IR Clinical Hair Thinning Defense Scalp Serum Thicker, fuller-looking hair in 60 days* 8 out of 10 consumers felt the product helped improve hair growth** Developed in collaboration with a world-renowned expert in hair and scalp science, this lightweight, non-greasy serum immediately reduces breakage and has shown noticeable results of thicker, fuller-looking hair HOW TO USE: Apply serum directly to damp or dry scalp while sectioning hair with dropper. Apply up to 1 to 3 droppers to cover entire scalp. Massage in with fingertips. Do not rinse. Use once d