Collagen is a protein responsible for healthy joints and skin elasticity, or stretchiness. It’s in your bones, muscles, and blood, comprising three quarters of your skin and a third of the protein in your body.As you age, your existing collagen breaks down, and it gets harder for your body to produce more. As a result, many people turn to collagen supplements. These supplements are usually powders, though there are also capsules and liquid supplements available.
There are 28 types of collagen, but here are the four most common (2Trusted Source):
Type I: the most common type, found in all connective tissue
Type ll: found in joints and intervertebral discs (the cushions that serve as your spine’s shock absorbers)
Type lll: the main component of reticular fibers, which are found in your skin and blood vessels
Type lV: a component of your kidneys, inner ear, and eye lens
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