It is a wonderful plant to use for digestive issues and externally-for humans, it's even being used in combination with other organic products in treating tumors.
I have used it on scrapes on my birds-topically , as recommended by an avian vet, but have not heard of it used for internal use for pigeons. You have to be careful if the product is human grade and not made specifically for pigeons. Always check with manufacturer/biochemist who made the product bwfore using on your birds.