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  • February 12, 2013 at 8:05 pm #13930 Report Abuse
    Anonymous
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    I am aware that tryptophan is a precurser to serotonin and that dog foods high in protein compete with tryptophan to cross into the brain. My question is: If a dog food is high in protein – over 30% guaranteed analysis but the first ingredients is turkey does the tryptophan in turkey still produce serotonin in the brain?

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