I would consider it extremely light. I think it is more moisturizing than reconstructive. But it does contain protein, albeit a small amount. In the past, I've used it weekly with no problem at all. If you are looking for something heavier, some people have recommended Nexxus Keraphix or Emergencee. I have personally used Affirm 5-n-1, Sebastian 2+1, and the Ion Reconstructor. The Ion reconstructor is the mildest, cheapest and most readily available of the three. When I use these, I make sure that I follow up with a moisturizing conditioner.
HTH