Liquorice may reduce unwanted hair

https://www.ncbi.nlm.nih.gov/pubmed/26626191

Glycyrrhizin (or glycyrrhizic acid or glycyrrhizinic acid) is the chief sweet-tasting constituent of Glycyrrhiza glabra (liquorice) root. Structurally, it is a saponin used as an emulsifier and gel-forming agent in foodstuffs and cosmetics (from Wikipedia)

The article doesn’t seem to say how it was used to reduce unwanted hair (not ready for prime time I suspect) as shown in these two photos