Coarse hair doesn't like protein but porous hair does. Many damaged hairs are also porous. So you may have to experiment and see what your hair likes.
My hair likes egg and milk mixed together. It also loves olive oil. Mayo was a disaster though. I smelled like a deli every time I showered for months! Bletch.
2c/3a-M-ii porous, good elasticity, APL, dark brown with a silver lining. Biggest enemy: frizz!