Ginseng is a traditional plant in Chinese medicine because it includes pharmaceutical ginsenosides that have been used in Asia for thousands of years. Ginsenosides are triterpenoids, a class of natural products mainly present in Panax species (e.g., Panax ginseng, P. notoginseng, and P. quinquifolium). However, due to the shortcomings of chemical synthesis and extraction from plants, the synthesis of ginsenosides by microbial cell factories, which has the advantages of environmental friendliness, high efficiency, convenience, and potentially low cost, has received much attention in recent...