Much like obesity, some people are entirely unaware of a vitamin C deficiency. The deficiency sufferers often suffer bleeding gums, feel tired or depressed, experience difficulty sleeping, feel sluggish, develop rashes, or catch colds.
These are only symptoms, however it is recommended that measures be taken to prevent them from worsening into clinically evident diseases.

(1) Lowering Blood Glucose Level

Vitamin C acts like insulin in lowering blood sugar level. Insulin enables cells to absorb glucose in order to turn it into energy. When the body either does not produce enough insulin or does not properly respond to it, blood glucose level increases, leading to a condition called diabetes. Taking vitamin C along with insulin moderately improves the function of insulin to lower the blood sugar level.

(2) Building Bones

Vitamin C involves absorption and metabolism of calcium, one of the most prominent nutrients in preventing fractures and osteoporosis. However, it is important to remember that ingesting vitamin C along with calcium is essential.

(3) Lowering LDL Cholesterol

Vitamin C helps lower the level of LDL (bad) cholesterol while increasing HDL (good) cholesterol. It is important to avoid excessive sugar and fat, ingesting enough vitamin C to maintain levels of the two kinds of cholesterol within normal ranges.

(4) Decreasing Neutral Fat

Vitamin C helps the body consume neutral fat, preventing or mitigating hyperlipidemia.

(5) Anticarcinogen Effect

Vitamin C prevents formation of nitrosamine carcinogen, also fighting the nitrosamine and other types of carcinogens that have already formed.

(6) Warding off Colds

"Eat some mandarin oranges" is probably one of the most common recommendations for young Japanese children who catch cold. As most people are aware, the common cold is most often caused by infection with one of a number of viruses, and there is no wonder drug or effective cure for a cold. Vitamin C, however, exerts its effects on viruses both directly and indirectly. The power of vitamin C to fight viruses is effective in an extremely broad manner, which is why vitamin C is a preferred choice as a remedy for a common cold caused by many different types of viruses.
The most important function of vitamin C is to boost the immune system of the body to fight off infection.

(7) Providing for Vitamin C Consumption in Exercise

It is said that the body consumes 100 to 200 mg of vitamin C in a light workout of approximately one hour, and a great deal more with heavy exercise.

(8) Vitamin C for Smokers

Smokers are said to be smoking away 100 mg of vitamin C per cigarette, which is why they are encouraged to take extra vitamin C. Both heavy smokers and non-heavy smokers are said to lose almost the same amount of vitamin C.
Non-smokers who regularly share an area with smokers are also recommended to take extra vitamin C, as secondhand smoke contains toxic substances linked to cancer.

(9) Vitamin C and Alcohol

Unlike cigarettes, alcohol in moderate quantities is not linked to vitamin C depletion. However, Vitamin C helps the body eliminate alcohol.

(10) Ingesting Vitamin C along with Other Medications

Drugs and medicines are chemically synthesized non-biological substances, so the human body recognizes the pharmaceutical ingredients as unfamiliar substances and tries to eliminate them from the body, using up vitamin C. Vitamin C also can help the medication to offer its intended effects. In the U.S., ingesting vitamin C along with medicines is common.