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. 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.