Collagen provides structure to your arteries, which are the blood vessels that carry blood from your heart to the rest of your body. Without enough collagen, arteries may become weak and fragile.
This may lead to atherosclerosis, a disease characterized by the narrowing of the arteries. Atherosclerosis has the potential to lead to heart attack and stroke.
In one study, 31 healthy adults took 16 grams of collagen daily for 6 months. By the end, they had experienced a significant reduction in measures of artery stiffness, compared with before they started taking the supplement.
Additionally, they increased their levels of HDL “good” cholesterol by an average of 6%. HDL is an important factor in the risk of heart conditions, including atherosclerosis
Reference:
Tomosugi, N., Yamamoto, S., Takeuchi, M., Yonekura, H., Ishigaki, Y., Numata, N., ... & Sakai, Y. (2016). Effect of collagen tripeptide on atherosclerosis in healthy humans. Journal of atherosclerosis and thrombosis, 36293.