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Duration:20 Days Since 90% of the body’s serotonin originates in the gut, modulating enteric serotonin production could influence central serotonergic tone through vagal afferents that relay gut signals to brain serotonin-producing raphe nuclei كريم العيون Effects and Mechanisms of Lutein on Aging and Age-Related Diseases - PMC https://www.tiktok.com/api/img/?itemId=7562581828553575688&location=0&aid=1988

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