Experience the transformative power of pure silk with Biosilk Silk Therapy Original. This iconic serum goes beyond ordinary hair products, working to repair, smooth, and protect your hair from root to tip. Its lightweight, non-greasy formula penetrates the hair shaft to fill in uneven cuticles, reduce frizz, and add incredible shine. Whether used as a leave-in treatment, to protect hair from heat styling, or to add a luminous finish, Silk Therapy Original leaves hair feeling silky smooth and looking remarkably healthy.