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Hawthorn also seems to have blood pressure-lowering activity, according to early research. It seems to cause relaxing of the blood vessels farther from the heart. It seems that this effect is due to a component in hawthorn called proanthocyanidin.
Research suggests that hawthorn can lower cholesterol, low density lipoprotein (LDL, or "bad cholesterol"), and triglycerides (fats in the blood). It seems to lower accumulation of fats in the liver and the aorta (the largest artery in the body, located near the heart). Hawthorn fruit extract may lower cholesterol by increasing the excretion of bile, reducing the formation of cholesterol, and enhancing the receptors for LDLs. It also seems to have antioxidant activity.
In some people, hawthorn can cause nausea, stomach upset, fatigue, sweating, headache, dizziness, palpitations, nosebleeds, insomnia, agitation, and other problems.
Special Precautions & Warnings:Pregnancy and breast-feeding: Not enough is known about the use of hawthorn during pregnancy and breast-feeding. Stay on the safe side and avoid use.
Heart disease: Hawthorn can interact with many prescription drugs used to treat heart disease. If you have a heart condition, don't use hawthorn without the recommendation of your healthcare provider.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.