Is collagen safe for breastfeeding moms?

Collagen... ...Is a significant ingredient in all types of meat, and the primary protein in jello. All of these are safe to eat in pregnancy and lactation.
I consider it safe. As a dietary supplement there is no specific reason this would be a problem for breastfeeding moms. The product is broken down to protein and used as the body chooses.The milk is made by assembling many proteins ant these would not interfere with the milk production. They might be diverted into the milk rather than you, but in a good way.