Heart disease. Some studies suggest that alpha-linolenic acid, which is found in flaxseed and flaxseed oil, might benefit people with heart disease. Early research also suggests that flaxseed might help lower high blood pressure, which plays a role in heart disease.
Cholesterol levels. Several studies show that taking flaxseed daily can reduce total cholesterol and low-density lipoprotein (LDL, or "bad") cholesterol levels. However, other studies aren't as favorable.
Diabetes. Taking flaxseed might lower blood sugar levels in people with type 2 diabetes. However, the same results haven't been found for flaxseed oil.
Menopausal symptoms. Results have been mixed when it comes to use of flaxseed and the treatment of menopausal symptoms.
Safety and side effects
When taken in recommended amounts, flaxseed and flaxseed oil are generally safe to use. However, when taken in large amounts and with too little water, flaxseed can cause:
Bloating
Gas
Diarrhea
Avoid use of flaxseed and flaxseed oil during pregnancy.
Occasionally, using flaxseed or flaxseed oil causes an allergic reaction.
Don't eat raw or unripe flaxseeds.
Because flaxseed oil might decrease blood clotting, stop using flaxseed oil two weeks before having elective surgery.
The evidence is mixed as to whether flaxseed or flaxseed oil has any effect on the prostate or the risk of prostate cancer.
