Mann Lake sells a product called Super DFM-Honeybee.  It is claimed to have multiple benefits including:
"Safe bacteria designed to help the honeybee suppress pathogens Establish beneficial microflora Helps increase bee colony health May help inhibit chalkbrood (Ascophera apis) Microflora have a positive effect on vitellogenin (fat body) formation (The health of honey bee colony is dependent upon vitellogenin reserves of the nurse bees) Yeasts help synthesize B-vitamins needed for bee health."
Does anyone know of any evidence based studies as to its effectiveness in any of these areas?
Brion
 > no evidence based study but I tried it for 2 years. No noticeable differences between treated and untreated hives. [about 30 hives in the test in 2 yards.] Another beekeeper reported that he had an increase of nosema in treated hives. Felt it was snake oil. 

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