Although rare, some side effects of Ester-C include stomach cramps, diarrhea, headache, nausea and vomiting, states Drugs.com. Increased urination, skin flushing or redness, side pain and lower back pain are other possible side effects. Side effects are more likely to occur in people taking high doses of Ester-C.
Ester-C is a vitamin C supplement used to treat and prevent vitamin C deficiency, explains Drugs.com. Vitamin C assists in the growth and repair of all body tissues, including skin, tendons, ligaments and blood vessels, according to MedlinePlus. Vitamin C also helps the body heal wounds, create scar tissue and maintain the health of bones, teeth and cartilage. As an antioxidant, vitamin C contributes to the body's defense against free radicals.
Although many people use vitamin C to prevent the common cold, research shows that vitamin C supplements do not reduce a person's risk of developing the common cold, explains MedlinePlus. However, as of 2015, studies show that people who regularly take vitamin C supplements or eat diets rich in vitamin C experience shorter colds with milder symptoms.
Eating a balanced diet is the ideal way to get enough vitamin C, notes MedlinePlus. Some food sources of vitamin C include citrus fruit, kiwi fruit, strawberries, raspberries and watermelon. Broccoli, spinach, sweet potatoes, tomatoes and winter squash are other good sources of vitamin C.