Given the rising epidemic of diabetes and its devastating complications, natural strategies that support healthy blood sugar (glucose) and protect against oxidative stress offer hope for many individuals.
Metabolic syndrome-a combination of risk factors such as insulin resistance, high blood pressure, high triglycerides, and low high-density lipoprotein (HDL)-increases one’s risk for diabetes and cardiovascular disease.
Widely known as a potent and effective antioxidant, lipoic acid demonstrates a multitude of unique properties.
Regulated as a drug in several European countries (where it is approved for the treatment of diabetes-related complications, certain complications of alcoholism, and a variety of liver conditions),1,2 lipoic acid is an important component of every informed individual’s health maintenance regime.
In emerging research, lipoic acid has shown impressive benefits in the context of glaucoma, migraine, stroke, as well as bone health.
Protection Against Oxidative Stress
One of the underlying problems in diabetes is oxidative stress and the production of free radicals. These free radicals circulate in the body, attacking and damaging tissues. Since people with diabetes have high glucose levels, they are more prone to oxidative stress, which may contribute to the long-term complications of the disease.
Antioxidants such as lipoic acid prevent this damage by neutralizing free radicals and reducing oxidative stress.3,4 Lipoic acid is an unusual antioxidant because it can act in both water-soluble and fat-soluble domains in cells and tissues. Thanks to these qualities, it is easily absorbed and transported into many organs and systems within the body, for example, the brain, liver, and nerves. Contrast this with antioxidants such as vitamin C, which is not very lipid-soluble (so is not able to penetrate the lipid wall of cell membranes very well), or vitamin E, which is not very water-soluble. When lipoic acid is combined with these antioxidants, the body’s ability to fight free radicals is greatly increased. In fact, lipoic acid helps to regenerate vitamins C and E.2
Furthermore, lipoic acid helps amplify the positive effects of other important antioxidants in the body such as glutathione and coenzyme Q10-two essential compounds in the fight against aging and disease.5 It also teams with the B-vitamin family to support energy production in the body by converting the components of food, namely carbohydrates, proteins, and fats, into stored energy for future use. Lipoic acid does this by helping to protect mitochondria, the energy-producing factories of cells, from being damaged by oxidative stress, thus ensuring that energy production in the body remains efficient.1
Metabolic Syndrome and Diabetes
Overwhelming evidence now suggests that lipoic acid may be critical for not only maintaining optimal blood sugar levels by helping the body to use glucose, but also for supporting insulin sensitivity and key aspects of cardiovascular health, such as endothelial function.
According to a just-released review of experimental studies, lipoic acid can help relieve several components of metabolic syndrome-a constellation of risk factors that often precedes full-blown types 2 diabetes. This review revealed that lipoic acid reduces blood pressure and insulin resistance, improves the lipid profile, and reduces weight. Scientists are encouraged by lipoic acid’s potential as a therapeutic agent for individuals with metabolic syndrome.6
Furthermore, another recent study of 36 patients with coronary artery disease found that a combination of lipoic acid with acetyl-L-carnitine reduced blood pressure and improved endothelial function of the brachial artery.7 This nutrient pair may therefore be an effective strategy for supporting healthy blood pressure levels, particularly in the context of metabolic syndrome.
Just last year, investigators revealed dramatic effects of administering lipoic acid in improving insulin sensitivity in overweight adults suffering from type 2 diabetes. Lipoic acid produced significant improvements in a very short time frame-only four weeks of supplementation.8 This finding could have important implications, as insulin resistance lies at the heart of type 2 diabetes.
