What is the effect of the preparation of polygonum multiflorum

Yishen, Yixinxue, laxative. Radix polygoni multiflorum after brewing, reduce toxicity. At present, the quality of Radix polygoni multiflorum has declined, ancient use of black bean juice and raw Radix polygoni multiflorum together steamed, steamed and dried, repeated nine times, can reduce the side effects and toxic reactions of Radix polygoni multiflorum.