Bone broth contains collagen and amino acids, but the evidence for specific health claims is mixed

Bone broth is made by simmering animal bones (usually chicken, beef, or fish) in water for 12 to 48 hours, often with vegetables and vinegar. The long cooking breaks down collagen in the bones into gelatin and smaller protein fragments called amino acids. When you drink bone broth, you're consuming these breakdown products—not intact collagen, which your digestive system breaks apart into individual amino acids anyway.

The claim that bone broth "rebuilds" collagen in your joints, skin, or gut rests on the idea that consuming gelatin or specific amino acids like glycine and proline will preferentially rebuild those tissues. Human studies on this are sparse. What we know is that your body uses amino acids from all protein sources—bone broth, chicken breast, eggs, beans—to build whatever proteins it needs, based on your genetics, age, and activity level, not based on which amino acids you ate. Bone broth is a source of protein and certain amino acids, but it is not uniquely restorative.

Key Takeaways

  • Bone broth contains gelatin and amino acids from collagen breakdown, but your digestive system breaks these down further before your body uses them.
  • Animal studies show glycine and proline (amino acids in bone broth) may support joint and gut tissue, but human evidence is limited to small trials and observational data.
  • Bone broth is a source of protein and minerals like calcium and magnesium, though the mineral content varies widely depending on how it is made and what bones are used.
  • The same amino acids and minerals found in bone broth are available from other foods—regular broth, meat, eggs, and leafy greens—often at lower cost and with less preparation time.

What amino acids are actually in bone broth

Bone broth is rich in glycine, proline, and hydroxyproline—amino acids that make up a large portion of collagen. A typical cup of bone broth (about 240 ml) contains roughly 10 to 15 grams of protein, with glycine making up a significant fraction of that. These amino acids are less common in muscle meat (chicken breast, steak) but abundant in connective tissue, which is why bone broth is a practical way to consume them if you want to.

The question is whether eating more glycine and proline leads to more collagen in your body. In animal studies, glycine supplementation has shown some effect on cartilage repair and wound healing, and proline appears in studies of bone density. However, these are not the same as drinking bone broth. Animal studies use isolated amino acids at controlled doses, often in disease models (injured joints, broken bones). Human trials on bone broth itself are small and often measure markers (like blood collagen fragments) rather than actual tissue changes. A 2019 review in the journal Nutrients concluded that while collagen peptides (a processed form of gelatin) show promise for joint and skin health, the evidence remains "preliminary" and most studies are short-term.

Joint and gut health claims: what the research shows

The most common claim is that bone broth supports joint health and reduces inflammation. The mechanism proposed is that gelatin and glycine reduce cartilage breakdown and support the gut barrier, which in turn reduces systemic inflammation. In animal models of arthritis, gelatin and glycine have shown modest protective effects. In humans, a small 2017 trial published in Nutrients found that collagen peptides reduced joint pain in athletes during exercise, though the study was short (24 weeks) and involved only 139 people.

For gut health, the claim is that bone broth "seals" a leaky gut by providing amino acids that repair the intestinal lining. This idea comes from animal research showing that glutamine (another amino acid in bone broth) supports intestinal barrier function. However, no large human trials have tested whether drinking bone broth repairs gut permeability or improves digestive symptoms. Most evidence for gut barrier repair comes from studies of isolated amino acids or collagen peptides in controlled doses, not from consuming broth. If you have inflammatory bowel disease or celiac disease, bone broth is not a substitute for medical treatment.

Mineral content and bone health

Bone broth does contain minerals leached from bones during cooking, including calcium, magnesium, phosphorus, and potassium. The amount varies dramatically depending on the type of bones used, the cooking time, the pH of the liquid (vinegar lowers pH and increases mineral extraction), and the brand or recipe. A 2017 analysis in Nutrition and Metabolism tested 10 commercial bone broths and found calcium content ranging from 5 to 45 mg per cup—a 9-fold difference. Some contained more minerals than others, and none came close to the 1,000 mg daily target for most adults.

This means bone broth can contribute to your mineral intake, but it is not a reliable source on its own. If you are using bone broth to support bone health, you would still need other calcium and magnesium sources—dairy, leafy greens, seeds, or a supplement. The minerals in bone broth are real, but the amount is unpredictable and modest.

