Bee bread is pollen packed into a cell with nectar, honey and bee secretions — the colony's stored protein, eaten by nurse bees to make the food they feed larvae. It is often said to be fermented into something more digestible; a 2014 study found little evidence of that, so treat the fermentation story as contested. It is not the same thing as the bee pollen sold as a supplement.

What is bee bread?

How it is made

CollectionA forager packs pollen into the corbicula on her hind legs, moistening it with nectar to make it stick.
DepositShe pushes the pollen loads off into a cell near the brood. She does not pack them down herself.
PackingA house bee packs the pollen tightly with her head, adds nectar and glandular secretions, and seals the cell surface with a film of honey.
StorageThe packed, honey-sealed mass keeps in the cell. Whether lactic acid bacteria ferment it significantly is disputed — see below.
Storage and useNurse bees eat it and convert it into brood food. Bees prefer to eat pollen stored for under three days when they can, so much of it is used fresh.

Is it really fermented?

The standard account says lactic acid bacteria ferment stored pollen over about a week, softening the tough grain walls and making protein more accessible. It is repeated widely, including on many beekeeping sites. A 2014 study led from a USDA research centre tested it directly and did not find support: freshly collected pollen carried few bacteria, the numbers fell rather than rose over four days of storage, the stored and fresh pollen carried the same bacterial community, the estimated ratio of microbe to pollen-grain surface was about one to a million, and the grains did not look degraded. Its authors concluded that the cell preserves pollen — through the honey, nectar and bee secretions added to it and the properties of pollen itself — rather than converting it. HoneyHQ treats the fermentation claim as contested until the two lines of evidence are reconciled.

What it is for

Protein. A colony's entire brood is built from pollen, and bee bread is how that protein is stored between flows. Nurse bees eat it and convert it into the brood food they secrete from their head glands, which is what larvae actually receive.

A colony without stored pollen stops rearing brood within days. This is why pollen availability in early spring is the binding constraint on colony growth and why a pollen dearth is more urgent than a nectar dearth.

Should people eat it?

Bee bread is sold in small quantities as a supplement, at high prices. It has a genuine protein content, and the same caveats apply as to bee pollen: the health claims run well beyond the evidence, and people with pollen allergies or asthma are at real risk of reacting.

There is also a straightforward ethical point. Harvesting bee bread removes the colony's stored protein, which is a more consequential thing to take than surplus honey.