Yeast Beta‑Glucan – Protecting Your Core Immune Defense

The COVID-19 pandemic has had a profound impact on all of us. But it has also helped more people recognize the importance of their own health and immunity – and that's a silver lining worth noting.

Yeast beta-glucan has become an increasingly popular supplement in recent years and has been studied extensively in both animals and humans.

So today, we're going to take a closer look at what it can do.

Yeast β‑Glucan

In 2021, β‑glucan saw a significant surge in popularity across European and American markets, becoming one of the fastest‑growing supplement categories in the United States.

Yeast β-glucan is a polysaccharide derived from yeast cell walls, primarily consisting of β-1,3-linked glucose units with β-1,6 branches. In simple terms, it is a high-molecular-weight carbohydrate composed of glucose units, with a molecular weight of approximately 800-1,000 kDa.

Yeast glucan is a favorite prebiotic among scientists, but unfortunately, not all glucans are equally effective.

Yeast beta-glucan has been studied for a broad range of potential benefits, particularly its effects on immune function, infection response, and metabolic health.

1. Immune Modulation

Immune modulators are compounds that interact with the immune system to either enhance or suppress immune responses.

There are many types of immune cells in the body – including macrophages, neutrophils, and natural killer (NK) cells. Most immunomodulators work indirectly, but yeast beta‑glucan takes a more direct route: it binds to specific receptors on immune cells, activating them and triggering the release of cytokines that stimulate T cells. Activated lymphocytes also produce antibodies to fight off viral and bacterial threats.

It's worth noting that while many natural ingredients on the market claim to modulate immunity – such as spirulina, resveratrol, curcumin, and aloe polysaccharides – the research on these over the past two decades has been either limited or controversial.

Beta‑glucan, however, stands out. It consistently demonstrates the strongest biological effects and offers the most comprehensive support for immune function. Here are some examples of its protective effects across different populations.

For children: In one study of children with respiratory issues, just 30 days of oral beta‑glucan supplementation (100 mg/day) significantly increased salivary immunoglobulin levels (sIgM, sIgG, and sIgA).

Another study reported changes in C-reactive protein (CRP) levels in children exposed to secondhand smoke.

These findings suggest that oral beta-glucan supplementation may offer additional immune support for children with respiratory conditions, although further research is needed to understand its clinical benefits.

2. Anti‑Cancer and Antitumor Activity

Research into beta-glucan's potential antitumor effects dates back to the 1960s. Since then, its possible role in cancer-related immune responses has attracted considerable scientific interest.

In recent decades, research into beta-glucan's potential role in cancer therapy has expanded considerably, including studies investigating its use alongside other therapeutic approaches. A quick look at recent review titles shows this shift, a level of interest rarely seen with other supplement ingredients.

By 2019, its biological effects had been evaluated in over 80 cancer‑related studies and clinical trials. Together, these studies highlight growing interest in beta-glucan's potential therapeutic applications.

The diagram above illustrates one proposed mechanism in the tumor microenvironment: beta-glucan binds to Dectin-1 on myeloid cells, triggering immune signaling that may contribute to antitumor immune responses.

In 2020, researchers at the Chinese Academy of Sciences reported that yeast beta-glucan acted as an autophagy inhibitor in experimental models, suppressing liver cancer cell proliferation and tumor growth.

Below is a selection of clinical trials investigating yeast beta-glucan in the context of cancer therapy, illustrating the growing research interest in this area.

3. Powerful Antioxidant and Cholesterol‑Lowering Effects

Studies show that yeast beta‑glucan protects platelet proteins and lipids from oxidative damage, reduces oxidative stress markers, and increases serum SOD (superoxide dismutase) activity.

It also reduces malondialdehyde levels in the liver (a toxic byproduct) and boosts glutathione peroxidase activity – highlighting its protective benefits for liver health.

In addition, beta-glucan may influence lipid absorption and metabolism, with studies reporting reductions in total and LDL cholesterol.

4. Immune Support for Older Adults

As we age, immune function naturally declines, leaving older adults more vulnerable to infections. This can make respiratory infections especially challenging during the colder months.

