Herbs that Cool the Blood

What is the recommended dosage of Shui Niu Jiao (bubali cornu) when used in decoction?

Shui Niu Jiao is a horn. Like heavy minerals, it has a larger dosage. You can also swallow 6-15 grams as a powder.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 118 [Q379]