Natural Vitamins & Supplements Guide
Vitamins are organic substances which are essential for both humans and animals to maintain normal health, growth and reproduction. Human organism is incapable to synthesize vitamins in sufficient quantities and for that reason vitamins must be obtained from the diet. However, all necessary vitamins can not be obtained exclusively from the diet: vitamin K and biotin are synthesized by gut flora or intestinal bacteria, while one of the form of vitamin D is synthesized in the skin through exposure to sunlight.
To maintain the normal health it is necessary to obtain the sufficient daily quantity of all vitamins: vitamin A (retinol), vitamin B Complex (a group of water-soluble vitamins: B1(thiamine), riboflavin B2(riboflavin), B3(niacin), vitamin B6 group (pyridoxine, pyridoxal, and pyridoxamine), B5 (pantothenic acid), biotin, B9 (folic acid), and B12 complex), vitamin C, vitamin D, vitamin E, and vitamin K.
To obtain all necessary vitamins it is important to know their sources which can be either natural or synthetic (in a form of dietary supplements) because there is any source which contains all required vitamins. The easiest way to obtain all necessary vitamins is to eat diversified foods and thus increase the possibility to get adequate amount of all necessary vitamins or to purchase vitamin supplements. There is no difference between the vitamins in natural sources and the vitamins in a form of dietary supplements neither in chemical structure nor in function except for vitamin E and beta-carotene (inactive form of vitamin A). However, while synthetical vitamin E is less effective than the natural one, synthetical beta-carotene absorbs itself in intestines better than the natural ones like generic viagra. Improve your sex life with Viagra - order now in a safe and secured online pharmacy.