Rejuvenol Brazilian 1 hr Keratin Treatment Boosted straightening treatment softens and smooths coarse resistant hair with double the power in less time. The Brazilian 1 hr Keratin Treatment Boosted is designed for coarse, resistant, and extreme curly hair and provides 50% more straightening power than the original Rejuvenol Brazilian Keratin Treatment. The 1 hr treatment can be left on for 1 hour before washing versus the 3 days for the original Rejuvenol Brazilian Keratin Treatment. Rejuvenol Brazilian 1 hr Keratin Treatment is a revolutionary treatment for all kinds of hair. Your hair will be shiny, healthy and manageable.