Eu Yan Sang uses Tian Qi root from Yunnan. The root portion contains the main root, branch roots, root hair, root tip etc. When the root is sliced up, the cross section is observed as greenish grey, greenish yellow or greyish white. When the raw herb is ground into powder, the colour of the powder could be anywhere between the above 3 colours. The finer the powder has been ground into, the lighter the colour. As with all natural herbs, Tian Qi will experience a degree of colour variation from batch to batch. That however is not a measure of product quality.

Referencing Ben Cao Gang Mu (本草纲目), the official recognised Compendium of Materia Medica for TCM herbs, the recommended daily dosage for Tian Qi is 3-9g in raw herb-concoction form and 1-3g in ground powder form. In raw herb-concoction form, Tian Qi is cut up into slices and is used for brewing into a herbal concoction, where the liquid is drunk but Tian Qi not directly consumed. In the ground powder form, Tian Qi is ground into fine powder and consumed directly. Following the above recommendation, the instructions for use of this product (Tian Qi Powder) 1gram,once or twice daily with warm water.