In Kennedys view, its not the governments job to block access to unproven treatments
Retinoids: Retinoids, derivatives of vitamin A, can improve skin tone and texture by increasing cell turnover
Preservatives do not remove contamination introduced by poor handling
Objective evaluations were scored according to spot ultraviolet (UV), spot polarization, skin tone, and efficacy on the medial side of the face photographed using a Janus Facial Analysis System (PIE Co., Ltd, Suwon-si, Gyeonggi-do, Korea), which uses a pigment technology system that assesses the pigment distribution objectively according to three light exposure typesnamely, normal, polarizing, and UV light
Xiangyong et al., 2014)