Umeboshi plum is a misnomer. The term umeboshi means "dried ume," where ume is 
usually
translated as plum. But it is not a plum. It is a species of apricot. It has 
several organic acids
with medicinal effects, including the seemingly paradoxical effect of 
alkalizing the body.

1. Umeboshi has a high concentration (perhaps the highest concentration in any 
fruit) of citric
acid. Citric acid enables the small intestine to absorb alkaline minerals from 
other foods that
would otherwise not be absorbed.
2. Umeboshi itself contains high amounts of alkaline minerals (iron, calcium, 
potassium,
manganese, etc.)
3. Citric acid breaks down lactic acid produced metabolically in our blood and 
tissues.
4. Umeboshi contains picric acid that stimulates and supports the detoxifying 
action of the
liver.
5. Umeboshi contains catechin acid which speeds peristaltic action in the 
intestines as
well as the digestion of proteins.
6. Umeboshi peel contains pectic acid which has a laxative effect.

This information comes from the Kushi Institute.

Matthew