Historically, black seed has been used for headache, toothache, nasal congestion, and intestinal worms. It has also been used for “pink eye” (conjunctivitis), pockets of infection (abscesses), and parasites.
Today, black seed is used for treating digestive tract conditions including gas, colic, diarrhea, dysentery, constipation, and hemorrhoids. It is also used for respiratory conditions including asthma, allergies, cough, bronchitis, emphysema, flu, swine flu, and congestion.
Other uses include lowering blood pressure, lowering cholesterol levels, treating cancer, and boosting the immune system. You may read that a patent has been issued to cover the use of black seed to improve immunity, but don't be misled. The presence of a patent doesn't mean black seed has been shown to be effective for this use