Rapunzel, corn salad or lamb’s lettuce – no other variety has as many names as the popular field salad. And the name speaks for itself: It comes straight from the fields. This is a great leafy vegetable to include in your diet because it contains valuable nutrients such as vitamin A, vitamin C and folic acid as well as iron, potassium, calcium, magnesium and phosphorus. But you shouldn’t enjoy this salad too often. It contains quite a lot of oxalic acid. This acid is considered a “calcium scavenger” because it binds the mineral and prevents it from being stored in bones and teeth.
Metabolic Balance Blog 