Third Biome
Your gut makes a molecule every day. When you have enough, your gut lining is strong, your inflammation is low, your energy is steady, and your mood is stable. When it runs out—because of antibiotics, stress, processed food, or a changing Indian diet—everything starts to fall apart.
Bloating starts. The acidity doesn't go away. You lose your focus. The energy crashes at 3:00 p.m. You can't explain the cycle because no one told you about this molecule.
This substance is called “butyrate” and is classified as a postbiotic. And it is the most important part of everything Third Biome is making.
What Is Butyrate?
Butyrate is a short-chain fatty acid (SCFA), especially a four-carbon fatty acid, created by gut bacteria as they ferment dietary fiber. Along with propionate and acetate, it is one of the colon's three main SCFAs. Butyrate is the most clinically relevant and physiologically active of them.
The colonocyte, an epithelial cell that makes up the lining of the gut, is the main user of butyrate. About 70% of the energy used by colonocytes comes straight from butyrate. This is not a small dependence. It serves as the primary source of energy for the cells that make up your intestinal barrier. A decrease in butyrate availability causes colonocytes to starve, the gut lining to deteriorate, and a series of downstream consequences that millions of Indians deal with on a daily basis.
Butyrate is not a supplement trend. It is a foundational molecule that your gut cannot function without. The problem is not that we need to add it artificially — it is that modern Indian life has systematically destroyed our capacity to produce it.
How Butyrate Is Made and Why It Doesn't Work
Under ideal circumstances, the colon's bacterial fermentation of dietary fiber continuously produces butyrate. Butyrivibrio, Roseburia, Eubacterium, and Faecalibacterium are the main bacterial genera that produce butyrate. Anaerobic bacteria require precise conditions, including dietary fiber, a regulated gut pH, lack of disruptive chemicals, and sufficient time.
Each of these factors is increasingly affecting urban Indians:
• Low dietary fiber intake: The move away from traditional Indian diets—rich in whole grains, lentils, and vegetables—towards ultra-processed foods, fast food, and desk-based eating habits has significantly reduced the nutrients needed to support butyrate-producing bacteria.
• Impact of antibiotics: Even a single course of broad-spectrum antibiotics can reduce populations of Faecalibacterium prausnitzii—a key butyrate producer—by more than 90%. Recovery may take months or even years and often does not return to original levels without targeted support.
• Chronic stress: Elevated cortisol levels can directly reduce the diversity and activity of gut microbiota, including butyrate-producing species. Many urban professionals in India experience persistent stress, which continuously weakens butyrate production.
• Overuse of PPIs and antacids: Prolonged use of proton pump inhibitors alters gut pH and disrupts the microbial environment, making it less favorable for butyrate-producing bacteria. India has one of the largest markets for antacids globally.
• Lack of adequate sleep: Gut microbiota operate on a circadian rhythm, with gut repair and butyrate production primarily occurring at night. Sleeping less than 6 hours disrupts this cycle, leading to reduced butyrate production.
What Butyrate Does in the Body: Five Mechanisms
1. Fuels and Seals the Gut Lining
Colonocytes use butyrate as their primary energy source, which in turn drives the production and maintenance of tight junction proteins—the molecular seals between gut lining cells. When butyrate is abundant, the gut barrier is intact: food stays in the digestive tract, toxins stay out of the bloodstream, and the immune system is not continuously activated by foreign material. When butyrate runs out, tight junctions loosen and the gut becomes more permeable, which is often called "leaky gut." This causes inflammation throughout the body.
2. Adjusts the Immune Response
The gut-associated lymphoid tissue contains more than 70% of the immune system. Butyrate functions as a histone deacetylase inhibitor, or HDAC inhibitor, which lowers the expression of inflammatory genes and encourages the development of regulatory T cells (Tregs), the immune system's peacekeepers. According to clinical studies, butyrate supplementation increases anti-inflammatory IL-10 while lowering pro-inflammatory cytokines such TNF-alpha, IL-6, and IL-12. IBS, PCOD, acidity, and skin disorders are all closely related to this system.
3. Powers the Gut-Brain Axis
Butyrate nourishes the 500 million neurons that make up the gut's neuronal network, which is sometimes referred to as the "second brain." It increases the activity of the vagus nerve, which transmits signals from the gut to the brainstem. It promotes the synthesis of neurotrophic factors, which preserve the integrity of the neural network in the gut. Additionally, it lowers systemic inflammation that impedes dopamine and serotonin signaling and crosses the blood-brain barrier by preserving a healthy gut lining. For many urban Indians, butyrate deficiency can create symptoms such as brain fog, mood dips, and anxiety without an obvious reason.
4. Regulates Metabolic Function
Butyrate affects systemic metabolism in several ways. By stimulating GPR109A and GPR41 receptors in gut and metabolic cells, it increases insulin sensitivity. By encouraging fatty acid oxidation in the liver, it lessens the buildup of fat. Additionally, it controls appetite signaling via the hormones GLP-1 and PYY, which tell the brain when a person is full. Because of these pathways, butyrate is extremely significant to India's metabolic health issue; butyrate-mediated components are present in diabetes, obesity, PCOD, and nonalcoholic fatty liver disease.
