The bay leaf is an aromatic leaf commonly used in cooking. It can be used whole or in a dried or ground form. Bay leaves are a rich source of vitamin A, vitamin C, iron, potassium, calcium, and magnesium. They have been proven to be useful in the treatment of migraines. They have been proven to be useful in the treatment of migraines. Bay leaves are NOT dangerous to eat. … However, even after hours of cooking, the bay leaf remains very rigid and stiff. Swallowing a large piece could cause you to scratch your digestive tract or potentially (although rare) pose a choking hazard. In summary, bay leaves reduced serum glucose, total cholesterol, LDL cholesterol and triglycerides, and increased HDL cholesterol levels in people with type 2 diabetes.