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There are essentially two types of Qust, Indian (Qust al Hindi) and Marine/Sea (Qust al Bahri)
Al-Qust Al-Bahri which is a white kind of costus which used to be brought from India to the Arab Peninsula in ships across the sea and that is why it was called sea costus)
An-Nawawi said, “Physicians unanimously agreed in their books that sea costus increases urine and menstrual flow, is beneficial against poison, enhances sexual desire, kills worms…etc.” As regards whether it needs to be mixed with black seeds for the purpose that you mentioned in the question, then this matter could only be determined by people who are experienced in treating with herbs.
There is another kind of costus that is called the Indian costus which differs in some of characteristics from the sea costus. Ibn Al-Qayyim said in Zaad Al-Ma’aad, “There are two kinds of costus: the white kind that is called sea costus and the Indian costus which has the hottest nature among them, while the white type is the mildest. Both kinds have numerous benefits.”
Qust is hot and dry in the third degree and helps to dry out excess phlegm, help to remedy colds and influenza and nasal congestion. Imam Ibn Al Qayyim said that drinking an infusion of Qust helps strengthen the liver and helps to remedy weakness of digestion, slackness of the stomach, and if used as an ointment, it helps backache or rheumatic pain in the lumbar region.
Sea/Marine Qust is a little paler in colour and also milder in taste and more suitable for administering to children