There are two different formulas. They came out with a "new and improved" one with a different ingredient lists. I never used Surge, but some reported that they like the older one better.
Ohhhh...didn't realize that. I have no idea which one is old and which one is new, but one is fabulous on my hair and the other causes a lot of damage.
Formula 1: (the one I love) Water, cetrimonium chloride, propylene glycol, muccopolysaccharides, hydrolyzed keratin protein, hydrolyzed vegetable protein, polyquarternium-7, biotin, fragrance, methylparaben, aloe barbadensis gel, propylparaben, citric acid, sodium PCA
Formula 2: (YUCK) Water, propylene glycol, PEG-7 Dimethicone phthalate, myccopolysaccharides, cetrimonium chloride, hydrolyzed keratin protein, hydrolyzed vegetable protein, biotin, polyquarternium-7, fragrance, methylparaben, propylparaben, sodium PCA, triethanolamine
HTH!!