A tough, biodegradable, hyperbranched epoxy was synthesized by polycondensation of a castor oil-based hyperbranched polyester polyol with bisphenol A and epichlorohydrin.

The Dermaroller is a sleek, 0.5mm microneedling tool meant to increase serum absorption and stimulate circulation at the hair follicle level. You roll it across the scalp before applying the serum, ...