Caffeine is the world`s most widely consumed psychoactive drug. Caffeine is a bitter, white crystalline purine, and is chemically related to the adenine and guanine bases of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). It is found in the seeds, nuts, or leaves of a number of plants and helps to protect them against predator insects and to prevent germination of nearby seeds. The most well known source of caffeine is the coffee bean, a misnomer for the seed of Coffea plants. Caffeine is known to be an effective substance in anti-photoaging by antioxidant action. And caffeine is widely used in anti-hair loss products. It is also known to play a role in keeping hair healthy by facilitating the flow of blood around the hair to effectively supply nutrients to the hair roots.