Vitamin C, is also known as ascorbic acid. It is a water-soluble vitamin and found in some foods such as citrus fruits, Indian gooseberry and other sour fruits. In the body, it acts as an antioxidant and help to protect cells from the damage caused by free radicals. Free radicals are compounds formed when our bodies convert the food we eat into energy. Other factors also cause formation of free radicals like cigarette smoke, air pollution, and ultraviolet light from the sun. Intake of Vitamin C helps to protect the cells.
Vitamin C is also needed to make collagen, a protein required to help wounds heal, improve the absorption of iron from plant-based foods and for good immunity.
Type of Vitamin: Water Soluble
Other names: L-ascorbic acid, Ascorbic acid and Ascorbate
Source: Food and supplement
Function of Vitamin C in Body
It is necessary for synthesis of collagen.
Collagen is a protein present in our body. It is mainly type 1 collagen. It is found in muscle, bones, skin, blood vessels, digestive system and tendons. It gives strength to skin. It helps in elasticity of skin and replaces dead skin cells. Collagen is very essential for wound healing.
It helps in synthesis of L-carnitine and certain neurotransmitters.
L-carnitine is a compound which is necessary for metabolism in most mammals, plants and some bacteria. In our body it is necessary for metabolism and mitochondrial protection. It is an amino acid which has lysine and methionine. It is fat burner as it is responsible for the transport of fats into cells to be used for energy in the body.
It helps in absorption of iron and copper.
It acts as antioxidant. It is helpful in regeneration of other antioxidants in body, like alpha-tocopherol (Vitamin E).
It has important function in immune system. It improves the absorption of non-heme iron (which is form of iron present in plant-based foods).
It helps neutralize the effects of nitrites. Nitrites is preservatives found in some packaged foods which may cause cancer.
It prevents us from scurvy (it is condition which has symptoms like fatigue, widespread connective tissue weakness and weakening of capillary vessels).
High levels of vitamin C are seen in cells like white blood cells, eyes, adrenal glands, pituitary gland and brain.
Low levels of Vitamin C are found in plasma, red blood cells and saliva.
Daily Requirement of Vitamin C
- 0-6 months: for males-40 mg and for females- 40mg.
- 7-12 months: 50mg
- 1-3 years: 15 mg
- 4-8 years: 25mg
- 9-13 years: 45 mg
- 14-18 years: for males- 75 mg and for females 65 mg.
- In pregnancy (14-18 years): it is 80 mg and women who are breastfeeding: 115mg.
- Above 19 years for males: 90mg and for females- 75mg.
- Pregnancy above 19 years- 85mg and during lactation: 120mg.
In smokers- They need 35mg/day more vitamin C than non-smokers.
Sources of Vitamin C
Fruits and vegetable are good sources of vitamin C. Fruits especially citrus fruits are very rich source of Vitamin C. Besides this tomato, potatoes are rich source of vitamin C.
- Red and green peppers
It should be kept in mind that vitamin C content of food may be reduced by prolonged storage and by cooking because ascorbic acid is water soluble and is destroyed by heat. Streaming or microwaving may lessen cooking losses.
Vitamin C present in various food items
- Red peppers: 95mg.
- Orange juice (3/4 cup): 93mg.
- Orange (1): 70mg.
- Kiwifruit: 64mg.
- Green pepper: 60mg.
- Broccoli: Cooked: 51mg.
- Tomato juice: 33mg
Vitamin C supplements
- Sodium ascorbate
- Calcium ascorbate.
- Mineral ascorbates
- Ascorbic acid
Bioflavonoids, combination products, such as Ester-C®, which contains calcium ascorbate, dehydroascorbate, calcium threonate, xylonate and lyxonate.
Vitamin C Deficiency
Vitamin C deficiency leads to conditions like:
Initial symptoms include fatigue which is due to impaired carnitine biosynthesis.
Inflammation of gums
As deficiency progress-Collagen synthesis is impaired. Along with this, there is weakening of connective tissue which is result in formation of petechiae, ecchymoses, purpura, joint pain, poor wound healing, hyperkeratosis, and corkscrew hairs. Other symptoms present like-swollen, bleeding gums and loosening or loss of teeth due to tissue and capillary fragility.
Dry splitting hair
Rough, dry, scaly skin
Deficiency lead to diseases like high blood pressure, gallbladder disease, stroke, some cancers, and atherosclerosis, the build up of plaque in blood vessels that can lead to heart attack and stroke.
Excessive blood loss lead to Iron deficiency.
In children- bone disease can be present due to Vitamin C deficiency.
Smokers and passive smokers: As smokers has lower plasma and leukocyte Vitamin C level, they are higher risk of deficiency of Vitamin C. So, smokers should include more Vitamin C in their diet. Passive smokers are also risk of deficiency of Vitamin C.
