Tin is found in some toothpastes, and it has been used in the form of stannous chloride as a chemical preservative. It is also added to asparagus to improve its taste, while in some countries it has been utilized as a remedy for intestinal parasites. Herbal Sources of tin include doggrass, juniper, bilberry, milk thistle, dulse, lady slipper, althea, valerian, Irish moss, nettle, barberry, yarrow, blessed thistle, red clover, yellow dock, kelp, licorice, devils claw, pennyroyal, and senna... Full Text