Print This Post Print This Post

7 Reasons To Take Take Grape Seed Extract

Written by Wellness Club on July 10, 2009 – 1:43 pm -

7 Reasons To Take Take Grape Seed Extract

by Dr. Dana Myatt

Grape seed extract is on my list of “must take” supplements.” Here’s why.

Grape Seed Extract Lowers Risk of Heart Disease

Proanthocyanidin (OPC), a powerful antioxidant found in grape seeds, grape skins, strawberries and French maritime pine bark, has anti-inflammatory properties which have been shown to promote normal blood flow and thus benefit the cardiovascular system. In Doctor Myatt’s words, OPC’s prevent “blood sludge” that can cause strokes and heart attacks. OPC’s work like aspirin (only better and safer) to prevent abnormal blood clotting. OPC’s may be a superior answer for those who need thinner blood (like people with arrhythmias) as a safer alternative to coumadin. OPC’s are also derived from pine bark (the grape seed extract is slightly more potent and less expensive. You will often see the terms proanthocaynadin, OPC’s, and grape seed extract used interchangeably).

In one study, 38 cigarette smokers were divided into two groups and received either 500 mg of aspirin or 125 mg of Proanthocyanidin. After taking these doses, each subject smoked a cigarette, which is known to increase blood platelet aggregation (blood clumping). After two hours, blood samples were analyzed. Both groups has greatly reduced platelet aggregation, but those in the aspirin group had increased bleeding times while those in the OPC group did not. Other studies in smokers have also shown the anti-aggregation effect of OPC’s.

In another study, 30 people were given Proanthocyanidin and 10 were given placebo. People in the Proanthocyanidin group had significant reduction in blood pressure, capillary (small blood vessel) leakage, and blood vessel inflammation, all risk factors for heart disease. There were no negative side effects or adverse changes in blood chemistries from Proanthocyanidin.

Grape Seed Extract A Boon to Diabetics (and those who don’t want to be diabetics)

Proanthocyanidin benefits the cardiovascular system by decreasing inflammation and improving blood viscosity in both normal and diabetic subjects. These effects can be especially important to diabetics. New research shows that OPC’s have even more benefits for diabetics by helping to lower blood sugar levels and improving microcirculation.

OPC’s were administered to diabetic patients. Leg ulcers (which often result in gangrene and loss of limbs in diabetics) healed 25-29% faster in the group taking OPC’s. This is a significant benefit for diabetic patients and could help prevent loss of limbs that often occurs in diabetes.

OPC’s have also been shown to help lower blood sugar levels. Researchers looked at the effect that Proanthocyanidin has on alpha-glucosidase, an enzyme that breaks down carbohydrates into glucose molecules. In this study, Proanthocyanidin was compared to acarbose, a synthetic drug (sold under the brand name Precose) that inhibits alpha-glucosidase. Proanthocyanidin was found to be 190 times more potent at inhibiting alpha-glucosidase, producing a greater delay in glucose absorption. At higher concentrations, OPC’s greatly slowed the entrance of carbohydrates into the blood stream compared to the drug.

Another study showed that Proanthocyanidin improved the level of microangiopathy (small blood vessel abnormalities) decreased capillary filtration, improved symptoms and reduced edema in 18 out of 18 diabetic patients, with no subjects dropping out of the study due to adverse side effects. There were no improvements seen in the control group.

OPC’s have been shown in French trials to help limit the progression of diabetic retinopathy. In one study, 60% of diabetics taking 150 mg per day of OPCs from grape seed extract had no progression of retinopathy compared to 47% of those taking a placebo.

Another trial including 77 subjects with type 2 diabetes, (half receiving 100 mg of Proanthocyanidin and half received a placebo daily), showed after 12 weeks that subjects in the Proanthocyanidin group had significantly lowered their plasma glucose levels compared to placebo. Proanthocyanidin subjects were also found to have improved artery function. In another trial of 30 type 2 diabetics, researchers found that increasing doses of Proanthocyanidin (doses of 50, 100, 200, and 300 mg) lowered blood sugar levels in a dose-dependent fashion. (The more grape seed extract, the lower the blood sugar levels). Subjects who received 100 to 300 mg of Proanthocyanidin had the most significant lowering of their fasting glucose levels.

Anti-Cancer Effects of Grape Seed Extract

Talc (talcum powder) increases “ovarian neoplastic transformation” (turns cells of the female ovary into cancerous cells). A brand new study showed that Proanthocyanidin blocked this talc-induced cancerous change in ovarian cells. PC’s have also been shown to induce apoptosis (programmed cell death) in breast cancer cells but not in normal breast tissue.

OPc’s reduce four factors know to stimulate cancer cell growth: blood sugar levels, insulin levels, free radical and inflammation. This means that OPC’s may be a potent factor not only in cancer prevention but also in cancer treatment. (See our medical paper on cancer diet and nutrition for cancer for full details).

