Buy 1 Optimum Nutrition Essential AmiN.O. Energy (30 serv.) at Bodybuilding.com, Get 1 50% Off! Shop Now! Another great Amino supplement from ON that last and lasts because 2 scoops is considered one serving....when all you really need is 1 scoop and flavours are awesome...it's a drink you can drink all day...breakfast...pre workout...post workout...pick me up in the afternoon