Doo Gro® Medicated Hair Vitalizer. Triple strength for severely damaged hair. Promotes strong, healthy growing hair. Doo Gro® hair vitalizer triple strength formula. Helps promote strong, healthy growing hair. This unique triple strength formula works wonders even on severely damaged hair. Safe to use on all types of hair, including natural, relaxed, color treated and children's. Guarantee information visit doogro.com or mail request to: Nature's Protein®, Inc. Made in USA. Guaranteed results or your money back!