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for educational and safety purposes
Caffeine and Theobromine both come up in the same conversations. Caffeine: Caffeine is a central nervous system stimulant of the methylxanthine class and the most widely consumed psychoactive substance in the world. Theobromine: Theobromine is a bitter methylxanthine alkaloid and the principal stimulant compound of the cacao plant (Theobroma cacao), giving chocolate and cocoa much of their mild pharmacological activity.
Caffeine is a central nervous system stimulant of the methylxanthine class and the most widely consumed psychoactive substance in the world. A purine alkaloid found naturally in coffee beans, tea leaves, cacao, and other plants, it is used to restore alertness, reduce fatigue, and sharpen concentration. It is legal and largely unregulated in most countries, and it also has established medical uses, including the treatment of apnea in premature infants.
Theobromine is a bitter methylxanthine alkaloid and the principal stimulant compound of the cacao plant (Theobroma cacao), giving chocolate and cocoa much of their mild pharmacological activity. Chemically it is 3,7-dimethylxanthine, an isomer of theophylline and a close relative of caffeine, and it also forms in the human body as a major breakdown product of caffeine [1][3]. It has gentle effects on the heart, blood vessels, airways, and kidneys, and unlike caffeine produces little central-nervous-system stimulation; it is well tolerated in people but is toxic to dogs and some other animals [1].
both fingerprints on one instrument; where the marks line up the two compounds work the same lever, where a slot goes dark only one of them touches it. read straight from each entry's affinity table; nothing here is invented.
Blocks adenosine A1 and A2A receptors
antagonist
Raises dopamine and catecholamine signaling
Improves force production and lowers perceived exertion
relaxes
relaxes
inhibits
strengths are the entries' qualitative ratings (strong / moderate / weak); Ki and EC50 figures appear where an entry records them.
easiest to source: Caffeine is currently listed by more trusted vendors (2), so it's the simpler one to get hold of. for effects and safety, read each full entry; this is educational, not medical advice.