Help the wound to recover, leaving no scars. Protect the brain (a large part of brain cells are collagen cells, forming a blood-brain barrier to protect the brain)
Pig's trotters (pigskin), kelp, tremella, turtle, fish skin, fish glue, tendon, etc.
Banana, taro, fish, lotus root, bone soup, pig's trotters, tremella, kelp, pig's tail, turtle and bird's nest.
Chicken wings, chicken skin, fish skin and cartilage all contain collagen.
And yam, which is rich in collagen.