But Wait! There’s More! (More Benefits of Grape Seed Extract)

If heart-protective, anti-diabetic, anti-cancer effects aren’t enough to make you consider adding grape seed extract to your supplement regimen, here are a few more benefits of this amazing flavonoid for you to consider:

* anti-allergenic (grape seed stabilizes histamine release and so acts as a natural anti-histamine, without any drowsy side-effects). Asthmatic children who took Proanthocyanidin were able to decrease their asthma medications.

* improves skin elasticity by increasing collagen in the skin. For this reason, OPC’s are often used in skin rejuvenation programs.

* prevents varicose veins by strengthening blood vessels and increasing collagen (same reason it helps improve aging skin).

* helps prevent Alzheimer’s disease by blocking the formation of beta amyloid (a protein associated with Alzheimer’s).

* Reduces symptoms of endometriosis. This is JUST IN today in Family Medicine journal, yet another study showing positive benefit.

I Don’t Know About You, But…

The proven (but non-FDA-approved, blessed or verified) effects of grape seed extract (aka Proanthocyanidin, OPC’s etc.) are just too great for me to overlook. I personally take 100mg, 3 times per day with meals and will continue to do so. The new research coming out on this important herb convinces me that I’ve made a good decision. Learn more about Grape Seed Extract here.

* The term “pycnogenol” originally denoted the generic proanthocyanidin (OPC) extracts derived from pine bark as researched by Jacques Masquelier, Ph.D.  However, Pycnogenol® is now a registered trademark of Horphag Overseas Ltd., referring specifically to their brand of maritime pine extract. Jacques Masquelier, Ph.D., the original discoverer of OPC’s, initially researched maritime pine as the source of proanthocyanidins. 

In 1951, Professor Masquelier patented a method of extracting OPC’s from pine bark, and in 1970 used this same technique to extract OPC’s from grape seed.


1.)Inhibition of smoking-induced platelet aggregation by aspirin and pycnogenol. Thromb Res. 1999 Aug 15;95(4):155-61.
2.) Pine bark extract reduces platelet aggregation. Integr Med. 2000 Mar 21;2(2):73-77.
3.) Single and multiple dose pharmacokinetics of maritime pine bark extract (pycnogenol) after oral administration to healthy volunteers. BMC Clin Pharmacol. 2006 Aug 3;6:4.
4.) Inhibition of COX-1 and COX-2 activity by plasma of human volunteers after ingestion of French maritime pine bark extract (Pycnogenol). Biomed Pharmacother. 2006 Jan;60(1):5-9. Epub 2005 Oct 26.
5.) Diabetic ulcers: microcirculatory improvement and faster healing with pycnogenol. Clin Appl Thromb Hemost. 2006 Jul;12(3):318-23.
6.) Oligomeric procyanidins of French maritime pine bark extract (Pycnogenol) effectively inhibit alpha-glucosidase. Diabetes Res Clin Pract. 2006 Nov 10.
7.) Rapid relief of signs/symptoms in chronic venous microangiopathy with pycnogenol: a prospective, controlled study. Angiology. 2006 Oct-Nov;57(5):569-76.
8.) Procyanidolic oligomers in the treatment of fragile capillaries and diabetic retinopathy. Med Int 1981;16:432–4 [in French].
8.) Retinopathies and OPC. Bordeaux Medicale 1978;11:1467–74 [in French].
9.) Contribution to the study of procyanidolic oligomeres: Endotelon in diabetic retinopathy (in regard to 30 observations). Gaz Med de France 1982;89:3610–4 [in French].
10.) Antidiabetic effect of Pycnogenol French maritime pine bark extract in patients with diabetes type II. Life Sci. 2004 Oct 8;75(21):2505-13.
11.) French maritime pine bark extract Pycnogenol dose-dependently lowers glucose in type 2 diabetic patients.Diabetes Care. 2004 Mar;27(3):839.
12.) Pycnogenol reduces talc-induced neoplastic transformation in human ovarian cell cultures.Phytother Res. 2007 Mar 14; [Epub ahead of print]
13.) Selective induction of apoptosis in human mammary cancer cells (MCF-7) by pycnogenol. Anticancer Res. 2000 Jul-Aug;20(4):2417-20.
14.) Nutritional and Botanical Considerations in the Systemic Treatment of Cancer: 2006 Update.
15.) Pycnogenol as an adjunct in the management of childhood asthma. J Asthma. 2004;41(8):825-32
16.) Stabilization of collagen by polyphenols. Angiologica 1972;9:248–56 [in German].
17.) Non-enzymatic degradation of acid-soluble calf skin collagen by superoxide ion: protective effect of flavonoids. Biochem Pharmacol 1983;32:53–8.
18.) Pycnogenol protects neurons from amyloid-beta peptide-induced apoptosis. Brain Res Mol Brain Res. 2002 Jul 15;104(1):55-65.
19.) Pine Bark Extract Reduces Symptoms of Endometriosis. J Reprod Med. 2007;52:000-000.

Print This Post Print This Post
SocialTwist Tell-a-Friend

Posted in Cancer, Diabetes, Family Health, Heart and Circulation, Nutrition and Health | No Comments »

You must be logged in to post a comment.

Disclaimer: These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. No information on this website is intended as personal medical advice and should not take the place of a doctor's care.