Royal Jelly is the substance found at the bottom of all brood cells. It may be used in beekeeping to supercharge a potential queen cell prior to transferring the larva. Royal jelly consists of equal ammounts of mandibular gland (milky white) and hypopharyngeal gland (clear). They are both high in proteins. the mandibular gland component contains a lipid 10-hydroxy-2-decanoic acid (10-HDA).
Scientific Beekeeping does not support the extraction of royal jelly for any cosmetic or dubious "Health" claims.
Chemical Composition and Antimicrobial Activity of Royal Jelly - Review
By Waugsberg - Own work,
Queen larvae swimming in royal jelly