بسم الله الرحمن الرحيم
Q: With regards to black seed, is mixing it with food reported in an authentic narration? We have read this in some publications and as a result we hope to seek counsel from you as it relates to this.
A: It is (authentically) reported that contain therein is a cure for all ailments except death consequently there is no doubt with regards to it. Therein is a cure just as the Prophet -sallahu alayhi wa salaam- informed us. As for how to apply it, this is up to the discretion of an individual. He can put it in his drink, his food, or swallow it and wash it down with water.
Translated by Najeeb Al Anjelesi
Source: http://www.alfawzan.af.org.sa/node/2534