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The hormone oxytocin, which has been associated with interpersonal bonding, may enhance the pleasure of social interactions by stimulating production of marijuana-like neurotransmitters in the brain, according to a new study. The research provides the first link between oxytocin — dubbed the ‘love hormone’ — and anandamide, which has been called the ‘bliss molecule’ for its role in activating cannabinoid receptors in brain cells to heighten motivation and happiness.