<p>Zhen Quan said, &ldquo;The root of Ma Huang can stop sweating.&rdquo; I found this to be untrue. Zhang Zhongjing said, &ldquo;Ma Huang should be cooked first and the foam (to be) removed from the top.&rdquo; Ma Huang imported from China has no foam and can be cooked with other herbs. Ma Huang should be grated before use.</p>
