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Home Science & Environment

Parkinson’s Link to Gut Bacteria Hints at an Unexpected, Simple Treatment : ScienceAlert todayheadline

August 8, 2025
in Science & Environment
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Researchers have suspected for some time that the link between our gut and brain plays a role in the onset of Parkinson’s disease.

A recent study identified gut microbes likely to be involved and linked them with decreased riboflavin ( vitamin B2) and biotin (vitamin B7), suggesting an unexpectedly simple treatment that may help: B vitamins.

“Supplementation therapy targeting riboflavin and biotin holds promise as a potential therapeutic avenue for alleviating PD symptoms and slowing disease progression,” Nagoya University medical researcher Hiroshi Nishiwaki said when the study was published in May 2024.

Related: Parkinson’s Disease Might Not Start in The Brain, Study Finds

The neurodegenerative disease impacts almost 10 million people globally, who at best can hope for therapies that slow and alleviate symptoms.

Symptoms typically begin with constipation and sleep problems, up to 20 years before progressing into dementia and the debilitating loss of muscle control.

Previous research found people with Parkinson’s disease also experience changes in their microbiome long before other signs appear.

Parkinson’s disease impacts almost 10 million people globally. (pixelshot/Canva Pro)

Analyzing fecal samples from 94 patients with Parkinson’s disease and 73 relatively healthy controls in Japan, Nishiwaki and team compared their results with data from China, Taiwan, Germany, and the US.

While different groups of bacteria were involved in the different countries examined, they all influenced pathways that synthesize B vitamins in the body.

The researchers found the changes in gut bacteria communities were associated with a decrease in riboflavin and biotin in people with Parkinson’s disease.

Graphic of human gut-brain connection and B vitamins
In Parkinson’s disease, a reduction in the gut bacteria of genes responsible for synthesizing the essential B vitamins B2 and B7 was found. (Reiko Matsushita)

Nishiwaki and colleagues then showed the lack of B vitamins was linked to a decrease in short-chain fatty acids (SCFAs) and polyamines: molecules that help create a healthy mucus layer in the intestines.

“Deficiencies in polyamines and SCFAs could lead to thinning of the intestinal mucus layer, increasing intestinal permeability, both of which have been observed in Parkinson’s disease,” Nishiwaki explained.

A graphic depicting the process of gut bacteria depleting B vitamins and leading to symptoms of Parkinson's disease
Summary of findings from the study and speculations from previous research. (Nishiwaki et al., npj Parkinson’s Dis., 2024)

They suspect the weakened protective layer exposes the intestinal nervous system to more of the toxins we now encounter more regularly. These include cleaning chemicals, pesticides, and herbicides.

Such toxins lead to the overproduction of α-synuclein fibrils – molecules known to amass in dopamine-producing cells in the substantia nigra part of our brains, and increased nervous system inflammation, eventually leading to the more debilitating motor and dementia symptoms of Parkinson’s.

A 2003 study found high doses of riboflavin can assist in recovering some motor functions in patients who also eliminated red meat from their diets.

So it’s possible that high doses of vitamin B may prevent some of the damage, Nishiwaki and team propose.

Illustration of a vitamin B2 molecule in the blood.
Illustration of a riboflavin (B2) molecule in the blood. (Nemes Laszlo/Science Photo Library/Getty Images)

This all suggests healthy gut microbiomes may also prove protective, and reducing the toxic pollutants in our environment may help too.

Of course, with such a complicated chain of events involved in Parkinson’s disease, it’s likely that not all patients experience the same causes, so each individual would need to be assessed.

“We could perform gut microbiota analysis on patients or conduct fecal metabolite analysis,” explained Nishiwak.

“Using these findings, we could identify individuals with specific deficiencies and administer oral riboflavin and biotin supplements to those with decreased levels, potentially creating an effective treatment.”

This research was published in npj Parkinson’s Disease.

An earlier version of this article was published in June 2024.

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