Simple System Sainfoin Brix. Sainfoin is a premium forage alternative to lucerne and grass. Known as healthy hay, Sainfoin has long been recognised for its many benefits. Our Sainfoin is rich in natural minerals and trace elements. They are a good source of condensed tannins, which aid digestion of protein. Sainfoin is suitable for all horses, and can be very beneficial when fed with hay and grass as a nutritious alternative and to add a variety of flavour. Composition 100% pure Sainfoin Major Minerals Calcium % 0.97 Phosphorus % 0.21 Sodium % 0.02 Potassium % 1.64 Magnesium % 0.15 Chloride % 0.44 Sulphur % 0.14 Minor Minerals Copper mg/kg 3 Manganese mg/kg 46 Zinc mg/kg 16 Iron mg/kg 556 Selenium mg/kg <0.01