Ask DrJProfessional Ask Dr. JVitamin C Vitamin C in Cosmetic Products DrJ A customer writes in to Dr. J to ask if vitamin C in cosmetic products is effective for the skin.Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X Click to share on Pinterest (Opens in new window) Pinterest Click to share on LinkedIn (Opens in new window) LinkedIn Click to share on Reddit (Opens in new window) Reddit