Fennel Seeds | Sombu / SaunfPremium Quality Fennel Seeds Sombu Saunf Potassium present in fennel seeds helps in regulating the blood pressure, has been found to be highly effective in the treatment of asthma. Fennel seeds are very helpful in reducing menstrual pains and menopausal symptoms. A consumption of fennel seeds before the onset of periods reduces period pain. Improves Breast Milk Production.