Hi all
I am skeptical that a decent substitute for pollen can be found or made, any more than there is a decent substitute for turkey and apple pie at Thanksgiving. To wit:

To have equated pollen with protein as effectively as had been done in the experiments
of Goetze and Bessling (1959) and Freudenstein (1960), recalls the
admonition of De Groot (1953): more is known of the foodstuffs than of the
nutritional requirements of bees. The fact that not a single pollen substitute
(chosen on the basis of its apparent protein value) gave the same result as bee-collected
pollen makes one wonder whether there is something more to pollen that still eludes us.

Hepburn, H. R., Pirk, C. W. W., & Duangphakdee, O. (2014). The Role of Pollen in Honeybee Colonies. In Honeybee Nests (pp. 145-173). Springer Berlin Heidelberg.

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