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Parkinson’s Disease

Parkinson’s disease results from progressive damage to the nerves in the area of the brain responsible for controlling muscle tone and movement. The damaged cells are those needed to produce a neurotransmitter (chemical messenger in the brain) called dopamine, so people with Parkinson’s disease manufacture inadequate amounts of dopamine.

Parkinson’s disease occurs primarily, but not exclusively, in the elderly. Parkinson-like symptoms can also be caused by prescription and illicit drugs.


Rating Nutritional Supplements Herbs
Coenzyme Q10
Vitamin B2
Vitamin C and vitamin E (in combination)
5-HTP (with Sinemet®)
Vitamin B6 (with Sinemet® or selegiline)
Vitamin D
Mucuna prurient
Psyllium husks (for constipation)
Reliable and relatively consistent scientific data showing a substantial health benefit.
Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support and/or minimal health benefit.


What are the symptoms of Parkinson’s disease?

Symptoms include a fixed facial expression, wide-eyed stare with infrequent blinking, fluttering of the eyelids, drooling, illegible handwriting, monotone voice, and rhythmic movement of the fingers, hand, foot, or arm when at rest. People with Parkinson’s disease often have difficulty getting out of bed or a soft chair, and may tend to stand stooped over and walk leaning forward with limited arm-swing and small, shuffling steps. Depression and decreased mental functioning are also common symptoms in advanced stages.

Dietary changes that may be helpful for parkinson’s disease

Clinical studies have shown that one can enhance the action of L-dopa and improve the symptoms of Parkinson’s disease by consuming nearly all of the day’s protein intake at dinner, while keeping the protein content of breakfast and lunch extremely low.1 2 3 This dietary approach is now well-accepted, but must be carefully monitored by a qualified healthcare professional in order to avoid deficiencies of protein and certain vitamins and minerals.

Consumption of large amounts of fava beans (Vicia faba), also known as broad beans, might increase the action of L-dopa and possibly lead to L-dopa overdose. Parkinson’s disease patients should, therefore, talk with a doctor before adding broad beans to their diet.

A preliminary study found that higher coffee and caffeine intake is associated with a significantly lower incidence of Parkinson’s disease in older persons.4 These findings do not mean that coffee or caffeineated beverages can be used as a treatment for Parkinson’s disease, but simply that caffeine may in some way help to prevent the development of the disease in its early stages. Until more is known, increasing caffeine consumption is not recommended, even in people with a family history of Parkinson’s disease.

Doctors recommend that people with Parkinson’s disease supplement with fiber and maintain adequate fluid intake to reduce constipation associated with this disease.5 See the discussion about psyllium seed below in “Herbs that may be helpful.”

Lifestyle changes that may be helpful for parkinson’s disease

People with Parkinson’s disease are at higher than normal risk for osteoporosis and vitamin D deficiency. Regular weight-bearing exercise, exposure to sunlight, and a variety of supplements and dietary changes may be helpful in preventing osteoporosis.

A twice-weekly, 14-week program of intensive exercise has been shown to significantly improve the signs and symptoms of Parkinson’s Disease.6 Athletic training included resistance exercises in water to increase strength, as well as exercises increasing flexibility and balance.

There is substantial preliminary evidence that exposure to certain organochlorine insecticides (e.g., lindane [Kwell®, Kildane®, Scabene®] and dieldrin [Dieldrite]) may contribute to the development of Parkinson’s disease.7 8 9 In California, death from Parkinson’s disease increased by about 40% in all Californian counties reporting use of restricted agricultural pesticides since the 1970s compared with those reporting none.10 Avoiding contact with pesticides and pesticide residues may be an important preventive measure for Parkinson’s and other diseases. Interestingly, consumption of the fat substitute olestra appears to increase elimination of certain organochlorine pesticides in the feces.11 12 However, no scientific studies have tested olestra as a possible treatment or preventive measure against Parkinson’s disease. Moreover, since olestra consumption may be associated with other health risks, such as depletion of beta-carotene, people with Parkinson’s should consult with their doctor before consuming products containing olestra.

