I have thick, dry, unruly hair that takes a long time to dry, then straighten. I've tried every high-end, low-end and mid-range ‘miracle' hair product out there but none stand out as making a difference, especially to the time it takes to do my hair. I've used the Brasil Cacau smoothing treatment before, with good results, so thought I'd give this serum (coupled with BC Extreme Repair shampoo & conditioner) a try ... and I was astounded at the results. Hairdryer time was at least 50% less, It dried fairly straight with no fuzzy fly-aways as I was drying it, and (after a quick run through with the straightener) very little extra product to keep my hair in place - just a bit of spray to keep hair out of my eyes. My hair felt very smooth and natural and I refreshed it the next day with my straightener, rather than washing it as usual. Like I said, I'm astounded ... and now I have to go and buy every bottle I can get my hands on to ensure a lifetime supply.