Is siwutang effective in conditioning complexion?

Siwutang is composed of four Chinese medicines: Angelica sinensis, Ligusticum Chuanxiong, Radix Paeoniae Alba and Radix Rehmanniae Preparata, among which Angelica sinensis and Radix Rehmanniae Preparata are the main medicines. Radix Rehmanniae Preparata contains mannitol, vitamin A, etc. When it is compatible with Angelica sinensis, it can increase the content of ferulic acid, the main component of Angelica sinensis, enhance the curative effect of nourishing blood and promoting blood circulation, and can cope with the symptoms of pale face and dizziness of women.

Siwutang is a classic prescription for enriching blood and nourishing blood. It is especially good for women, and it won't grow acne after drinking for a long time.

As far as I know, Siwu Decoction is not specifically aimed at dull complexion, but mainly regulates liver blood, which is the basic prescription for enriching blood. When a woman has good blood, she is beautiful from the inside out. Her face is ruddy, how can it be dark yellow?