Nutritional supplements that may be helpful for parkinson’s disease

In a double-blind trial, administration of 1,200 mg of coenzyme Q10 per day for 16 months to people with early Parkinson's disease significantly slowed the progression of the disease, compared with a placebo.13 Smaller amounts of CoQ10 were slightly more effective than placebo, but the difference was not statistically significant.

Some preliminary studies have indicated that high dietary intakes of antioxidant nutrients, especially vitamin E, are associated with a low risk of Parkinson’s disease,14 15 even though Parkinson’s patients are not deficient in vitamin E.16 17 The correlation between protection from Parkinson’s and dietary vitamin E may be not be due to the vitamin E itself, however. Legumes (beans and peas) contain relatively high amounts of vitamin E. Independent of their vitamin E content, consumption of legumes has been associated with low risk of Parkinson’s disease.18 In other words, high vitamin E intake may be a marker for diets high in legumes, and legumes may protect against Parkinson’s disease for reasons unrelated to their vitamin E content.

Interest in the relationship between antioxidants and Parkinson’s disease led to a preliminary trial using high amounts of vitamin C and vitamin E in early Parkinson’s disease19 and to a large ten-year controlled trial of high amounts of vitamin E combined with the drug deprenyl.20 In the trial combining vitamins C and E, people with early Parkinson’s disease given 750 mg of vitamin C and 800 IU of vitamin E four times each day (totaling 3,000 mg of vitamin C and 3,200 IU of vitamin E per day) were able to delay the need for drug therapy (i.e., L-dopa or selegiline) by an average of about two and a half years, compared with those not taking the vitamins.21 The ten-year controlled trial used 2,000 IU of vitamin E per day found no benefit in slowing or improving the disease.22 The difference in the outcomes between these two trials might be due to the inclusion of vitamin C and/or the higher amount of vitamin E used in the successful trial. However, the difference might also be due to a better study design in the trial that found vitamin E to be ineffective.

The amounts of vitamin E used in the above trials were very high, because raising antioxidant levels in brain tissue is quite difficult to achieve.23 In fact, some researchers have found that even extremely high intakes of vitamin E (4,000 IU per day) failed to increase brain vitamin E levels.24 The difficulty in increasing brain vitamin E levels may explain the poor results of the large, controlled trial.

Although vitamin B6 was reported many years ago in preliminary research to improve symptoms of Parkinson’s disease,25 it must not be used by people taking L-dopa alone. Taking vitamin B6 with L-dopa increases the conversion of L-dopa to dopamine outside the brain, thereby reducing delivery of dopamine to the brain.26 27 However, vitamin B6 can be used in conjunction with L-dopa plus carbidopa (Sinemet®) or selegiline (Eldepryl, Atapryl).28

Preliminary trials have suggested that the amino acid, methionine (5 grams per day), may effectively treat some symptoms of Parkinson’s disease.29

Drug therapy for Parkinson’s disease has been reported to deplete vitamin B3 in humans.30 Vitamin B3 may be needed to decrease SAMe levels, and in so doing, may possibly help people with Parkinson’s disease. However, the two main forms of vitamin B3, niacin and niacinamide, when taken in combination with L-dopa, have demonstrated no benefit for people with Parkinson’s disease.31 Nicotinamide adenine dinucleotide (NADH)—the active form of vitamin B3 in the body—effectively raises the level of dopamine in the brain, making it potentially useful in the treatment of people with Parkinson’s disease. In preliminary research, NADH supplementation reduced symptoms and improved brain function in people with Parkinson’s disease.32 33 One researcher has recommended 5 mg taken twice per day for people with Parkinson’s disease.34 However, one small, double-blind, short-term trial using injections of NADH found no significant effects.35

In a preliminary study of 31 Brazilian individuals with Parkinson’s disease, all had laboratory evidence of vitamin B2 (riboflavin) deficiency. Nineteen of these individuals received 30 mg of supplemental riboflavin three times a day for six months. After three months, all participants treated with riboflavin demonstrated an improvement in motor capacity, and this improvement was either maintained or greater at six months.36 The participants in this study also eliminated red meat from their diet, but it is not clear whether that dietary change played any role in the observed improvement.

