Bone Broth Benefits: What the Evidence Shows for Gut, Joints, and Sleep

Bone broth has been consumed across virtually every traditional culture for centuries — simmered bones yielding a rich, gelatinous stock prized for digestive support, joint health, and recovery. Modern nutrition research has examined these claims more rigorously, and the evidence is more nuanced than either enthusiastic advocates or sceptical dismissals suggest. Here is the 2025 evidence picture.

What Is Bone Broth?

Bone broth is made by simmering animal bones — beef, chicken, pork, or fish — for an extended period (typically 12–48 hours) with water, vegetables, and acid (vinegar). This long cooking time extracts collagen, gelatin, amino acids (particularly glycine, proline, and hydroxyproline), minerals (calcium, magnesium, phosphorus), and proteoglycans from the bone matrix and connective tissue. The result varies significantly in nutritional composition depending on the bones used, cooking time, acid added, and whether cartilage and connective tissue are included. This variability is one reason clinical research on bone broth specifically is difficult and limited.

Bone Broth Benefits: What the Evidence Shows

1. Collagen and Amino Acids — Ingredient-Level Evidence

The most honest assessment of bone broth’s benefits comes from understanding its ingredients rather than broth-level clinical trials. Bone broth contains collagen precursors (gelatin — hydrolysed collagen), glycine, proline, and hydroxyproline. These amino acids are well-evidenced for joint and skin health — but through collagen supplement research, not bone broth research directly. Cleveland Clinic (2025) notes that many broths may not provide enough collagen precursors to meaningfully boost the body’s collagen production, and that clinical benefits for skin or joints are better established for isolated collagen peptide supplements than for broth as a food. National Geographic’s 2025 science analysis reached the same conclusion: the evidence is indirect, built on ingredient plausibility rather than broth-specific trials.

2. Gut Health — Plausible but Unproven

Bone broth is frequently promoted for gut health, particularly leaky gut and intestinal permeability. The theoretical basis: gelatin coats the intestinal lining, glycine is anti-inflammatory in gut tissue, and glutamine (present in small amounts) is the primary fuel source for intestinal epithelial cells. Animal studies suggest possible anti-inflammatory effects in colitis models (PubMed 40180691, 2025). However, multiple authoritative sources including ZOE Nutrition, Cedars-Sinai, and Canadian Digestive Health Foundation explicitly state that human clinical evidence for bone broth’s gut-health benefits is limited and that gut-barrier claims remain unproven in people. For a better-evidenced gut-healing protocol, L-glutamine supplements, probiotics, and psyllium husk have significantly stronger clinical evidence than bone broth.

3. Joint Health — Better Evidence for Collagen Supplements

Bone broth is often recommended for joint pain because it contains collagen-related amino acids. However, multiple sources — including WebMD (2025) and Cedars-Sinai — state there is no solid scientific evidence that bone broth itself relieves joint pain or outperforms other protein sources for joints. The evidence for joint benefits belongs to collagen peptide supplements, which deliver standardised, concentrated amounts of the relevant amino acids in a form shown in clinical trials to improve osteoarthritis symptoms. Bone broth is an imprecise delivery vehicle for these compounds.

4. Mineral Content

Bone broth does contain minerals leached from bones during cooking — primarily calcium, magnesium, and phosphorus. However, multiple analyses show the mineral content is generally modest and variable. AARP notes that bone broth is “not a significant source of calcium” compared to dairy. The mineral contribution is real but should not be relied upon as a primary source.

5. Sleep and Anxiety — The Glycine Angle

This is perhaps bone broth’s most underappreciated potential benefit. Glycine — abundant in bone broth — is an inhibitory neurotransmitter with well-evidenced sleep-promoting and anxiolytic effects. RCTs show glycine supplementation before bed improves sleep quality and reduces next-day fatigue. Bone broth consumed in the evening provides a meaningful glycine dose in a food matrix, which may contribute to relaxation and sleep quality — though no trials have tested bone broth itself for sleep outcomes specifically.

Bone Broth vs Collagen Supplements: Which Is Better?

How to Make Bone Broth at Home

• Bones: Use mixed bones with cartilage (knuckles, feet, necks) — cartilage provides the highest gelatin yield; marrow bones add richness
• Acid: Add 2 tablespoons of apple cider vinegar per litre of water — helps extract minerals and collagen from bones
• Time: Beef bones: 18–24 hours; chicken bones: 12–18 hours; fish bones: 4–6 hours
• Test: Good bone broth should gel when cooled — if it doesn’t, it lacks sufficient gelatin and cartilage was insufficient
• Quantity: 1–2 cups daily is the amount typically recommended by practitioners using bone broth therapeutically

Frequently Asked Questions

This article is for informational purposes only. If you have specific health conditions, consult a healthcare provider or registered dietitian before using bone broth therapeutically.