What a new 90-day clinical trial of Himalayan Tartary Buckwheat Sprout Powder (HTB Activ™) means for healthy aging
Most of us think of aging as the number of birthdays we've had. Over the past two years, some of the largest studies ever done on human aging have shown that this is only part of the picture. Your organs don't all age at the same speed. Two of them, the brain and the immune system, seem to affect how long and how well you live more than any of the others.
That is why the results of a new study from Big Bold Health matter. It was a 90-day, 662-person, double-blind, placebo-controlled clinical trial of a food ingredient called Himalayan Tartary Buckwheat Sprout Powder (HTB Activ™). The researchers measured changes in both of those systems at once: how well people's brains worked, and how old their immune cells looked at the epigenetic level.
First, the big picture: two organs that seem to set the pace of aging
In 2025, researchers at Stanford published a study in Nature Medicine that looked at blood samples from more than 44,000 people in the UK Biobank. They used thousands of blood proteins to estimate the "biological age" of 11 different organs, then followed people for up to 17 years.
Organs that looked older than a person's actual age predicted diseases such as heart failure, type 2 diabetes and Alzheimer's disease. People with several "old" organs had a much higher risk of dying. But two organs stood out for the opposite reason. People with a youthful brain had about a 40% lower risk of death during the study, and people with a youthful immune system had about a 42% lower risk. People who had both had a 56% lower risk. Over 17 years, about 8% of typical agers died, compared with fewer than 4% of people whose brain and immune system both looked young. The brain finding was especially striking for Alzheimer's disease. An older-looking brain raised Alzheimer's risk about as much as carrying one copy of APOE4, the best-known genetic risk gene. A younger-looking brain was about as protective as carrying the most protective version of that gene. The researchers also found that these organ ages moved with lifestyle: exercise, eating oily fish, smoking, and certain supplements were all linked to them. In other words, this isn't fixed at birth.
A second study, from University College London and published in The Lancet Digital Health, followed more than 6,000 middle-aged adults for 20 years. It found that when one organ ages faster than it should, the risk of disease goes up across the whole body. One result was surprising: an older immune system was the strongest long-term predictor of developing dementia, stronger than an older brain.
The message from both studies is that the brain and the immune system are closely connected, and they age together. Given these facts, what value would a nutritional product that reduced immune aging and improved brain function?
Immune resilience: the 15-year difference
A third study, led by Dr. Sunil Ahuja and published in Aging Cell in 2025, looked at more than 17,000 people, from infants to the very old. It focused on what the researchers call immune resilience: the ability to fight off an infection strongly and then turn the inflammation off once the threat has passed.
People with poor immune resilience at age 40 had the same risk of dying as people 15 years older whose immune systems were resilient. During midlife (ages 40 to 70), people with the best immune resilience had 69% lower mortality.
The researchers named three processes that work together to speed up aging:
- Inflammaging: low-grade inflammation that never fully switches off.
- Immune senescence: immune cells slowly losing their ability to respond.
- Cellular senescence: worn-out cells that stay in the body and send out harmful signals.
They also found that inflammation, more than age itself, was the main force wearing down the immune system. When inflammation came down, immune cells could regain more youthful patterns of gene activity. The researchers called the years before about age 70 a "biological warranty period," when efforts to improve immune resilience seem to have the most effect.
Given these facts, what value would a nutritional product that was clinically proven to reduce immune aging and improve brain function?
Where epigenetics comes in
Your genes are the instruction manual. Epigenetics decides which pages get read. One of the main ways cells mark those pages is DNA methylation, which works like chemical bookmarks that switch genes up or down. As we age, and especially under chronic inflammation, the bookmarks in immune cells shift toward patterns linked to inflammation and worn-out immune function. Scientists can read these patterns to estimate how "old" immune cells are.
The key point is that these bookmarks can be moved. Diet, exercise, sleep, stress and toxins all affect them. That is the central idea of Dr. Jeffrey Bland's new book, The Nourished Gene: food is information that tells our genes how to behave, not just calories. The immune system responds especially strongly to that information.
What the Himalayan Tartary Buckwheat Sprout Powder (HTB Activ™) trial found
Tartary buckwheat is a seed rather than a grain, so it is naturally gluten-free. It is unusually rich in plant compounds called polyphenols, including rutin, quercetin and related flavonoids. These compounds are known to calm inflammatory signaling and to affect how immune genes are expressed. Sprouting the seed and growing it in the harsh conditions of the Himalayas increases these compounds even further.
