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Translating this to ADHD: a product or supplement combining, say, 100 mg caffeine with 200 mg L-theanine might give a subtle focus boost for an adult or teen with ADHD

10.1016/j.freeradbiomed.2020.07.026 10 BarringtonW
It is also possible to develop an inflamed or swollen tendon due to chronic, age-related issues

Diabetologia 56 (3), 563572

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