Caffeine, like nearly all alkaloids is characteristically bitter. https://pubchem.ncbi.nlm.nih.gov/compound/caffeine#section=Experimental-Properties https://pub

Caffeine, like nearly all alkaloids is characteristically bitter. https://pubchem.ncbi.nlm.nih.gov/compound/caffeine#section=Experimental-Properties https://pubchem.ncbi.nlm.nih.gov/compound/caffeine#section=E...