In the new trial, participants took HTB Activ or a look-alike placebo every day for 90 days. Neither the participants nor the researchers knew who was getting which. The study found three things:
1. People felt their thinking had improved. Participants taking the buckwheat powder reported a statistically significant improvement in cognitive abilities compared with placebo. This was measured with the NIH PROMIS questionnaire, a standardized tool developed by the U.S. National Institutes of Health and widely used in medical research to measure everyday mental sharpness, memory and focus.
2. Their brains worked faster without making more mistakes. On validated cognitive performance tests, participants processed information faster and stayed just as accurate. That combination matters. Speed and accuracy usually trade off against each other, and slower processing is one of the earliest measurable signs of brain aging. Getting faster while staying accurate is what a younger brain does.
3. Their immune cells looked younger at the genetic level. When the researchers compared DNA methylation patterns in immune cells before and after the 90 days, they found fewer of the epigenetic marks linked to immune cell aging and inflammation.
The study was large for a nutrition trial. According to The Nourished Gene, it included about 660 participants. It also builds on an earlier 50-person pilot study, published in Frontiers in Nutrition in 2024, which found that Tartary buckwheat polyphenols changed epigenetic markers of immune age.
Why seeing both results together matters
Each of these results would be interesting on its own. What makes this trial notable is that the brain and the immune system improved in the same people over the same 90 days.
That is exactly the pattern the large aging studies point to. The Stanford team found that a youthful brain and a youthful immune system together were the strongest predictor of a long life. They suggested this is because the two systems constantly talk to each other: chronic inflammation in the body affects the brain, and the brain in turn helps regulate inflammation. The UCL study found that immune aging was the strongest long-term warning sign for dementia. And the immune resilience research showed that lowering the inflammatory load lets immune cells regain more youthful behavior.
The HTB Activ Study fits that picture. A food rich in polyphenols appears to have shifted immune cells away from an inflamed, aged epigenetic pattern, and in the same period people's thinking became faster and sharper. This does not prove that one caused the other. But it is what you would expect to see if calming immune aging also benefits the brain.
What this does and doesn't mean
It's worth being clear about the limits of this evidence.
- This is a 90-day study. It shows changes in thinking and in immune markers, not that people will live longer or avoid dementia. Those outcomes take years or decades to measure.
- The large aging studies are observational. They show that younger-looking brains and immune systems go along with longer lives. They don't prove that changing those markers adds years. That still has to be tested directly.
- One trial is a beginning. The most convincing science is replicated by independent groups, and the next steps should include longer follow-up and a wider range of participants.
- It isn't a replacement for the basics. The same research that points to the brain and immune system also points to exercise, sleep, stress management, not smoking, and a diet rich in plants and omega-3s. A polyphenol-rich food works best as part of that foundation, not as a substitute for it.
With those caveats, the result is encouraging. For decades, supplement studies relied on vague, self-reported benefits. This trial used an NIH-validated questionnaire, objective performance testing, a placebo control, and a molecular measure of immune aging, all in the same study. It suggests that something as ordinary as a daily scoop of a sprouted seed powder might help move two of the body's most important aging systems in a younger direction.
The takeaway
Aging is not just time passing. It is a process driven partly by immune activation inflammation by how our genes are being instructed. The immune system and the brain sit at the center of it. This newest research suggests that keeping the immune system youthful may be one of the most effective things we can do for a long and healthy life.
SOURCES:
- Oh HS-H et al. "Plasma proteomics links brain and immune system aging with healthspan and longevity." Nature Medicine 31:2703–2711 (2025).
- Kivimäki M et al. "Proteomic organ-specific ageing signatures and 20-year risk of age-related diseases: the Whitehall II observational cohort study." Lancet Digital Health 7:e195–204 (2025).
- Manoharan MS, Ahuja SK et al. "The 15-Year Survival Advantage: Immune Resilience as a Salutogenic Force in Healthy Aging." Aging Cell (2025), from your BBH summary document.
- Bland JS. The Nourished Gene (review draft, September 2026).
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Perlmutter A, Bland JS et al. "The impact of a polyphenol-rich supplement on epigenetic and cellular markers of immune age: a pilot clinical study." Front Nutr 11:1474597 (2024)
