Significance[ edit ] Vitamin C is an essential nutrient for certain animals including humans.
GI absorption of ascorbic acid may be reduced in patients with diarrhoea or GI diseases. Total body stores of ascorbic acid have been estimated to be about 1. Plasma concentrations of ascorbic acid rise as the dose ingested is increased until a plateau is reached with doses of about 90 to mg daily McEvoy, Ascorbic acid becomes widely distributed in body tissues with large concentrations found in the liver, leukocytes, platelets, glandular tissues, and the lens of the eye.
Ascorbic acid crosses the placenta; cord blood concentration are generally 2 to 4 times the concentration in maternal blood. Ascorbic acid is distributed into milk.
This is different in people who have excess levels of vitamin C where the half-life is 3. This reaction, which proceeds by removal of the hydrogen from the enediol group of ascorbic acid, is part of the hydrogen transfer system Dollery, The two forms found in body fluids are physiologically active.
Some ascorbic acid is metabolised to inactive compounds including ascorbic acidsulfate and oxalic acid McEvoy, ; Dollery, When the body is saturated with ascorbic acid and blood concentrations exceed the threshold, unchanged ascorbic acid is excreted in the urine.
When tissue saturation and blood concentrations of ascorbic acid are low, administration of the vitamin results in little or no urinary excretion of ascorbic acid.
Inactive metabolites of ascorbic acid such as ascorbic acidsulfate and oxalic acid are excreted in the urine McEvoy, Ascorbic acid is also excreted in the bile but there is no evidence for enterohepatic circulation Dollery, 7. Urinary calcium may increase, and urinary sodium may decrease after 3 to 6 g of ascorbic acid daily.
Ascorbic acid reportedly may affect glycogenolysis and may be diabetogenic but this is controversial MvEvoy, Vitamin C is a co-factor in many biological processes including the conversion of dopamine to noradrenaline, in the hydroxylation steps in the synthesis of adrenal steroid hormones, in tyrosine metabolism, in the conversion of folic acid to folinic acid, in carbohydrate metabolism, in the synthesis of lipids and proteins, in iron metabolism, in resistance to infection, and in cellular respiration.
Vitamin C may act as a free oxygen radical scavenger Dollery, The usefulness of the antioxidant properties of vitamin C in reducing coronary heart disease were found not to be significant Stampfer et al. Doses greater than mg to have a diuretic action.
Doses of 8 g daily decrease serum uric acid. A pregnant woman taking more than 5 g daily may undergo an abortion Dollery, Ascorbic Acid is a natural water-soluble vitamin (Vitamin C).Ascorbic acid is a potent reducing and antioxidant agent that functions in fighting bacterial infections, in detoxifying reactions, and in the formation of collagen in fibrous tissue, teeth, bones, connective tissue, skin, and capillaries.
A Glass of Orange Juice More Protective than Vitamin C Alone.
Consuming vitamin C supplements does not provide the same protective benefits as drinking a glass of orange juice, shows research by Italian researchers in the Division of Human Nutrition at the University of Milan, Italy (Guarnieri S, Riso P, et al., British Journal of Nutrition).
Vitamin C is a naturally occurring vitamin found in fruits (especially citrus), vegetables and some animals. However, humans cannot naturally produce vitamin C on their own, making it necessary to incorporate the nutrient into a healthy diet.
Ascorbic acid is a naturally occurring organic compound with antioxidant properties. It is a white solid, but impure samples can appear yellowish.
It dissolves well in water to give mildly acidic solutions. Ascorbic acid is one form ("vitamer") of vitamin barnweddingvt.com was originally called L-hexuronic acid, but, when it was found to have vitamin C activity in animals ("vitamin C" being defined as a. Vitamin C, also known as ascorbic acid and L-ascorbic acid, is a vitamin found in food and used as a dietary supplement.
The disease scurvy is prevented and treated with vitamin C-containing foods or dietary supplements. Evidence does not support use in the general population for the prevention of the common cold.
There is, however, some evidence that regular use may shorten the length of colds. Buy NOW Vitamin C Crystals Ascorbic Acid % Pure Powder, 8 Ounces on barnweddingvt.com FREE SHIPPING on qualified orders.