The common periwinkle or winkle (Littorina littorea) is a species of small edible whelk or sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles.
Periwinkle contains tannins that bind up fluids and relieves inflammation. They are low in Saturated Fat. It is also a good source of Protein and Potassium, and a very good source of Vitamin E (Alpha Tocopherol), Iron, Magnesium, Phosphorus, Copper and Selenium.