Dietary Supplements for Parkinson's Disease

Dietary supplements are products that contain a dietary ingredient, such as a vitamin, mineral, amino acid, or herb. Also called nutritional supplements, they are taken by mouth and are intended to add nutritional value to the diet. Many people use dietary supplements for general health and well-being, and people with PD also look to supplements to improve their health.1,2

There are no dietary supplements that have been proven to slow the progression of PD; however, scientists are researching several supplements to understand the role they may play in PD. All supplements should be discussed with a doctor before taking them as they may interfere with PD medications or potentially cause serious side effects.1,2

Coenzyme Q10

Coenzyme Q10 (CoQ10) is an antioxidant (substance that helps clear toxins) that helps the cells obtain energy from oxygen. A recent, large multi-center clinical trial that looked at people with PD taking CoQ10 compared to those taking a placebo showed no benefit of CoQ10, causing the study to be terminated. However, scientists are using the results of this trial to determine if other forms of CoQ10 could be effective or if taking CoQ10 at the early stages of the disease may be helpful.2,3


Creatine is an amino acid that increases levels of phosphocreatine, an energy source for the muscles and the brain. In experimental studies, creatine has shown to protect against nerve cell injury. Some studies have shown creatine may help slow the progression of PD among people in the early stages of the disease. Other studies have not found a benefit of taking creatine for people with advanced stages of PD. One long-term study conducted in multiple centers in the U.S. and Canada evaluated creatine compared with a placebo. Study participants were given either creatine or a placebo for at least five years, and there was no evidence to support the use of creatine.2,3,4

Vitamin C and Vitamin E

Vitamin C and vitamin E are both antioxidants. One study that evaluated these vitamins found that they helped delay the need for PD medications. Taking vitamin E alone did not seem to have the same benefit, and vitamin E supplements can increase the risk of bleeding, especially in those who take blood thinners, like Coumadin, Plavix, or aspirin. Vitamin E has also been studied for its potential to reduce the risk of developing PD; however, dietary intake of vitamin E did not show any reduction in the risk of developing PD.3,5


Glutathione is a compound that has several effects on nerve cell metabolism and is a powerful antioxidant. Studies have shown that glutathione is depleted in the substantia nigra (one part of the brain that is damaged by Parkinson’s) in people with PD. A recent placebo controlled study did not show that glutathione improves in motor symptoms compared to the control group. Current research is investigating if glutathione may prevent the progression of the disease.2,6


Curcumin is the spice in turmeric, often used in Indian cuisine and medicine. Curcumin has antioxidant, anti-inflammatory, and anti-cancer properties, and it seems to provide protection against nerve cell injury. In research studies, curcumin has shown that it can prevent the clumping of the protein alpha-synuclein. Clumps of alpha-synuclein, also called Lewy bodies, are one of the hallmarks of PD. Preventing Lewy bodies from forming could potentially reduce symptoms or slow the progression of the disease, although research is still in its early stages.7,8

Herbal remedies

Some people with PD take St. John’s Wort (Hypericum perforatum) to ease depression, which is a common non-motor symptom of PD. Since St. John’s Wort has been shown to have similar properties to antidepressants, it should not be taken along with antidepressants.2

Other people with PD use herbal remedies for insomnia, to calm anxiety, or improve overall well-being. There are no scientific studies that prove the effectiveness of herbal remedies for people with PD, and anyone using them should speak with their doctor to ensure they don’t interfere with other medications.2

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Written by: Emily Downward | Last reviewed: November 2020