{"id":446190,"date":"2026-05-13T05:35:09","date_gmt":"2026-05-13T05:35:09","guid":{"rendered":"https:\/\/www.newsbeep.com\/ie\/446190\/"},"modified":"2026-05-13T05:35:09","modified_gmt":"2026-05-13T05:35:09","slug":"scientists-identify-simple-supplement-that-greatly-reduces-alzheimers-damage","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ie\/446190\/","title":{"rendered":"Scientists Identify Simple Supplement That Greatly Reduces Alzheimer\u2019s Damage"},"content":{"rendered":"

\"Alzheimers<\/a>Scientists in Japan found that arginine, a common amino acid already used in supplements and medicine, reduced harmful amyloid buildup in Alzheimer\u2019s animal models. Credit: Stock<\/p>\n

A widely available amino acid may offer a new way to target Alzheimer\u2019s disease before major damage occurs.<\/p>\n

Scientists in Japan say a common amino acid already sold as a dietary supplement may help slow key processes linked to Alzheimer\u2019s disease.<\/p>\n

In a study published in Neurochemistry International, researchers found that arginine reduced the buildup of toxic amyloid \u03b2 (A\u03b2) proteins in both fruit fly and mouse models of Alzheimer\u2019s disease (AD). The compound also appeared to ease brain inflammation and improve behavioral performance in mice.<\/p>\n

Arginine is not a new experimental drug. It is a naturally occurring amino acid involved in functions such as blood flow, immune signaling, and wound healing, and it already has an established medical safety record in several conditions.<\/p>\n

Alzheimer\u2019s Disease and the Search for Safer Treatments<\/p>\n

Alzheimer\u2019s disease affects more than 50 million people worldwide, and that number is expected to rise sharply as populations age. One of the disease\u2019s defining features is the accumulation of amyloid \u03b2 proteins in the brain. Over time, these proteins misfold and clump together into sticky plaques that are believed to damage neurons and trigger inflammation.<\/p>\n

\"Alzheimer<\/a>Laboratory experiments revealed that arginine reduced the formation and growth of toxic amyloid fibrils. Credit: Stock<\/p>\n

Although newer antibody drugs such as lecanemab and donanemab were designed to remove amyloid from the brain, their benefits have been modest for many patients. The treatments can also cost tens of thousands of dollars per year and may cause potentially serious side effects, including brain swelling and bleeding known as amyloid-related imaging abnormalities (ARIA).<\/p>\n

The Japanese research team took a very different approach. Instead of trying to clear plaques after they form, they investigated whether arginine could stop amyloid proteins from clumping together in the first place.<\/p>\n

How Arginine May Protect the Brain<\/p>\n

Arginine belongs to a class of molecules known as chemical chaperones. These compounds help proteins maintain their proper shape and may prevent the kind of misfolding seen in neurodegenerative diseases. Previous research<\/a> from the same group suggested arginine could reduce harmful protein aggregation in disorders such as spinocerebellar ataxia type 6 (SCA6), prompting researchers to test whether the same effect might apply to Alzheimer\u2019s disease.<\/p>\n

The study was led by graduate student Kanako Fujii and Professor Yoshitaka Nagai of Kindai University\u2019s Faculty of Medicine in Osaka, together with Associate Professor Toshihide Takeuchi from the university\u2019s Life Science Research Institute.<\/p>\n

In laboratory experiments, the researchers found that arginine directly reduced the formation of A\u03b242 fibrils, one of the most aggregation-prone forms of amyloid \u03b2. Higher arginine concentrations produced stronger anti-aggregation effects. Electron microscope images also showed that amyloid fibers exposed to arginine were shorter and less developed.<\/p>\n

\"Holding<\/a>Arginine is found naturally in protein-rich foods such as meat, fish, eggs, dairy products, nuts, seeds, and legumes. It is also widely available as a dietary supplement. Credit: StockResults in Fruit Flies and Mice<\/p>\n

The team then moved to animal models.<\/p>\n

In genetically engineered fruit flies carrying the aggressive Arctic mutation linked to inherited Alzheimer\u2019s disease, arginine reduced amyloid buildup and lessened damage in the flies\u2019 eyes, a commonly used indicator of neurotoxicity in Drosophila studies. The protective effects increased with higher doses.<\/p>\n

