Electron microscopy studies show that olfactory glands contain cells with large secretory vesicles.

[3] They might secrete proteins such as lactoferrin, lysozyme, amylase and IgA, similarly to serous glands.

The exact composition of the secretions from olfactory glands is unclear, but there is evidence that they produce odorant-binding protein.

These glands produce mucus to lubricate the olfactory epithelium and dissolve odorant-containing gases.

This article incorporates text in the public domain from page 996 of the 20th edition of Gray's Anatomy (1918)