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Some people use low doses of L-theanine and caffeine together to improve focus without feeling jittery.
Urbanek S
Inferring a specific gastric-emptying rate from a side-effect profile is a reasonable hypothesis, not a quantified result

However, one must bear in mind that not all oxidative stimuli create a more oxidized biological state, mild oxidants like H 2 O 2 are normal regulators of cellular homeostasis until the capacity to detoxify them is exceeded [108,144]