Start feeling better in 14 days or less. SierraSil Joint Formula14™ contains SierraSil®, a pure mineral powder with essential minerals including calcium, iron, silicon, potassium, magnesium, manganese, copper and zinc. Research shows SierraSil Joint Formula14™ supports joint, cartilage and muscle function. SierraSil Joint Formula 14™ also supports gentle detoxification because of its clay mineral structure.