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Both the A1 and A2A subtypes are linked to caffeine's mental stimulant effects, but the A1 subtype plays a more important role (Effendi et al., 2020

Sildenafil (Viagra) has been found in supposedly natural nonprescription supplements for erectile dysfunction, for example, and testosterone derivatives have been found in supposedly natural bodybuilding supplements

Journal of Physiology-Paris, 91(3-5), 173-178

3 additional categories are analyzed in the full comparison