Table 1.

Active compounds and elements isolated from Nigella sativa seeds and their percentages.

Compound and Elements	Percentages
Thymoquinone	30–48%
Thymohydroquinone, dithymoquinone, p-cymene	7–15%
Carvacrol	6–12%
4-Terpineol	2–7%
t-Anethol	1–4%
Longifolene (a sesquiterpene)	1–8%
Nigellicimine, nigellicimine-N-oxide, nigellidine, nigellicine, α-hederin, saponin, carvone, limonene, citronellol	<1% (trace amounts)
Minerals (calcium, potassium, magnesium, aluminum, copper, phosphorus, zinc, iron, manganese)	<1% (trace amounts)