Our skin is composed of 70% collagen. Collagen is a fibrous protein responsible for the skin's structure, cohesion, elasticity, and firmness. There are over 28 different types of collagen in the body, with types 1 and 2 being the most well-known. Type 1 is the most prevalent, making up 90% of the body's collagen, and can be found in:
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the skin
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bones
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cartilage
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blood vessels
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hair
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nails
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tendons
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ligaments
Collagen type 2 is specifically found in the articular cartilage of:
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knees
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hips
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elbows
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wrists
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fingers
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intervertebral discs
Both collagen type 1 and type 2 are most commonly found in supplements. Read here which collagen supplement you should choose. Collagen is also found in the bones, skin, bone marrow, or tendons of an animal. Nowadays, these are rarely on the menu, making a supplement a beneficial addition. Want to know more? Read here all about collagen.