In 2017, scientists at the University of Southampton published a randomized controlled trial in which adults aged 50–70 took 250 mg of yeast beta‑glucan (the same ingredient used by UNILIPO) daily for 90 days during winter. Results showed a significant reduction in days with upper respiratory tract infections, along with improved innate immune function.

5. Benefits for Overweight Individuals

Overweight and obesity are often associated with chronic low-grade inflammation, making the potential metabolic effects of yeast beta-glucan particularly interesting.

Notably, some randomized controlled trials have reported reductions in waist circumference and blood pressure with daily yeast beta-glucan supplementation, even without significant weight loss.

In a 42‑day study involving 44 overweight participants, those taking one capsule (477 mg) of yeast beta‑glucan daily showed increased expression of the anti‑inflammatory cytokine IL‑10, and decreased expression of pro‑inflammatory cytokines IL‑6 and TNF‑α.

In addition to yeast β‑glucan, several other natural ingredients work synergistically to support immune health. Here's a closer look at the key ones.

Fermented Elderberry Powder

Take the most common type A influenza virus (H1N1) as an example. The virus's outer layer contains two key components: hemagglutinin (HA), which helps the virus recognize and bind to human cells for entry, and neuraminidase (NA), which releases newly formed viruses from infected cells.

Elderberry extract is suggested to work on both fronts. On one hand, it inhibits the function of hemagglutinin, preventing the virus from recognizing and attaching to human cells even if it enters the body. On the other hand, its cyanidin‑3‑sam‑bubioside binds to neuraminidase (NA), blocking several critical active sites.

By interfering with these processes, elderberry compounds may make it more difficult for the virus to enter cells and spread.

In a 2004 randomized controlled trial, participants taking elderberry experienced improvement in flu symptoms several days earlier than those receiving placebo.

Laboratory studies have also reported inhibitory activity of elderberry extracts against several respiratory pathogens – including Gram‑positive bacteria such as Streptococcus pyogenes, Gram‑negative bacteria, and influenza viruses.

What's more, fermented elderberry products – made from Italian‑sourced elderberries through a specialized microbial fermentation process – may further enhance some of elderberry's properties. This process can more than double the polyphenol content and antioxidant capacity compared to standard elderberry extracts.

That said, one crucial note: raw or unripe elderberries, as well as other parts of the plant, can contain cyanogenic compounds that may cause nausea, vomiting, and gastrointestinal discomfort.

Chlorella Vulgaris Powder

Chlorella vulgaris is a green alga and one of the most thoroughly studied aquatic algae in terms of active compounds and health benefits.

In a 2021 randomized controlled trial conducted by researchers in Taiwan, participants who consumed 27 mL of a chlorella beverage daily for 90 days showed significant improvement in antioxidant status, and their livers were effectively protected through the suppression of oxidative stress markers.

Chlorella has also been studied during pregnancy and breastfeeding. As a source of nutrients including folate, vitamin B12, and iron, researchers have explored its potential effects on maternal nutrition and pregnancy-related outcomes.

During the second and third trimesters, the chlorella group had a significantly lower incidence of anemia compared to the control group, along with reduced proteinuria and edema in late pregnancy.

Research in nursing mothers has also examined potential effects on breast milk: chlorella supplementation was associated with lower dioxin levels and higher IgA levels in breast milk.

Maitake Mushroom Powder (Grifola frondosa)

Maitake, also known as the “dancing mushroom,” was once a tribute to the Japanese imperial family. Legend has it that those who found it would dance with joy, thinking they had discovered a treasure – hence the name.

In fact, maitake is an edible mushroom that contains a variety of nutrients and bioactive compounds, including selenium. These compounds have been studied for their potential antioxidant, immune-supporting, and other health-promoting effects.

Maitake also provides a range of vitamins and minerals, making it a nutrient-rich addition to a balanced diet.

Goji Berry Extract

Many people are familiar with goji berries for their potential immune-supporting properties.

One of the most widely studied components of goji berries is goji berry polysaccharide. Studies have shown that it enhances immunity, improves gut microbiota composition, and helps support healthy blood sugar levels, making it an excellent and cost‑effective addition to daily wellness routines.