Green tea antioxidant plus vitamin B3 form boosts nerve cells’ clearance of Alzheimer’s protein in lab study

New laboratory research suggests a compound found in green tea, when paired with a form of vitamin B3, can restore function in aging nerve cells and increase their ability to clear amyloid protein clusters linked to Alzheimer's disease.

The study, published in the journal GeroScience, identified the two compounds as epigallocatechin gallate, an antioxidant abundant in green tea, and nicotinamide, a form of vitamin B3. Researchers reported that treated nerve cells showed reversal of age-related decline and an enhanced capacity to remove the amyloid protein aggregates that are a hallmark of Alzheimer's.

According to the authors, epigallocatechin gallate appeared to help restore a key molecule involved in cellular energy production in brain cells, while nicotinamide supplied a vitamin form linked to metabolic processes. Nicotinamide is produced in the body from niacin-rich foods, including cereals, fish, nuts, legumes and eggs.

Researchers described the combined treatment as promoting cellular processes that clear waste products in neurons. In the cultured cells used in the experiments, those processes were diminished with age; treatment with the two natural compounds not only reversed that decline but also improved the cells' ability to break down and remove amyloid protein clusters.

Alzheimer's disease is the leading cause of dementia worldwide. The condition is characterized by progressive memory loss and cognitive decline and is associated with the accumulation of amyloid plaques and tau tangles in the brain. There is currently no cure; treatments approved so far are aimed at managing symptoms or slowing progression, and experts emphasize the importance of early diagnosis for better outcomes.

The new findings add to a body of laboratory work exploring how naturally occurring compounds may influence cellular mechanisms implicated in neurodegeneration. The authors noted that the results are limited to experiments in cultured nerve cells and do not demonstrate clinical benefit in animals or humans.

Scientists caution that laboratory findings do not directly translate into safe or effective treatments for people. Key questions remain about whether the compounds reach effective concentrations in the human brain, appropriate dosing, long-term safety and whether similar effects would occur in living organisms. The researchers called for further studies in animal models and, if those are successful, carefully designed clinical trials to assess efficacy and safety in people.

The study's publication prompted interest among researchers who study aging and neurodegenerative disease because it identifies a combination of widely available natural compounds that target cellular energy and clearance pathways. Prior research has investigated green tea polyphenols and B vitamins separately for potential brain-health effects; the new study focuses on their combined impact on cellular waste-removal mechanisms.

Until results from animal studies or clinical trials are available, medical professionals advise against interpreting these laboratory results as justification for new treatments. Dietary sources of niacin and commercially available green tea extracts are already part of many people's diets, but clinicians stress that anyone considering supplements should consult a health care provider, particularly because supplements can interact with medications and underlying conditions.

The study adds to ongoing efforts to understand and target the biological processes that contribute to Alzheimer's, and underscores the pathway from laboratory discovery to the more extensive testing required before any new therapy can be recommended for patients.