Prevention with Vitamin C supplement (Ascorbic acid tablets). 20 valid study conducted, with 9,017 individuals. Has no preventive effect. May speed up recovery by 8%. Seems safe.
Do not use this treatment:
It does not prevent cold symptoms, and it only slightly speeds up recovery. The treatment seems safe but pointless.
Any excess of Vitamin C (Ascorbic acid) is evacuated from our body through the urine. This makes vitamin C pretty safe even in high dosages.
Ascorbic Acid tablets
healthy Adults, 16 to 65 years old
Daily dosage of 0.2 gram per day, or more (adjusted to age, gender and body weight).
Prevention of Common Cold symptoms
Does not prevents Common Cold cases. Speeds up recovery by 8%, and may reduce the severity of colds.
0.2-2 gram of Vitamin C per day seems safe for healthy adults and has no side effects. Doctor consultation is needed for diabetic adults, or when in-taking iron (since Vitamin C increases iron absorption).
Common Cold (symptoms caused by viral infection of the upper respiratory system).
Symptoms and signs:
Cough, general discomfort, headache, runny nose, sneezing, sore throat, stuffy nose and weakness.
Bacterial infections: lung infection, middle ear infection, strep throat, sinus infection.
Vitamin C (supplement)
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Vitamin C, also known as ascorbic acid and L-ascorbic acid, is a vitamin found in food and used as a dietary supplement. As a supplement it is used to treat and prevent scurvy. Evidence does not support use in the general population for the prevention of the common cold. It may be taken by mouth or by injection. It is generally well tolerated. Vitamin C was discovered in 1912, isolated in 1928, and first made in 1933. (source)
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