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Its also added to Pepsi and Coca Cola in the form of aspartame. Phenylalanine is a mood inhancer and stimulates serotonin in the brain. It actually links up with the pleasure receptors in the brain and satisfies them the same way sex and drugs do.
A lot of chemicals are naturally found in the body but in minute amounts. '___' is in found naturally in the brain and all of nature too. But take too much of that and your brain does some wacky things. Its the same with a lot of chemicals