Royal Jelly is a thick, creamy fluid synthesized in nurse bees' bodies during digestion of bee pollen and secreted from glands in their heads. All larvae are fed royal jelly for three days, but the queen bee eats royal jelly exclusively, which makes her fertile and able to live for five to seven years. In contrast, worker bees are sterile and live just seven to eight weeks. Royal jelly has a reputation for maintaining youthfulness in humans, but research, while encouraging, lags behind that for other hive products.