\nPyridoxine (Pyridoxal phosphate, Vitamin B-6) - A very versatile coenzyme.\nRetinol (Vitamin A) - The first vitamin to be discovered.\nRiboflavin (Vitamin B-2) - The vitamin that gives urine its yellow color.\nThiamine (Vitamin B-1) - A sure cure for Beriberi.\nAlpha-Tocopherol (vitamin E) - What some people call the "love" vitamin is really a free radical scavenger.
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they're enriched with vitamins.
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B vitamins provide health of the skin, bones, hair and muscle; relief of moodiness, restlessness, irritability, and fatigue; relief from skin problems, including dry, itchy skin, rashes and relief from PMS.
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Multivitamins are good, but the +iron I would confide in my doctor.  Many people get enough iron in there daily diet without supplementing iron...iron is usually taken when your anemic.
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There ARE vitamins B3, B4, B5.\n\nVitamin B3 is also known as niacin.  Vitamin B4 is adenine.  Vitamin B5 is pantothenic acid.\n\nB1 is thiamine\nB2 is riboflavin\nB6 is pyridoxine.\netc.  see http://db.ancient-future.net/vitamins.html
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Vitamins coupled with a heathy diet and excercise.
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take multivitamins everyday and eat a lot
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You can start with with Wikipedia at the page referenced below.  As you would expect they have quite a bit on  cholecalciferol - Vitamin D3.   Cholecalciferol being the primary human vitamin in the above series.  I realize this is not a complete answer, but it will get you started.
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Nutrition is a description of all the essential chemicals (vitamins and minerals) that your body needs to function optimally.  Nutritional supplements are vitamin and mineral products that are intended to replace those nutrients that you are not likely to get in proper quantity just by eating the foods you have available in an ordinary diet.\n\nIf you are interested in information about nutritional supplements, write me (jstmother) at yahoo.
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John Hopkins did a study that showed statistically that taking an extra 250 mg vitamin C and 400 Units of E every day would reduce the incidence of Alzheimer's, if I remember correctly. :-0
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Vitamin C for starters.
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600 mg. It wouldn't hurt to take some vitamin D with that.
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Yes they are. However, the manmade products these days are quite impressive. You want to make sure that you buy vitamins that have a "vegetable" base that way they digest in your system completely. A lot of vitamins do not completely break down and our bodies to not reap the entire benefit. Nevertheless, vitamins from fruits and vegetables are always the best way to go.
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take a multi-vitamin every day.  eat plenty of veggies.  snack on nuts or some kind of protien for energy.  try to stay away from junk.
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fat\nA description of the fat-soluable vitamins. ... There are four fat-soluable vitamins and they are: Vitamin A (Beta Carotene or Retinol), Vitamin D, Vitamin E and Vitamin K
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Never trust any vitamins. They do come with all they say but nothing happens. If you want to stay healthy...............eat fruits or veggies and stay out of Junkfood.
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You can actually get more vitamins from the pills than from food.  But usually the vitamins are based on what people "should" be intaking daily from food.  But most people don't get nearly what they need.  It is a very good idea to use vitamin supplimnets if you feel you don't get enough.