Vitamin C, also known as ascorbic acid and ascorbate, is a vitamin found in various foods and sold as a dietary supplement. It is used to prevent and treat scurvy. Vitamin C is an essential nutrient involved in the repair of tissue and the enzymatic production of certain neurotransmitters.
Colleen Ann Fitzpatrick (born July 20, 1972), better known by her stage name Vitamin C, is an American singer, songwriter, record producer, dancer, and actress. She began her career as an Ivory soap baby and child actress, appearing in John Waters' film Hairspray (1988), and continued to appear in minor roles in films before starting the alternative rock band Eve's Plum in 1991.
Vitamin C is also needed to make carnitine, important in the transfer of energy to the cell mitochondria. It is a strong antioxidant. The tissues with greatest percentage of vitamin C—over 100 times the level in blood plasma—are the adrenal glands, pituitary, thymus, corpus luteum, and retina.
- Relative deficiency hypothesis
- Adverse effects
Vitamin C megadosage is a term describing the consumption or injection of vitamin C in doses well beyond the current Recommended Dietary Allowance of 90 milligrams per day, and often well beyond the tolerable upper intake level of 2,000 milligrams per day. There is no scientific evidence that vitamin C megadosage helps to cure or prevent cancer, the common cold, or a variety of other medical conditions. Historical advocates of vitamin C megadosage include Linus Pauling, who won the Nobel Prize i
Vitamin C is an essential nutrient used in the production of collagen and other biomolecules, and for the prevention of scurvy. It is also an antioxidant, which has led to its endorsement by some researchers as a complementary therapy for improving quality of life. Certain animal species, including the haplorhine primates, members of the Caviidae family of rodents, most species of bats, many passerine birds, and about 96% of fish, cannot synthesize vitamin C internally and must therefore rely on
Humans and other species that cannot synthesize their own vitamin C carry a mutated and ineffective form of the enzyme L-gulonolactone oxidase, the fourth and last step in the ascorbate-producing machinery. In the anthropoids lineage, this mutation likely occurred 40 to 25 million years ago. The three surviving enzymes continue to produce the precursors to vitamin C, but the absence of the fourth enzyme means the process is never completed, and the body ultimately disassembles the precursors. In
Although sometimes considered free of toxicity, there are in fact known side effects from vitamin C intake, and it has been suggested that intravenous injections should require "a medical environment and trained professionals." For example, a genetic condition that results in inadequate levels of the enzyme glucose-6-phosphate dehydrogenase can cause sufferers to develop hemolytic anemia after using intravenous vitamin C treatment. The G6PD deficiency test is a common laboratory test. Because ox
Pharmaceuticals designed to reduce stomach acid, such as the proton-pump inhibitors, are among the most widely sold drugs in the world. One PPI, omeprazole, has been found to lower the bioavailability of vitamin C by 12% after 28 days of treatment, independent of dietary intake. The probable mechanism of vitamin C reduction, intragastric pH elevated into alkalinity, would apply to all other PPI drugs, though not necessarily to doses of PPIs low enough to keep the stomach slightly acidic. In anot
There are regulations in most countries that limit the claims regarding treatment of disease that can be placed on food and dietary supplement product labels. For example, claims of therapeutic effect with respect to the treatment of any medical condition or disease are prohibited by the United States Food and Drug Administration even if the substance in question has gone through well conducted clinical trials with positive outcomes. Claims are limited to Structure:Function phrasing and the foll
Scurvy is a disease resulting from a lack of vitamin C (ascorbic acid). Early symptoms of deficiency include weakness, feeling tired and sore arms and legs. Without treatment, decreased red blood cells, gum disease, changes to hair, and bleeding from the skin may occur.
Vitamín C se rozkládá oxidací a to rychleji při větší teplotě. Za pokojové teploty se ztrácí zhruba během měsíce (včetně džusů). U kandování dochází k obdobné ztrátě, ale lze ji zpomalit snížením teploty. Nejlepší je zdroj vitamínu C zmrazit či zabránit oxidaci (skladování tablet v suchých místech).
- 176,12 g.mol−1
- L-threo-hex-2-enono-1,4-lakton, (5R)-5-[(1S)-1,2-dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-on
- 190 °C (s rozkladem)
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Vitamin C i infekcije. Vitamin C potiče rad našeg imunološkog sustava i ubija bakterije. Ako ga ima dovoljno gotovo sve stanice u našem organizmu dobijaju potporu od ovog vitamina, ali najveću korist imaju interferon, antitijela i bijela krvna tjelešca , koja tijekom bolesti gube vitamin C.
Beat Bächi: Volksdroge Vitamin C für alle! Pharmazeutische Produktion, Vermarktung und Gesundheitspolitik (1933–1953). Chronos, Zürich 2009, ISBN 978-3-0340-0921-8 (= Interferenzen. Band 14, zugleich Dissertation an der Universität Zürich 2008). Lester Packer, Jürgen Fuchs: Vitamin C in Health and Disease.
Vitamin C, sinh tố C hay acid ascorbic là một chất dinh dưỡng thiết yếu cho các loài linh trưởng bậc cao, và cho một số nhỏ các loài khác.Sự hiện diện của ascorbic là cần thiết trong một loạt các phản ứng trao đổi chất trong tất cả các động vật và cây cối và được được tạo ra trong cơ thể bởi hầu như ...