This review's own materials are direct about this specific pair: their inclusion rests more on traditional use than on modern clinical data.
Wild Yam contains diosgenin and has a long history in traditional preparations aimed at strength, stamina and recovery, while Sarsaparilla root has traditionally been used as a tonic contributing saponins and antioxidant compounds.
Modern evidence for the whole-herb extract is thinner than for Tongkat Ali or Saw Palmetto — worth reading these two ingredients as supporting rather than headline, and weighing that honestly against any marketing language that treats all seven ingredients as equally proven.
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