We know that 10 HDA is an essential measurement of royal jelly and its potency/quality. Studies have shown that royal jelly may have estrogen-like effects and the 10-HDA components may be significant to this.
“Royal jelly (RJ) excreted by honeybees and used as a nutritional and medicinal agent has estrogen-like effects, yet the compounds mediating these effects remain unidentified. The possible effects of three RJ fatty acids (FAs) (10-hydroxy-2-decenoic-10H2DA, 3,10-dihydroxydecanoic-3,10DDA, sebacic acid-SA) on estrogen signaling was investigated in various cellular systems.”
In fact it appears that this substance has an impact on hormones in both males and females. In men, it may have the capacity to increase testosterone production and in women, the production of estrogen.
If you need to dig a little deeper into these effects then the following may be useful –