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Bees rely on the powdery stuff for food. Some companies sell and promote ''bee pollen'' as a good source of food for humans, also. Supporters say bee pollen is more than mere food, however. They also claim it has medicinal value - as a treatment for hay fever, ulcers, colds and infections. Eric Gershwin, professor and chief of the Division of Rheumatology and Allergy at UC Davis, says that the pollen collected by bees contains allergens.