For muscular performance For muscle function and mental performance in sport, Magnesium Energy from Pure Encapsulations provides the minerals magnesium and potassium, sodium bicarbonate, vitamin B 12 and taurine. Magnesium and vitamin B 12 contribute to normal energy metabolism and to the reduction of fatigue. The nutrient formula contains magnesium in the tolerable citrate and glycinate form - ideal for active athletes. The American Low Value Shipment Regulatory Modernization Act is active since March 2016 and increases the duty and tax free value of goods American citiziens could import from other countries by mail from $200 to $800 as well as no formal customs procedures are required. The American Low Value Shipment Regulatory Modernization Act is active since March 2016 and increases the duty and tax free value of goods American citiziens could import from other countries by mail from $200 to $800 as well as no formal customs procedures are required