How Much Calcium Is In Bone Broth? | The Surprising Truth

Bone broth has a reputation that precedes it. The idea that simmering bones for hours creates a mineral-rich elixir — especially one packed with calcium for strong bones — is deeply embedded in wellness culture. The name itself suggests a direct transfer of strength from animal bone to human bone.

The reality is that calcium levels in bone broth vary dramatically, and they rarely live up to the hype. Depending on the bones, cooking time, and whether you add acid, a cup of bone broth might deliver anywhere from 9 mg to 68 mg of calcium. That is a far cry from the 300 mg you would get from a single cup of milk.

What The Research Actually Finds

Multiple studies have tried to pin down an exact number for bone broth’s calcium content, but the results are all over the map. A 2017 study published in a peer-reviewed journal analyzed several commercial and homemade broths. It reported calcium levels ranging from 1.5 mg to 55 mg per 240 ml serving.

USDA data cited by the Canadian Digestive Health Foundation puts the range slightly higher, at 12 to 68 mg per 250 ml. However, more recent USDA figures suggest a tighter window of 9 to 14 mg per cup. This wide variance makes it difficult to rely on bone broth as a consistent calcium source.

For context, the 55 mg high end represents roughly 4% of the US Recommended Daily Value for calcium. Most commercial broths fall closer to the bottom of this range, often listing 0% to 4% DV on their labels. It is a background mineral, not a feature.

Why The “Bone For Bone” Myth Sticks

The idea that drinking broth made from bones strengthens your own skeleton is an ancient concept known as the doctrine of signatures. It is intuitive, but nutrition science rarely works that cleanly. Calcium is locked inside the bone matrix, and getting it into water requires specific conditions that are not always met in a standard recipe.

• Acid helps, but it is not magic: Adding vinegar or lemon juice is a common trick to pull calcium from bones. While acid does help mineral extraction, the total calcium released still remains low compared to dairy sources.
• Bones need company: Broth made solely from meaty bones or feet, which are rich in collagen, may not contribute much calcium. Calcium is stored in the hard, dense parts of the bone, which require long simmer times to break down.
• Time is a factor, not a guarantee: A 24-hour simmer will extract more minerals than a 2-hour stock. But even prolonged boiling does not guarantee you will end up with a calcium-rich broth.
• Commercial shortcuts: Many store-bought bone broths are diluted or made with short cooking times for flavor and cost efficiency. They often contain negligible calcium.

The mineral content of bone broth is highly variable, and the marketing often outpaces the science. A 2025 study highlights that bone broth does contain valuable amino acids and minerals like calcium, but the amounts are not standardized.

Factors That Change Calcium Bone Broth Content

If you are trying to get meaningful calcium from bone broth, the preparation details matter more than the recipe name. Healthline’s overview of bone broth preparation factors notes that bone type, cooking duration, and added acid all influence the final mineral profile.

A chicken bone broth simmered for 8 hours will look different on a nutrition label than a beef knuckle broth simmered for 24 hours with a splash of vinegar. The table below breaks down how these variables affect the calcium outcome.

Factor	Effect on Calcium Content	Typical Result (per cup)
Bone Type (Knuckle vs. Meat)	Knuckles and joints have a denser mineral matrix.	Higher end of range (40-68 mg)
Added Acid (Vinegar)	Helps dissolve calcium phosphate from bones.	May increase extraction by 10-20 mg
Simmer Time (2 hrs vs. 24 hrs)	Longer simmer allows more mineral release.	Marginal increase after 12 hours
Homemade vs. Commercial	Commercial broths are often diluted or short-cooked.	Typically 0-10 mg / less than 4% DV
Water Ratio	More water relative to bones dilutes minerals.	Lower concentration of all extracted nutrients

Understanding these variables is key. A carefully prepared broth may offer a modest amount of calcium, but it will rarely rival traditional dietary sources.

How To Maximize Calcium Extraction At Home

For those committed to getting the most out of their homemade broth, a few evidence-backed adjustments can shift the calcium content toward the higher end of the range. These steps are based on how calcium behaves during cooking.

1. Use a mix of bone types. Include some knuckles, joints, or marrow bones alongside meaty bones. The dense, weight-bearing bones contain more calcium than meat or skin.
2. Add an acid source. A tablespoon of apple cider vinegar or lemon juice per gallon of water helps release calcium from the bone matrix. It is a standard technique in traditional broth making.
3. Simmer low and slow. Aim for 12 to 24 hours. While the bulk of collagen extracts in the first few hours, minerals like calcium take longer to leach into the water.
4. Skip the salt until the end. Salt does not aid mineral extraction. Adding it early can make the broth overly salty if it reduces significantly during a long simmer.

Even with these steps, the resulting calcium content will be modest. A highly optimized homemade broth might reach 50-70 mg per cup, which is roughly 5% of your daily needs.

How It Compares To Other Calcium Sources

To put bone broth’s calcium content into perspective, it helps to compare it against standard dietary sources. A 2025 study on minerals in bone broth confirmed the presence of calcium, magnesium, and phosphorus, but emphasized that absolute amounts depend heavily on the starting materials.

When stacked against dairy, fortified foods, or even leafy greens, bone broth falls short as a primary calcium source. It is better understood as a source of collagen and amino acids that happens to contain some minerals.

Food Source	Serving Size	Approx. Calcium Content
Whole Milk	1 cup (240 ml)	300 mg
Plain Yogurt	1 cup (245 g)	300-400 mg
Cooked Kale	1 cup (130 g)	90-100 mg
Bone Broth (typical)	1 cup (240 ml)	9-68 mg

The comparison highlights a clear nutritional gap. Relying on bone broth for calcium would require drinking several quarts a day to meet the recommended intake of 1000-1200 mg for most adults.

The Bottom Line

Bone broth is a flavorful, collagen-rich food that contributes a modest amount of calcium to the diet, but it is not a calcium powerhouse. The amount varies wildly based on preparation, and even the best homemade versions deliver far less calcium than a glass of milk. It is a background player in the mineral department, not a primary source.

If you are looking to shore up your calcium intake for bone health, your best bet is to talk to a registered dietitian or your doctor about your specific dietary patterns and needs before relying on broth as a solution.