Cleveland Clinic’s Health Library provides information about diseases, conditions, treatments and body systems to help answer questions you may have about your health — from the everyday to the complex.| Cleveland Clinic
Learn more about our voice, writing process and commitment to all readers.| Cleveland Clinic
Cleveland Clinic advertising supports our core mission and helps us improve our site as a resource for trusted health content. Learn how to advertise with Cleveland Clinic.| Cleveland Clinic
Collagen is an abundant protein, accounting for about 30% of your body’s total protein. Collagen provides structure, strength and support throughout your body.| Cleveland Clinic