Vitamin E is both a nutrient and antioxidant, and the oil in its purest form is extremely versatile. Known as tocopherol, it has a light brown/reddish hue and can be found in many skincare products.

Vitamins supplements are commonly taken by many people to treat a variety of health problems. Over time, however, vitamins can degrade, causing them to become chemically altered. Although vitamin C degrades, it is not toxic.

Eye twitches can be a temporary, minor annoyance, but in severe cases they can affect your vision and cause a great amount of discomfort. Medically known as myokymia, eye twitches can be caused by stress, fatigue, alcohol, caffeine, allergies and eye strain, although the cause is often unknown.

According to the U.S. Food and Drug Administration (FDA), consumption of EPA and DHA omega-3 fatty acids may reduce the risk of coronary heart disease; more research is needed, however.

A multivitamin can help you meet your body’s daily requirements for vitamins and minerals. A multivitamin, or supplement, should not be used to replace any foods or food groups. When taking a multivitamin or supplement, it’s important to take it at the same time every day.

Eight substances make up the vitamin B complex, including thiamine, riboflavin, niacin, pantothenic acid, biotin, folic acid, vitamin B6 and vitamin B12. Poor absorption of these substances can result in diseases caused by vitamin B deficiencies, like beriberi, pellagra and pernicious anemia.

B vitamins help your body generate energy from the foods you eat and assist with the formation of red blood cells. A lack of certain B vitamins, specifically B-12 and B-6, can lead to diseases such as anemia, respiratory infections and eczema.

Emergen-C is a powdered drink mix containing a variety of vitamins and minerals. Even though Emergen-C is sold over the counter and is generally safe, side effects such as gastrointestinal problems, gluten reactions, poor drug interactions and allergic reactions could occur.

Although eating a balanced diet is the best way to ensure adequate nutrition, popping a vitamin supplement is a good way to fill in the gaps.

The Office on Women’s Health recommends women of childbearing years get 400 to 800 micrograms of folic acid daily whether or not you have visions of a baby in your future. Folic acid, or vitamin B-9, is the man-made version of folate, which is found naturally in foods.

Citric acid is common in foods. It's both naturally occurring and a common additive that serves as a flavoring agent and preservative. Your cells also make citric acid. The citric acid you consume is neither good nor bad for you, and the citric acid you make is essential to life.

Many vegetarians, vegans and the elderly have a difficult time consuming their recommended daily allowance of vitamin B-12.