what is wild yam used for

{"cid":"91155470","title":"100% Natural Diosgenine Wild Yam Herb Extract Diosgenine powder","imgUrl":"https:\/\/img.chinax.com\/nimg\/9a\/34\/cd39cd9a33ec1be2531a5ada8881-200x200-1.jpg","attrs":{"Price":"USD 1 PER KG","Brand Name":"Greenspring","Model Number":"GSP106","Minimum Order Quantity":"1kg","Delivery Time":"Within 3working days after payment","Certification":"Kosher and ISO certification","Place of Origin":"CHina","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union","Supply Ability":"1000kgs per month","Packaging Details":"1kg\/bag, Sterilization double plastic bags inside, with aluminium foil bag outside; 25kg\/fiber drum","Name":"Wild Yam Herb Extract Diosgenine powder","Content":"16% Diosgenine powder","Appearance":"White fine powder","Used parts":"Stem or Root","Method":"HPLC"}}

{"cid":"91110306","title":"Industrial Food Dryer \/ Industrial Food Drying Machine \/ Industrial Fruit Dehydrator","imgUrl":"https:\/\/img.chinax.com\/nimg\/fa\/67\/2989a3ba787186cdd558187e4fd0-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"LTPM China","Model Number":"LTDG-Series","Minimum Order Quantity":"1 Set","Delivery Time":"30 Days","Certification":"CE","Place of Origin":"China","Payment Terms":"L\/C, T\/T","Supply Ability":"15 Set\/Month","Packaging Details":"Export Standard Wooden Case","Weight":"1750kgs","Lyophilizing acreage(m2)":"0.4","Dry Area":"1.08 square meter","Tray Area":"1.02 square meter","The Total Volume of dehydration":"20 kg\/batch","Shelf Spacing":"70 mm","Heating mode":"Conduction mode","External dimension(mm)":"1880*950*950"}}