My fine/low porosity hair LOVES protein. For me, it tightens the curl and reduces frizz. If hair doesn't like protein, it usually makes it dry and strawlike--doesn't "frizz it up."
3a (Corkicelli), highlighted, fine, low porosity

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix