http://www.healthyvillage.com/product_details/635.html

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Part Used: Herb. Lily of the Valley - cardiac tonic and diuretic. Action similar to Digitalis, though it is less powerful. Sonetimes used in valvular heart disease, also in cases of cardiac debility and dropsy. It slows the disturbed action of a weak, irritable heart, while at the same time increasing its power.

Here's another link:  http://www.desertherbals.net/tinctures/l.htm

Btw:  I found them by googling lily of the valley tinctures