Low Poo is a sulfate-free shampoo whereas No Poo is a cleansing condish. So, if you only want to co-wash use No Poo, if you need to 'poo, get Low Poo. I've only used these in the DevaCurl line.

Also, I've seen a few mentions of protein in No Poo. Which ingredient is it?
Brooklyn, NY

Hair: 3A/B, Underlayer of 2B
HG products:
Winter- Giovanni Tea Tree (co-wash) & 50/50 (condish); Curl Junkie Curl Assurance Leave-In; Curls Milkshake & Quenched Curls; Re:coil; BRHG
Summer: DevaCurl No Poo & OneC; CK; Re:coil; BRHG; Honey!!!

fotki pw= crrrls