The hypoglycemic effect of Nigella sativa oil is mediated by extrapancreatic actions

Planta Med. 2002 May;68(5):465-6. doi: 10.1055/s-2002-32084.


A plant mixture containing extracts of Nigella sativa possesses blood glucose lowering effects, but the direct antidiabetic effect of Nigella sativa is not yet established. Therefore, the effect of Nigella sativa oil (NSO) on blood glucose concentrations was studied in streptozotocin diabetic rats. In addition, the effect of NSO, nigellone and thymoquinone were studied on insulin secretion of isolated rat pancreatic islets in the presence of 3, 5.6 or 11.1 mM glucose. NSO significantly lowered blood glucose concentrations in diabetic rats after 2, 4 and 6 weeks. The blood lowering effect of NSO was, however, not paralleled by a stimulation of insulin release in the presence of NSO, nigellone or thymoquinone. The data indicate that the hypoglycemic effect of NSO may be mediated by extrapancreatic actions rather than by stimulated insulin release.

Publication types

  • Letter

MeSH terms

  • Animals
  • Benzoquinones / pharmacology
  • Blood Glucose / drug effects
  • Blood Glucose / metabolism
  • Diabetes Mellitus, Experimental / blood
  • Dose-Response Relationship, Drug
  • Female
  • Glucose / pharmacology
  • Hypoglycemic Agents / pharmacology*
  • Insulin / metabolism
  • Insulin Secretion
  • Male
  • Pancreas / cytology
  • Pancreas / drug effects*
  • Pancreas / metabolism
  • Plant Oils / pharmacology*
  • Rats
  • Rats, Wistar


  • Benzoquinones
  • Blood Glucose
  • Hypoglycemic Agents
  • Insulin
  • Plant Oils
  • nigellone
  • caraway oil
  • Glucose
  • thymoquinone