Shennong tasted hundreds of grasses and found herbs during the legend period. The appearance of prescription should be so early if single drug was regarded as single-item recipe.

Shennong ever suffered 72 poisons in trying herb medicines and tea is the detoxifcation for him, which is the earliest record of tea by our ancestors.

PRIMITIVE COMMUNES  Tea was discovered by human during the B. C. 28 century the Chinese Shennong Time.  the Herbal Lection by Shennong quotes : I tasted many herbs and was poisoned. tea healed me.