Queen bee acid

The queen bee acid (10-hydroxy-2-decenoic acid) or 10-HDA is a bio-active compound found in royal jelly.
Royal jelly acid is being investigated for its pharmacological activities. Reports indicate that it promotes neurogenesis of neural stem/progenitor cells (cells capable of differentiating into neurons, astrocytes, or oligodendrocytes) "in vitro" and could provide an effective method to treat and prevent neurological disorders.
In addition, royal jelly acid has been reported to have anti-tumor, anti-biotic, immunomodulatory, estrogenic, neurogenic, and innate immune response modulating activities.
In the United States, the Food and Drug Administration has taken legal action against companies that have used unfounded claims of health benefits to market royal jelly products.
References.
9. Royal Jelly Uses, Side Effects & Warnings 
https://www.drugs.com/mtm/royal-jelly.html
Medically reviewed by Drugs.com on Sep 29, 2020. Written by Cerner Multum.