The Bone Broth Phenomenon

Bone broth has become one of the most widely recommended remedies in the gut health space. Proponents claim it heals leaky gut, reduces inflammation, soothes the intestinal lining, and provides essential building blocks for gut repair. It has spawned a multi-billion dollar industry of bottled broths, bone broth protein powders, and bone broth-based supplements. But how much of this is supported by actual evidence, and how much is marketing built on plausible but unverified mechanisms?

The honest answer is that bone broth likely provides some genuine benefits for gut health, but the evidence base is far thinner than the enthusiasm suggests. Understanding what bone broth actually contains and what those components can and cannot do allows you to make informed decisions about its role in your gut health strategy.

What Bone Broth Actually Contains

When bones, connective tissue, and cartilage are simmered for 12 to 48 hours, the following compounds are extracted:

  • Collagen and gelatin — collagen breaks down into gelatin during cooking; further digestion produces the amino acids glycine, proline, and hydroxyproline
  • Glycine — a conditionally essential amino acid involved in glutathione production, bile acid conjugation, and gut mucosal protection
  • Glutamine — the primary fuel source for enterocytes (intestinal lining cells); important for gut barrier maintenance
  • Glycosaminoglycans — including glucosamine, chondroitin, and hyaluronic acid from cartilage and connective tissue
  • Minerals — calcium, magnesium, phosphorus, and potassium, though amounts vary widely depending on preparation
The nutrient content of bone broth is highly variable. A 2017 analysis published in Food and Nutrition Research found that the mineral content of bone broth was much lower than commonly claimed. The amino acid profile is more reliable, but concentrations depend on cooking time, bone type, and whether acidic ingredients (vinegar) are added.

The Evidence For Gut Benefits

Glycine and Gut Protection

Glycine, one of the most abundant amino acids in bone broth, has genuine evidence for gut protection. Animal studies show that glycine supplementation reduces intestinal inflammation, protects against chemically induced colitis, and improves intestinal barrier function. Glycine also supports glutathione production, the body's primary intracellular antioxidant. However, most studies used purified glycine supplements at doses higher than what a typical serving of bone broth provides.

Glutamine and Enterocyte Fuel

Glutamine is the primary energy source for small intestinal epithelial cells and has a substantial evidence base for supporting gut barrier integrity. However, bone broth contains relatively modest amounts of glutamine (typically 300 to 500 mg per cup). Clinical studies showing gut barrier benefits typically use 5 to 30 grams of supplemental glutamine daily, which would require drinking 10 to 60 cups of bone broth. The glutamine content of bone broth is a contribution, not a therapeutic dose.

Gelatin and the Gut Lining

Gelatin has been shown to support mucosal integrity in animal models. A study in rats found that gelatin supplementation protected against ethanol-induced mucosal damage. Gelatin also stimulates gastric acid secretion, which may benefit digestion in individuals with hypochlorhydria. The human evidence, however, is limited to these extrapolations from animal data.

The Evidence That Is Missing

Despite the widespread claims, there are no published randomised controlled trials specifically testing bone broth for gut healing in humans. The studies that exist have tested individual components (glycine, glutamine, gelatin) as isolated supplements, not bone broth as a food. This does not mean bone broth is ineffective, but it does mean that the specific claims about "healing leaky gut" with bone broth are not directly supported by clinical trial data.

What Bone Broth Can Reasonably Do

  • Provide a source of easily digestible amino acids during gut healing protocols when solid food is poorly tolerated
  • Contribute glycine and proline for collagen synthesis and mucosal support
  • Serve as a warm, soothing liquid that encourages hydration during illness or gut flares
  • Replace ultra-processed broths and stocks that contain additives and MSG
  • Contribute modest amounts of gut-supportive amino acids as part of a broader healing protocol

How to Use Bone Broth Wisely

  • View it as a supportive food, not a cure — bone broth works best as part of a comprehensive gut health protocol that includes dietary diversity, prebiotic fibre, fermented foods, and lifestyle modifications
  • If making your own, simmer bones for at least 24 hours with a tablespoon of apple cider vinegar to maximise mineral and collagen extraction
  • Choose quality bones from grass-fed, organic sources to minimise heavy metal contamination (a legitimate concern with long-simmered broths)
  • For serious gut healing, consider supplemental L-glutamine (5 to 10 grams daily) alongside bone broth to achieve therapeutic doses

GutIQ helps you build a comprehensive gut health strategy where bone broth can play a supporting role alongside the dietary, lifestyle, and supplemental interventions that have the strongest evidence base for genuine gut healing.