The gelatin in IAGirl's PT is collagen protein, but I'm not sure exactly where that ranks as far as protein strength goes. My hair absolutely loved it though.
CG since 11/2011
2c /3a F /Mii, low porosity

Fall Products /Routine:
Clarifying: Herbal Essences Tealightfully Clean
Low Poo: Renpure Luxurious Argan Oil
CO: Suave Naturals Tropical Coconut or Daily Clarifying, V05 Strawberry or Kiwi Lime
RO /LI:
Tresemme Perfectly (un)Done, Cure Care, V05 Kiwi Lime Squeeze, V05 Strawberry, Renpure Brazilian Keratin (old formula),
Stylers: LALSG, AIF, HETT
PT: IAGirl's as needed