| Summary: | Nigella sativa (black seeds) is a very famous and popular herb used for centuries in many communities. N. sativa has been shown to possess therapeutic potential to many illnesses. Hypoglycemic effect of N. sativa has been studied extensively in the literature. This review gathered and analyzed the results reported in the literature related to the hypoglycemic effect of N. sativa. A search was done for N. sativa and black seeds as key words in PubMed and Google scholar databases. Published studies document a hypoglycemic effect of N. sativa in normal and diabetic animals and humans. Volatile oil and thymoquinone seem to be the most effective fractions of the seed in producing its hypoglycemic effect. The mechanism of N. sativa hypoglycemic effect is multifactorial including increasing insulin level, decreasing insulin resistance, stimulating β cells activity, direct insulin-like effect, and decreasing intestinal glucose absorption. Further, basic followed by clinical research to explore N. sativa ingredient responsible for its promising hypoglycemic effect is recommended.
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