Infants who are bottle fed:
As milk is poor source of Vitamin C it may lead to deficiency of Vitamin C in infants. Cow’s milk naturally has very little Vitamin C and heat destroy it.
Individuals who have limited variety of food: These group include elderly, indigent individuals who prepare their won food, those who abuse alcohol or drugs, patient of mental illness and also children.
Patient who mal absorption disease and other chronic disease have Vitamin C deficiency. Along with this cancer patient can also have Vitamin C.
Health Benefits of Vitamin C
Vitamin C prevents age related macular degeneration (AMD) and cataracts– AMD and cataracts are two of the leading causes of vision loss in older individuals.
Vitamin C prevents common cold. Taking vitamin C supplements regularly (not just at the beginning of a cold) produces only a small reduction in the duration of a cold (about 1 day).
It prevents from osteoarthritis. Normal cartilage is destroyed in osteoarthritis, which produces pressure on bones and joints. It is seen through research that free radicals can cause destruction of cartilage. Antioxidants such as vitamin C appear to limit the damage caused by free radicals. Taking nonsteroidal anti-inflammatory drugs can lower your levels of vitamin C. If you take these drugs regularly for OA, you might want to take a vitamin C supplement.
Vitamin C along with Vitamin E prevents eclampsia in women. Pre-eclampsia is associated by high blood pressure and too much protein in the urine. It is common cause of premature births.
- It improves vision who have inflammation of middle part of the eye.
- It treats various type allergies like asthma, eczema and hay fever.
- It reduces effects of sun exposure. It treats sunburn and redness associated with sun exposure.
- It helps in improving dry mouth caused by antidepressant medicine.
Vitamin C helps in cancer prevention. It is seen through research that people who consume high amount of fruits and vegetables have lower risk of cancer. This may be attributed to Vitamin C. Vitamin C limit the formation of carcinogens like nitrosamines. It also improves immunity. It is seen that intake of Vitamin C can prevent cancers of the lung, breast, colon or rectum, stomach, oral cavity, larynx or pharynx, and oesophagus.
It also prevents heart related disease. It may attributed to antioxidant property of Vitamin C, as oxidative modification of low-density lipoproteins, is a major cause of cardiovascular disease. Vitamin C reduce monocyte adherence to the endothelium, improve endothelium-dependent nitric oxide production and vasodilation, and reduce vascular smooth-muscle-cell apoptosis, which prevents plaque instability in atherosclerosis.
It helps prevent damage to LDL (“bad”) cholesterol, which then builds up as plaque in the arteries and can cause heart attack or stroke. Vitamin C may help keep arteries flexible.
- Vitamin C lowers risk of high blood pressure.
- It decreases blood sugar in patient with diabetes.
- Vitamin c reduce symptoms of exercise induced asthma.
- It reduces condition like viral mononucleosis.
Overdose of Vitamin C
Consumption of excessive C produces (High doses of vitamin C greater than 2,000 mg/day.) –
Symptoms: As Vitamin C produces low toxicity, it does not produce any adverse effects on body. But sometimes it produces diarrhoea, nausea, abdominal cramps. This may be due to osmotic effect of unabsorbed vitamin C in the gastrointestinal tract.
It can cause formation of kidney stones.
Vitamin C Supplement
Vitamin C Supplement comes in range from 25 to 1,000 mg.
- Powdered crystals
- Liquid form
Adults should take 250-500 mg twice a day for any benefit. Talk to doctor before taking more than 1,000 mg of vitamin C on daily basis.
Vitamin C Supplementation and Precaution
Vitamin C supplements have diuretic effect. So dr,ink plenty of fluids when taking them.
Haemochromatosis patient (condition in which too much iron builds up in the body), should not take Vitamin C supplements.
Patient of kidney problems should consult of doctor before taking Vitamin C.
People with sickle cell anaemia, as well as metabolic disease like G6PD can have side effects from taking high levels of Vitamin C.
Vitamin C may raise blood sugar levels in people with diabetes. In older women with diabetes, doses of vitamin C above 300 mg per day were associated with an increased risk of death from heart disease.
Vitamin C and drugs interaction
Aspirin and nonsteroidal anti-inflammatory drugs can lower the amount of Vitamin C in body, as they cause more of the Vitamin to be lost in urine. High doses of Vitamin C can cause more of these drugs to stay in the body, which raises the levels in blood.
High doses of Vitamin C may lower the amount of acetaminophen passes in urine, which can increase the levels of drug in blood.
Vitamin C can increase the amount of aluminium in body, which can be a case with aluminium containing antacids.
Barbiturates may decrease the effects of Vitamin C. Drugs include Luminal, Nembutal and Seconal.
Vitamin C can cause rise in estrogens levels when taken with oral contraceptives and hormone replacement therapy. Oral estrogens can decrease the effects of Vitamin C in the body.