Neem in the News: Alzheimer’s Disease

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Neem Leaf Extract Investigated for Possible Value in Alzheimer’s Disease

The full article online (linked in the title) was published in the peer-reviewed International Journal of Applied and Basic Medical Research. Comments are welcome, particularly since neem is not known for these properties in the U.S. and most hands-on experience follows the use of neem for other issues.


Alzheimer’s Disease—AD—is a scourge. It’s currently the 6th leading cause of death in the U.S., and the 5th leading cause of death worldwide. As life span has been extended and the size of the elderly population has been increasing, the presence of AD increases along with it. It is a devastating disease for many years before death comes, with progressive loss of memory, of the ability to understand, of the ability to carry out one’s responsibilities—eventually, even the most basic self-care. Behavioral and mood changes occur with a number of people as well. There is no effective treatment.

Some of the many benefits attributed to neem during its long history of traditional use in Ayurvedic medicine have been studied and verified in animals, and this includes benefits with valuable potential for AD patients—and those who care for them. And in fact, neem leaf has been studied in animal models of several other degenerative brain diseases with very encouraging results. (An animal model is a small animal—usually a rat or mouse, sometimes a rabbit—whose functioning has been altered to be as close as possible to humans with that particular disease.) The benefits of neem leaf that the authors of this study thought could be extremely helpful for AD patients are: reducing anxiety, improving memory and understanding. They discovered another benefit as they conducted the study—reducing depression. This had not been documented before.

Because there is disagreement about what is actually causing the brain damage in AD, these researchers created two animal models of AD using lab rats. The altered behavior and emotions of the animals was the same, but the way the brain damage was created that produced these results differed. Before the AD was created, the animals in each future-AD group were divided into those who were given a neem leaf extract for seven days before their AD transformation, and those who were given a placebo—it looked the same, but it was a neutral substance. After the animals had received their seven days of neem or placebo, they were transformed into AD animals and then put through various challenges.

There is lots of data already collected as to how normal healthy rats perform on these standardized tests, so the changes and losses that occurred with these AD animals was clear to see. These tests involved being in an open area, elevated maze, swim test, water maze, shock avoidance. Each had multiple components, and some had several variations as well. Some called on various types of memory. Others required the animals to be calm in order to function well. And one test can actually produce despair.

The AD animals that had consumed neem leaf for seven days did substantially better on all of these tests. They were not nearly as anxious and their memory was significantly better, which duplicated results in previous studies of different brain diseases. And in a first-time observation—these neem-treated AD animals were also less depressed. This was clear from the test that can produce despair.  

The anxiety reduction in the neem-treated animals was comparable to what the results would have been if the animals had been given Valium. And the better learning was comparable to improvements seen with Aricept, the most common prescription treatment for AD.

Studying the animals’ brains afterward provided strong evidence that neem leaf has “important antioxidant activity.”

As a side note, the researchers made their neem leaf preparation themselves, starting with their own plants. “Fresh green leaves of A. indica were collected from the Ayurvedic garden of our institute in the month of April.” They also analyzed their final product to identify all of the bioflavonoids and phytosterols it contained, and their exact percentages, in part to make sure that all of their neem-treated animals would be given the identical product.

The key in reversing AD in these experimental studies seems to be neem’s antioxidant activity, but the study is a preliminary report and does not explain the full mechanism of activity.

Personally, I take care of an ex-employee whose family has deserted her – she’s on neem now. And as a 62-year-old woman with a family history of early-onset dementia, I’m taking it daily rather than after exposure to someone with a bug the way I had been.

Over the years, we’ve heard comments about neem helping AD but didn’t document them because we hadn’t seen this study and assumed they were more wishful thinking than actual results. We welcome comments on this article, particularly from people who are caring for people who take neem for issues like arthritis.

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  • ellen frogner

    Many years ago, my father-in-law started taking neem for diabetes. Although he had not been diagnosed with ALZ at the time, we knew he was getting there – lots of short term memory loss. After taking neem for a while, we noticed a significant return in his memory (as long as he “remembered” to take the neem! Not clinical results, but it happened.

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