This stuff (and the matching sulfate-free shampoo) is the bomb! I did not try it when I had moderately healthy, single-process colored hair. I did try it after deciding to go lighter, which required removing the dark (aging) tint with a "bleach soap-cap", which in this case vas painted and heavily coated in foil, and heated to lift, then wash out the old color (after about 1 hr w/ bleach on). Then it was re-tinted a pretty, lighter brunette. The stylist did a good job, but he lifted it quite a bit more than necessary (which damaged it more), and now I have fried hair. Back to product: this is the ONLY product that has done wonders to restore my hair, help close the cuticle, and help with the nightmare tangling. Every third wash I use a Joico 3.5 PH conditioner that is more focused on moisture, than restoration. I don't know if this product would be too heavy if my hair was its undamaged-self, but now it is my savior. Highest recommendations, and I use only mid-high - to-very high end products. Note to those not attaining same results: 1. You MUST use the accompanying shampoo, and I have NOT found a suitable alternate. 2. You MUST integrate an intensive moisturizer in the loop. If my data are correct, reconstructive conditioners (like this one) will eventually dry out your hair if you do not use / alternate with an intensive, moisturizer. And, products these days frequently do not make it clear which family they belong in. A tiny, tiny bit of Argan oil massaged mainly into shaft and ends (and left in) does nor hurt either. Good luck, and thank you.