
There are 28 types of collagen, but here are the four most common (2Trusted Source):
- Type I:Â 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:Â the main component of reticular fibers, which are found in your skin and blood vessels
- Type lV:Â a component of your kidneys, inner ear, and eye lens
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