The researchers next tested arginine in AppNL-G-F knock-in mice, which carry three human familial Alzheimer\u2019s mutations and gradually develop amyloid plaques in the brain. Mice that received arginine in their drinking water from an early age developed fewer plaques in regions critical for memory, including the hippocampus and cortex.<\/p>\n

Importantly, the treatment did not simply lower amyloid production. Instead, evidence suggested arginine interfered with the aggregation process itself. Levels of insoluble A\u03b242, the form associated with plaque formation, dropped significantly, while soluble amyloid levels remained largely unchanged.<\/p>\n

Reduced Inflammation and Improved Behavior<\/p>\n

The mice also showed signs of neurological improvement. In maze-based behavioral tests, arginine-treated animals displayed greater movement and exploratory activity compared with untreated Alzheimer\u2019s model mice. Researchers additionally found reduced activity of inflammatory genes linked to cytokines such as IL-1\u03b2, IL-6, and TNF, molecules heavily associated with chronic brain inflammation in Alzheimer\u2019s disease.<\/p>\n

\u201cOur study demonstrates that arginine can suppress A\u03b2 aggregation both in vitro and in vivo,\u201d said Professor Nagai. \u201cWhat makes this finding exciting is that arginine is already known to be clinically safe and inexpensive, making it a highly promising candidate for repositioning as a therapeutic option for AD.\u201d<\/p>\n

\"Anti<\/a>Researchers at Kindai University have discovered that oral administration of arginine, a naturally occurring amino acid, can suppress amyloid \u03b2 (A\u03b2) aggregation and alleviate neurological symptoms in animal models of Alzheimer\u2019s disease. Their findings highlight arginine\u2019s potential as a safe and affordable therapeutic candidate for Alzheimer\u2019s and other protein misfolding-related neurodegenerative disorders. Credit: Tetiana Korzun<\/p>\n

The idea of \u201cdrug repositioning\u201d has become increasingly attractive in neuroscience because developing brand-new Alzheimer\u2019s drugs often takes more than a decade and costs billions of dollars. Repurposed compounds with known safety profiles can potentially move into clinical testing much faster.<\/p>\n

Potential Beyond Alzheimer\u2019s Disease<\/p>\n

Researchers also note that amyloid buildup may begin 15 to 20 years before memory symptoms appear. Because arginine can be taken orally and has already been used clinically for other disorders, scientists believe it could eventually be explored as a long-term preventive strategy, particularly for people at elevated genetic risk.<\/p>\n

Still, the authors caution that the work remains at the preclinical stage. Animal models cannot fully reproduce human Alzheimer\u2019s disease, and the mice used in the study do not develop every hallmark of the condition, such as extensive neuron loss or tau tangles. The researchers also emphasized that the experimental dosing used in the study does not match commercially available supplements.<\/p>\n

\u201cOur findings open up new possibilities for developing arginine-based strategies for neurodegenerative diseases caused by protein misfolding and aggregation,\u201d Nagai said. \u201cGiven its excellent safety profile and low cost, arginine could be rapidly translated to clinical trials for Alzheimer\u2019s and potentially other related disorders.\u201d<\/p>\n

For now, scientists say larger preclinical and human studies will be needed to determine whether arginine can meaningfully slow Alzheimer\u2019s progression in patients.<\/p>\n

Reference: \u201cOral administration of arginine suppresses A\u03b2 pathology in animal models of Alzheimer\u2019s disease\u201d by Kanako Fujii, Toshihide Takeuchi, Yuzo Fujino, Noriko Tanaka, Nao Fujino, Akiko Takeda, Eiko N. Minakawa and Yoshitaka Nagai, 30 October 2025, Neurochemistry International.
DOI: 10.1016\/j.neuint.2025.106082<\/a><\/p>\n

Funding: Ministry of Education, Culture, Sports, Science, and Technology, Japan Society for the Promotion of Science, Japan Science and Technology Agency, National Center of Neurology and Psychiatry<\/p>\n

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