English Performance-enhancing substance Cited by user Hyperforin on 16 Nov 2016 Performance-enhancing substances, also known as performance-enhancing drugs (PED), are substances that are used to improve any form of activity performance in humans.
English Caffeine Cited by user Seppi333 on 13 Mar 2016 Caffeine is a bitter, white crystalline purine, a methylxanthine alkaloid, and is closely related chemically to the adenine and guanine contained in deoxyribonucleic…