Even after complications of diabetes have manifested, lipoic acid offers help. It has been found effective in the treatment of diabetic neuropathy, a type of nerve damage that occurs as a result of the toxic effects of high glucose levels on the nervous system in diabetes. Diabetic neuropathy is characterized by numbness, tingling, and pain best described as “burning” in the extremities.9
A large, randomized, placebo-controlled, multicenter, double-blind study involving 328 patients with type 2 diabetes revealed that lipoic acid significantly improved symptoms of diabetic neuropathy, including sensations of burning, tingling, itching, and pain.9 Although this early study was carried out using intravenous infusions of lipoic acid, later research has shown oral lipoic acid supplements to also be effective. Just five weeks of oral supplementation with lipoic acid significantly improved the stabbing pain, burning pain, and numbness of the feet in patients suffering from diabetic neuropathy, with the dose-effectiveness range being 600-1,800 mg of lipoic acid dosed orally per day.10 The dose of R-lipoic acid to achieve this effect in diabetics would be half this amount, since it is the “R” form of lipoic acid that is biologically active in the body.
Promoting Better Eye Health
Lipoic acid offers promise in supporting optimal visual health.
As adults grow older, they become more vulnerable to developing cataracts, opacities of the lens that cloud sight. A key problem involved in cataract formation is oxidative stress in the lens of the eye. Lipoic acid was found to offer notable protection against cataract formation in an experimental animal model. Scientists believe that lipoic acid may confer this benefit by increasing levels of essential endogenous antioxidant enzymes such as glutathione peroxidase.11
Another common cause of vision loss is glaucoma. A study in patients with open-angle glaucoma found that visual function and other measures of glaucoma were improved in a group that received either 75 mg of lipoic acid daily for two months or 150 mg of lipoic acid daily for one month, compared with a control group that received no lipoic acid.12
Furthermore, a recent study revealed that the combination of lipoic acid and vitamin E helped prevent retinal cell death in animals with retinitis pigmentosa, an eye disease that also affects humans. As there is currently no effective medical treatment for this vision-robbing disease, the discovery of a nutritional approach to potentially treat retinitis pigmentosa is amazing news indeed.13
Given its strong ability to neutralize the damaging effects of oxidative stress, lipoic acid is the subject of intense study in preventing free radical damage to the neurological system.14
Lipoic acid is able to pass readily into the brain and reach all parts of a nerve cell. Experimental studies have shown that lipoic acid reduced brain damage after a stroke, and that those animals who received lipoic acid had a survival rate three times greater than those that did not.15 Some of the protective effects conferred by lipoic acid in promoting healthy nerve function may be related to its ability to regenerate the antioxidant glutathione, which is often significantly depleted by harmful oxidative stress associated with cerebrovascular events such as stroke.
New evidence also suggests that lipoic acid may help guard against one of the most dreaded conditions associated with aging-Alzheimer’s disease. Researchers have identified a series of mechanisms through which lipoic acid may work in helping prevent or manage Alzheimer’s disease.16 Scientists believe that lipoic acid may increase the production of acetylcholine, an essential nervous system messenger that is deficient in the brains of Alzheimer’s disease victims.
In addition, preliminary works suggests that lipoic acid might be useful in those affected by multiple sclerosis. Investigators found that lipoic acid supplementation improved a variety of inflammatory measures that are associated with the disease.17 Further evidence also showed that lipoic acid supplementation produced improvements in animals suffering from an experimentally induced form of multiple sclerosis.18
Preserving Bone Density
Another area in which lipoic acid holds promise is in averting the bone loss that accompanies osteoporosis and other degenerative bone conditions. This multifaceted agent may help preserve bone health by quelling the oxidative stress that threatens to degrade healthy bone density.
When applied to bone marrow cells and osteoblasts (bone-forming cells) in the laboratory, lipoic acid suppressed the formation of bone-degrading osteoclast cells in a dose-dependent fashion.19,20 It also reduced the process of inflammation-induced bone loss in both laboratory and living systems.19 Scientists believe that lipoic acid’s ability in preventing the loss of bone is linked to its inhibitory effects on pro-inflammatory prostaglandin E2 and the inflammatory cytokine tumor necrosis factor-alpha.20,21
These promising preliminary findings suggest a therapeutic role for lipoic acid in preventing and managing osteoporosis and other conditions that threaten bone density.