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The present study revealed that both high-dose paraxanthine (PXN HIGH) and high-dose caffeine (CAF HIGH) significantly increased neurotransmitters involved in learning and memory, including acetylcholine, dopamine, and GABA

Feng L, Zhu C, Yuan H, Liu L, Lv F, Wang S (2013) Conjugated polymer nanoparticles: preparation, properties, functionalization and biological applications

In studies on the specific dose of selenium needed to reduce thyroid antibodies, doses below 200 mcg did not help reduce thyroid antibodies, and doses greater than 900 mcg per day were found to be toxic

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