I have been taking type 1&3 collagen to help heal my gut and it is supposedly a great pre-biotic, as well. A double win. And on a side note, even if it isn't feeding them----my skin has never been softer and my nails are ridiculously hard----so it definitely is active in my body.
The hip pain (felt like soft tissue damage from my running) I'd been having for over 6 months has disappeared, too. Not too shabby for $11.00/30 day supply. As of right now I have used it for one month.
http://fixyourgut.com/the-digestive-benefits-of-using-collagen-as-a-prebiotic/
EDIT: In case anyone is curious, the brand name is neocell super collagen powder and I bought it on Amazon.
Post Edited (Katie222) : 4/8/2017 6:44:36 AM (GMT-6)