Nutrients: Calcium, iron, magnesium, manganese, phosphorus, potassium, selenium, silicon, zinc, vitamins B1, B2, B3 and C. Drug Interactions: Interacts with: Loop Diuretics, Spironolactone, Thiazide, Diuretics and Triamterene. Description: Shavegrass is a storehouse of silica. Silica is needed for the absorption of calcium in the body. It helps to check fatty deposits in the arteries… . . . → Read More: Shave Grass (Equisetum arvense)