These results come from randomized controlled trials involving thousands of participants across multiple continents
Glutamine, the most abundant amino acid in the body, is found in most protein sources but particularly high concentrations exist in beef, pork, poultry, fish, eggs, dairy products, cabbage, and beans
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Results after the mental tasks showed that L-theanine significantly inhibited the blood-pressure increase associated with stress, while caffeine tended to have a similar but smaller inhibition of blood pressure
For example, head into another room with a (nonriveting) book and read