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: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on Pinterest (Opens in new window) Pinterest Share on LinkedIn (Opens in new window) LinkedIn Share on Reddit (Opens in new window) Reddit