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by mr_overalls 2179 days ago
According to Mayo Clinic, typical caffeine levels are:

Brewed coffee (8 oz): 96 mg Brewed black tea (8 oz): 47 mg Brewed green tea (8 oz): 28 mg

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-h...

It's worth noting that tea also contains theanine, in addition to caffeine. Theanine binds to glutamate receptors and increases serotonin, dopamine, GABA, and glycine levels in various areas of the brain.