How bone broth compares to other protein sources

A cup of bone broth contains roughly 10 to 15 grams of protein, similar to a cup of regular chicken or beef broth (which also contains collagen and gelatin, though less). A single egg contains 6 grams of protein plus choline and lutein. A 3-ounce serving of cooked chicken contains 26 grams of protein. A cup of cooked lentils contains 18 grams of protein plus fiber and polyphenols.

If your goal is to consume glycine and proline, bone broth is an efficient source. If your goal is total protein intake, muscle meat is more concentrated. If your goal is minerals, leafy greens and seeds deliver more per serving. Bone broth is not inferior to these options—it is straightforward different, and the choice depends on what you are trying to achieve and what fits your budget and cooking time. Homemade bone broth is cheaper than store-bought collagen powder but requires 12 to 48 hours of simmering. Commercial bone broth is convenient but costs more per serving than making it yourself.

Potential downsides and who should be cautious

Bone broth is generally safe for most people, but there are a few considerations. Bones can accumulate heavy metals like lead, especially in older animals or animals raised in contaminated environments. A 2013 study in Food and Chemical Toxicology found detectable lead in bone broth samples, though at levels below EPA safety thresholds. If you are pregnant, nursing, or giving broth to young children, sourcing from grass-fed or organic animals may reduce this risk, though it does not eliminate it.

Bone broth is also high in sodium if you add salt during cooking, and it contains purines (breakdown products of nucleic acids from bone marrow) that may trigger gout flares in people with gout or high uric acid. If you have kidney disease, the mineral and protein load should be discussed with your doctor. For most healthy adults, occasional consumption of bone broth poses no known risk.

How to make or choose bone broth

Homemade bone broth requires bones (chicken, beef, or fish), water, and time. Roasting the bones first (at 400°F for 30 to 45 minutes) deepens flavor. Add the roasted bones to a pot with water, bring to a simmer, and maintain a gentle simmer for 12 to 48 hours. Adding 1 to 2 tablespoons of vinegar (apple cider or white vinegar) lowers the pH and increases mineral extraction. Strain through a fine sieve or cheesecloth. The broth will gel when cooled due to gelatin content, which is a sign of collagen breakdown.

If you buy commercial bone broth, check the label for sodium content (many brands add 500 to 900 mg per cup), the source of bones (grass-fed beef or pasture-raised chicken is preferable), and whether it contains added gelatin or collagen (some brands do, which increases the amino acid content but means it is not purely bone-derived). Shelf-stable broths in cartons or bottles are pasteurized; refrigerated versions in glass jars are not. Neither is inherently better, though refrigerated versions may retain more heat-sensitive compounds if they exist.

Frequently Asked Questions

Does bone broth have collagen in it?

Bone broth contains gelatin and amino acids from collagen breakdown, not intact collagen. Your digestive system breaks gelatin into individual amino acids before absorption. These amino acids are then used by your body to build proteins where needed, not preferentially to rebuild collagen in skin or joints.

Can bone broth heal a leaky gut?

Animal studies suggest that amino acids in bone broth, particularly glutamine, may support intestinal barrier function. Human evidence is limited. Bone broth is not a treatment for inflammatory bowel disease, celiac disease, or other digestive conditions. If you have chronic gut symptoms, consult a doctor or registered dietitian.

How much bone broth should I drink?

There is no established daily dose. Most people who consume bone broth drink 1 to 2 cups per day. At this amount, you are adding 10 to 30 grams of protein and modest amounts of minerals to your diet. More is not necessarily better, and bone broth should not replace other protein and nutrient sources.

Is store-bought bone broth as good as homemade?

Commercial bone broth contains similar amino acids and minerals to homemade versions, though the exact amounts vary by brand and recipe. Homemade broth is cheaper if you have time to simmer it; store-bought is more convenient. Check labels for sodium content and bone sourcing, as these vary widely between brands.

Can I get the same amino acids from regular broth or gelatin?

Yes. Regular chicken or beef broth contains gelatin and amino acids, though usually less than bone broth. Unflavored gelatin powder is a concentrated source of the same amino acids. Collagen peptides (hydrolyzed collagen) are also available as a supplement. All three provide glycine and proline; bone broth is straightforward one option.