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.*