The taboo is not to talk about, but barley and other kinds of not often with. The efficacy of its not stacked ah.
1) black rice, black sesame, jujube, walnuts: often put together to beat the powder, nourishing the liver and kidneys, kidney hair, beauty, blood longevity, brain benefit.
2) Job's tears: mainly to dispel dampness and strengthen the spleen, usually and red beans or yam or gorgonzola powder together, in order to play its maximum effect.