studies to prove alfalfa tonic works to increase appetitie?!

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From what I can see there have not been any studies. The assertion has always been anecdotal. Maybe I am wrong or maybe it is your opportunity to engage in ground-breaking research! (-:

Without much scientific evidence, alfalfa is believed to have benefit on various
conditions such as high cholesterol, menopause and poor appetite. In the old times,
Chinese and Indian physicians used young alfalfa leaves to treat digestive disorders.
And, North American Indians used alfalfa to treat jaundice and encourage blood clotting.

Although conspicuously absent from many classic textbooks on herbal medicine, alfalfa did find a home in the texts of the Eclectic physicians (19th-century physicians in the United States who used herbal therapies) as a tonic for indigestion, dyspepsia, anemia, loss of appetite, and poor assimilation of nutrients.2 These physicians also recommended the alfalfa plant to stimulate lactation in nursing mothers, and the seeds were made into a poultice for the treatment of boils and insect bites.

http://zhion.com/Alfalfa.html
http://www.peacehealth.org/xhtml/content…
http://www.hollandandbarrett.com/vf/heal…