Four-substance decoction, recorded in the Song-dynasty 《
太平惠民和剂局方》, contains four herbs:
当归 (dāngguī, Chinese angelica),
川芎 (chuānxiōng, Sichuan lovage),
白芍 (báisháo, white peony) and
熟地黄 (shúdìhuáng, prepared rehmannia). It is the foundation formula for tonifying blood (
补血), especially for women's health.
