Assertion: serotonin's effect | /r/CapableOf | lower endurance
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text: The basic anti-metabolic effect of serotonin, melatonin and tryptophan promotes fatigue and lowers endurance (Peat, Spring 2009), and may be involved in the link between fibromyalgia and tryptophan, and probably in many, if not most, negative tryptophan side effects.