Collagen supplements

I recently visited my daughter who I hadn't seen for almost a year. She looks years younger than last time I saw her. Her skin is so smooth and almost wrinkle free (she is 56). I asked what she is using and she said she takes a collagen drink every morning. My son in law is also taking this for health benefits and following recent surgery the doctors were amazed at how well wounds healed. Has anyone else had experience of this supplement?