The “Brain Nutrients” You’ve Probably Never Heard Of

You may have seen advertisements claiming that after 60, your brain is missing six important nutrients that almost nobody talks about.

It sounds intriguing.

It also raises a very good question:

What does the science actually say?

The advertisement is connected to John E. Lewis, Ph.D., a researcher who has spent years studying nutrition, immune function and cognitive health. Lewis is also the founder of a company that sells a supplement called Daily Brain Care.

That doesn’t automatically make his research wrong.

But it does mean we should look carefully at what has actually been studied—and what hasn’t.

Start with the six “nutrients”

Here’s where the marketing language gets a little slippery.

Daily Brain Care describes itself as combining six functional foods, rather than six nutrients that older people’s brains are known to be deficient in.

Its principal ingredients include acetylated aloe polymannose, stabilized rice bran, golden flaxseed, sunflower lecithin, dioscorea (wild yam) and citric acid.

The company says the formula is intended to provide nutritional support for brain health and is based partly on research conducted by Lewis and his colleagues.

That’s quite different from saying:

“After 60, your brain is missing six nutrients.”

There isn’t good evidence establishing that as a general fact about people over 60.

And that’s an important distinction.

But the aloe research is genuinely interesting

Lewis and colleagues conducted a 12-month study involving 34 adults with Alzheimer’s disease who consumed an aloe-polymannose multinutrient formula.

The researchers reported improvements in average cognitive scores after nine and 12 months, and 46% of participants showed what the researchers considered clinically significant improvement on one cognitive measure.

At first glance, that sounds impressive.

But there’s a major limitation.

There was no placebo control group.

It was an open-label pilot study, meaning both the participants and researchers knew what was being taken.

That makes it impossible to know how much of the observed improvement was actually caused by the supplement.

Participants were also people who already had Alzheimer’s disease.

So we can’t take the results and assume that the same supplement will improve memory in a healthy 65-year-old.

Researchers looked at BDNF, too

A later study involving the same general group looked at brain-derived neurotrophic factor, or BDNF.

BDNF is involved in the growth, maintenance and signaling of neurons, which makes it an interesting molecule when researchers are studying cognition.

But the results were hardly a slam dunk.

After 12 months, BDNF itself did not significantly increase.

The researchers did find changes in relationships between BDNF measurements and cognitive scores, which they considered potentially meaningful.

That’s an interesting research finding.

It’s not the same as demonstrating that the supplement improves memory.

There is more research—but it’s still early

A 2023 paper from Lewis and colleagues examined immune-system changes in people with moderate-to-severe Alzheimer’s disease who consumed the aloe-polymannose formula.

Several measures of immune balance changed over 12 months, and some changes were associated with cognitive measures.

Again, that’s interesting.

But it’s still the same basic problem:

These aren’t large, randomized, placebo-controlled trials demonstrating that the supplement prevents or treats Alzheimer’s disease.

They’re pieces of preliminary evidence that may justify further research.

And that’s a perfectly legitimate place for science to be.

Then there’s rice bran

This is where the story gets even more fascinating.

Rice bran contains a variety of compounds, including fiber, vitamins, minerals and phytochemicals.

Some research has investigated specialized rice-bran preparations for immune function and quality of life.

One small randomized, double-blind trial involving 60 healthy adults over 56 found improvements in several quality-of-life measures after three months of an arabinoxylan rice-bran preparation. But this was a quality-of-life study—not proof that rice bran prevents dementia or improves memory.

Another very small randomized trial involving only 12 older adults found increased activity of certain natural-killer cells after a month of an arabinoxylan rice-bran supplement. The researchers themselves described the work as preliminary and called for additional trials.

And there is some interesting research on brown rice itself.

A 2025 randomized trial involving 44 adults aged 65–85 found some improvements in cognitive and motivational measures among people consuming a specially processed brown rice compared with white rice. But the researchers also said larger, prospectively registered trials are needed.

So there is definitely something worth investigating here.

But rice bran research isn’t the same thing as proving that a particular supplement improves cognition.

What does the bigger picture tell us?

This may actually be the most important part.

The National Institute on Aging says research suggests that healthy eating patterns such as Mediterranean- and MIND-style diets may be associated with better cognitive outcomes.

But it also makes an important point:

No vitamin or dietary supplement has been proven to prevent Alzheimer’s disease or age-related cognitive decline.

That’s a very different message from the typical supplement advertisement.

And the National Institute on Aging specifically cautions people about products claiming to sharpen memory or prevent dementia.

The FDA has issued similar warnings about unproven products marketed as Alzheimer’s treatments or cures.

So is the research worthless?

No.

And this is where I think the story gets more interesting than simply calling the product “good” or “bad.”

Aloe polysaccharides are an intriguing area of research.

Rice-bran compounds are intriguing.

The relationship between nutrition, inflammation, immune function and the brain is intriguing.

And Lewis and his colleagues have published peer-reviewed research investigating these questions.

But interesting isn’t the same as proven.

A small clinical study can be a reason to conduct a larger study.

It isn’t necessarily a reason to buy a supplement.

There’s one more thing worth knowing

Lewis isn’t simply an outside researcher whose work happens to support a product.

He is also the founder and president of the company selling Daily Brain Care, and the company’s website says the formula is based on research he designed and published.

That’s not evidence that his research is invalid.

But it is relevant information for a consumer.

When someone both conducts research and sells a product based on that research, independent replication becomes particularly important.

That’s one of the basic protections science gives us against our own assumptions.

The question worth asking

Instead of asking:

“Do I need these six brain nutrients?”

A better question might be:

“What evidence shows that taking these particular ingredients improves cognitive health in people like me?”

That’s a much harder question to answer.

And right now, the answer appears to be:

We don’t know yet.

There are promising clues.

There are human studies.

There are plausible biological mechanisms.

But there isn’t enough high-quality evidence to conclude that people over 60 are generally deficient in these six substances—or that taking this particular combination will prevent cognitive decline.

The takeaway

The science behind aloe, rice bran and other nutritional compounds is interesting enough to deserve more research.

But you don’t need to turn an interesting scientific question into a purchase decision.

Sometimes the most useful thing you can learn from a health advertisement is not whether the product works.

It’s how much evidence would be needed before you believe the claim.