5. Promotes the Recovery of the Gut Microbiome
By reducing intestinal pH, butyrate promotes the growth of beneficial bacteria while suppressing harmful bacterial species and maintaining commensal microbiota. Additionally, it directly promotes the growth of epithelial stem cells in the intestinal lining, aiding in the restoration of structural integrity following damage from sickness, inflammation, or antibiotics.
Why Butyrate Is Missing from Most Gut Health Supplements
Butyrate is not directly delivered by the vast majority of gut health products available in India, including probiotics, fiber blends, and digestive enzymes. In a healthy gut, probiotics may eventually encourage bacteria that produce butyrate. These bacteria are fed by prebiotic fiber. However, in a dysbiotic gut with decreased butyrate-producing bacteria due to antibiotics and stress, neither strategy effectively restores butyrate levels.
This is the gap that the Third Biome was designed to bridge. By delivering butyrate directly to the gut lining, Thirdbiome GTB avoids the requirement for a healthy microbiome, avoids the stomach acid that would break down unprotected butyrate, and delivers it exactly where colonocytes need it.
Thirdbiome GTB: Delivering Butyrate with Precision
Traditional butyrate supplements have had two main problems: they smell bad (butyric acid has a strong rancid butter smell) and they are quickly absorbed in the upper gut, which stops them from getting to the colon properly. Third Biome addresses both issues with its innovation—Thirdbiome GTB (microencapsulated glycerol tributyrate).
Thirdbiome GTB acts as a natural prodrug of butyrate, meaning the body converts it into free butyric acid in the intestine through normal lipase activity. Its microencapsulation technology:
- Eliminates odour by enclosing the volatile compound
- Protects it from degradation in gastric acid, ensuring it reaches the intestine intact
- Enables targeted release of butyrate at intestinal pH, directly at the gut lining
- Provides shelf stability without the need for refrigeration — ideal for the Indian supply chain
This means the supplement provides the advantages of butyrate—a vital postbiotic that is often missing in the gut—with a level of trustworthiness that probiotic and prebiotic options might not offer, particularly for an unhealthy gut in India.
Foods That Help Make Butyrate
Thirdbiome GTB gives you butyrate directly, but it's also necessary to eat foods that help your body make butyrate naturally. Foods that help bacteria make butyrate are:
• Resistant starch: Faecalibacterium and Roseburia species eat cooked and cooled rice, cooked and cooled potatoes, green bananas, and raw oats.
• Idli, dosa, kanji, and buttermilk are traditional Indian fermented meals that provide both fiber and lactic acid bacteria that help make SCFA.
• Legumes: Dal, rajma, and chana are the most important foods in Indian cookery. They are also excellent sources of the fermentable fiber that butyrate-producing bacteria love.
• Whole grains: Whole wheat, millets (ragi, jowar), and brown rice are all good sources of complex carbs that keep SCFA production going all day.
Frequently Asked Questions
Q: What does butyrate do for the gut?
A: Butyrate is the primary fuel source for colonocytes—the cells that form your gut lining. It seals the gut barrier, reduces inflammation, supports the gut-brain axis, improves insulin sensitivity, and creates conditions that favor beneficial gut bacteria. It is the most important postbiotic your gut produces.
Q: How do I know if I am butyrate deficient?
A: Common signs of butyrate deficiency include chronic bloating, acidity, constipation or diarrhoea, brain fog, 3pm energy crashes, frequent illness, mood instability, and skin conditions like acne or eczema. These are the downstream effects of a weakened gut lining and chronic gut inflammation. Take the Third Biome Gut Health Quiz at thirdbiome.com to assess your gut health score.
Q: Can I take a butyrate supplement?
A: Yes. Thirdbiome GTB is India's first clinically formulated butyrate postbiotic supplement. Available through the T3B Club at thirdbiome.com, it delivers butyrate directly to the gut lining in a form that survives stomach acid and requires no refrigeration.
Q: Is butyrate the same as a postbiotic?
A: Butyrate is the most clinically significant postbiotic molecule. Postbiotics include a range of beneficial compounds produced by gut bacteria — butyrate is the most studied and most therapeutically relevant of these. When Third Biome refers to its postbiotic supplement, it specifically means butyrate delivered via Thirdbiome GTB (microencapsulated Glycerol Tributyrate).
Q: Which foods are high in butyrate?
A: Butyrate is not significantly present in food directly but is produced by gut bacteria fermenting resistant starch and dietary fiber. Foods that most effectively support butyrate production include cooled cooked rice, green bananas, traditional fermented foods like idli and buttermilk, legumes, and whole grains.
Ready to experience the postbiotic difference? Third Biome's Biome Balance, powered by Thirdbiome GTB, is India's first patented postbiotic capsule—developed in Chennai, backed by science, and tailored for the Indian gut. Join the T3B Club waitlist at thirdbiome.com and take our free Gut Health Quiz to find your gut health score in just 3 minutes.