Collagen is a family of fibrous proteins that act as the building blocks for skin, bones, teeth, cartilage, tendons and other connective tissues, according to the National Institute of Arthritis and Musculoskeletal and Skin Diseases. Collagen, which helps in healing and repairing damaged bones and cartilages, also maintains the resistance, elasticity and mobility of joints and connective tissue. You can take dietary supplements to restore collagen levels; however, there are several side effects associated with doing so.
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High Calcium Levels
According to MedlinePlus, a website supported by the National Institutes of Health, high calcium levels or hypercalcemia may occur as possible side effects of collagen supplements. Collagen tablets that come from marine sources, such as shark cartilage and shell fish, contain high amounts of calcium, which can significantly raise the calcium levels of the patient using the supplement. Normal values for calcium levels range from 8.5 to 10.2 mg/dl--a reading higher than 10.2mg/dl is considered hypercalcemia. Too much calcium in the body causes constipation, bone pain, fatigue, nausea, vomiting and abnormal heart rhythms. Taking calcium supplements together with this type of collagen tablet should be done with caution.
Hypersensitivity reactions can result as a side effects of taking collagen supplements. As noted on the National Institute of Allergy and Infectious Diseases website, hypersensitivity reactions happen as an abnormal response of the immune system against allergens, such as food, drugs and supplements. Collagen supplements that come from shell fish and other marine sources may cause allergic reactions. Other collagen supplements that come from eggs and their derivatives can also cause food sensitivities, especially in children. Prior to giving injectable collagen, a test is done to check for hypersensitivity.
Bad Taste in the Mouth
Some oral collagen supplements can leave a bad taste in the mouth, according to MedlinePlus. Collagen supplements made from marine sources usually have an unpleasant taste and odor that is not very favorable to most patients. Drinking fruit juice together with this type of oral collagen supplement can mask the unpleasant taste. Acidic fruit juices, such as orange, apple, grape and tomato, can lower the collagen supplement's strength and potency; therefore, they should be avoided.