In a preliminary report, 5-hydroxytryptophan (5-HTP) used in combination with Sinemet® improved the emotional depression that is often associated with Parkinson’s disease.37 While 5-HTP may be helpful as a supplement to Sinemet® treatment for Parkinson’s, 5-HTP should never be used alone in Parkinson’s disease.38 39 40 5-HTP is converted to serotonin in the brain, and increasing serotonin without increasing dopamine can cause Parkinson’s symptoms, especially rigidity, to get worse.41 People taking selegiline should not take 5-HTP without a physician’s supervision, as this combination might raise serotonin to excessively high levels.42

L-tyrosine is the direct precursor to L-dopa. Theoretically, supplementing L-tyrosine could be an alternative to L-dopa therapy; however, L-tyrosine should not be taken with L-dopa as it may interfere with the transport of L-dopa to the brain.43 One small preliminary trial demonstrated that some people with Parkinson’s disease who supplemented with L-tyrosine (45 mg per pound of body weight) for three years had better clinical results and fewer side effects than did patients using L-dopa.44 Until these findings are confirmed, L-tyrosine should not be used as a replacement for, or in addition to, L-dopa.

In a small, four-week trial, D-phenylalanine (DPA) supplementation improved motor control and tremors in people with Parkinson’s disease.45 Additional research is needed before the benefits of this treatment can be considered proven. DPA should not be taken with L-dopa as it may interfere with the transport of L-dopa to the brain.46 People with Parkinson’s disease should consult with a physician before using DPA. Some commercially available phenylalanine products contain a 50:50 mixture of DPA and LPA, the form of phenylalanine that occurs naturally in food (these products are known as DLPA). People with Parkinson’s disease should consult a physician before using DPA or DLPA.

People with Parkinson’s disease treated with L-dopa have been reported to have reduced levels of the neurotransmitter phosphatidylserine.47 In one trial, supplementing with phosphatidylserine (100 mg three times daily) improved the mood and mental function in patients with Parkinson’s disease, but exerted no beneficial effects on muscle control.48 The phosphatidylserine used in this trial was obtained from cow brain. That product is not available in the United States, because of concern that an extract of cow brain could cause Creutzfeld-Jakob disease, the human variant of “mad cow” disease. The phosphatidylserine sold in the United States is manufactured from plant sources and cow-brain phosphatidylserine.49

Vitamin D deficiency is common in Parkinson’s disease. People with Parkinson’s often get insufficient sun exposure and have reduced levels of activity that adversely affect calcium metabolism.50 Low vitamin D levels in Parkinson’s disease have been reported to increase the risk of hip fracture due to osteoporosis.51 This risk has been significantly reduced with the use of synthetic, activated vitamin D—a prescription drug.52 Whether the same effect could be achieved with supplemental vitamin D remains unknown, though some doctors recommend 400–1,000 IU vitamin D per day. People with Parkinson’s disease may wish to discuss the use of synthetic activated vitamin D with a healthcare professional.

People with Parkinson’s disease have shown both decreased and increased levels of zinc and copper.53 54 55 56 Both nutrients function in the antioxidant enzyme superoxide dismutase (SOD). SOD tends to be low in the area of the brain involved in Parkinson’s disease. In theory, therefore, low levels of zinc and copper could leave the brain susceptible to free radical damage. However, copper and zinc (as well as iron) taken in excess can also act as pro-oxidants, and all have been associated with an increased risk of developing Parkinson’s disease in preliminary research.57 58 Insufficient evidence currently exists for either recommending or avoiding supplementation with zinc and copper.

Are there any side effects or interactions with parkinson’s disease?

Refer to the individual supplement for information about any side effects or interactions.

Herbs that may be helpful for parkinson’s disease

In preliminary research, an extract of Mucuna prurient (HP-200) was studied in people with Parkinson’s disease, 43% of whom were taking Sinemet® before HP-200 treatment; the remaining 57% were not medicated.59 Statistically significant reductions in symptom scores were seen from the beginning to the end of the 12-week trial. The amount used in the trial was 7.5 grams of the extract (dissolved in water) three to six times daily.

Other preliminary research has shown that psyllium seed husks improve constipation and bowel function in people with Parkinson’s disease and constipation.60 A typical recommendation for psyllium seed husks is 3 to 5 grams taken at night with a one to two glasses of fluid.

Are there any side effects or interactions with parkinson’s disease?

Refer to the individual herb for information about any side effects or interactions.