Yam (Dioscorea opposita Thunb.) often has kidney-shaped or ovoid beads between its axils, and its name "Reiyoshi" is also called yam seed, commonly known as "yam bean, yam egg", which has a tonic effect.
Its function is roughly the same as that of yam: invigorating lung and qi, invigorating spleen and deficiency, consolidating kidney and replenishing essence, nourishing heart and tranquilizing mind, strengthening ambition and increasing wisdom, nourishing blood, calming cough and asthma, and prolonging life.
Yam bean is the beaded bud on the yam vine, which is born on the leaves and has different oblong shapes; The skin is yellow, turns gray after cooking, with thin skin and fine white meat. Yam bean is sweet in taste and flat in nature, and enters the three meridians of spleen, lung and kidney, which can nourish lung, benefit yin, tonify kidney and solidify essence.