Transform your hair with Redken's high-performance hair serums, scientifically formulated to deliver targeted benefits and provide advanced protection for all hair types. If you're asking "what is the best hair serum" or "what does hair serum do," our collection offers specialized solutions for various hair concerns, from damage repair to frizz control and heat protection. Acidic Bonding Concentrate 24/7 Day & Night Serum strengthens and repairs all hair types, particularly color-treated hair, working around the clock to fortify and protect. Frizz Dismiss Deflate Oil in Serum Treatment tames frizz and provides humidity protection, leaving hair smooth and manageable even in challenging conditions. For multi-benefit care, One United Leave-in Treatment offers 25 benefits in one lightweight formula, addressing dryness, frizz, and heat protection, making it a versatile solution for any hair type. Redken understands that different hair types and concerns require specific solutions, so we've developed a comprehensive range of treatments to address everything from fine and thin hair to thick and coarse hair, and from color-treated to damaged hair. Ready to experience the transformative power of hair serum? Take the Redken Hair Quiz to discover the ideal serum and treatment regimen for your specific hair type and concerns. Plus, maximize your hair care results and savings by bundling your favorite products together – enjoy 10% off when creating your complete hair care system.