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| A cup of cooked collard greens has nearly as much calcium as a cup of milk. That surprised me — I’d always put greens in the “maybe a little” tier, well behind dairy. But the gap is smaller than I thought, and absorption turns out to matter as much as intake. (The Got Milk? campaign was really effective.)
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| Below, health coach Michelle Steil explains where calcium really comes from, why your body’s ability to use it depends on more than what's on your plate, and what you can do beyond food to keep your bones strong.
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Let’s put it to the expert,
Tim Snaith
Newsletter Editor, Healthline
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Written by Tim Snaith
May 14, 2026 • 3 min read |
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| Q: |
Is the calcium from dairy easier to absorb than the calcium from greens? |
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| A: |
Many foods contain the essential mineral, and most of the body’s requirements can be met through nutrition. Milk, yogurt, and cheese are, of course, rich in calcium. Some foods are fortified with calcium, such as orange juice and cereal. Calcium is also available in supplements.
Given the strong emphasis on dairy, you may wonder whether all food sources are equal when it comes to calcium. The answer is, yes and no. For example, the U.S. Department of Agriculture tells us that:
- 1 cup of cooked collard greens yields 268 milligrams (mg) of calcium
- 1 cup of 2% milk yields 309 mg of calcium
- 1 cup of cheddar cheese yields 742 mg of calcium
But the amount of calcium in milligrams each food contains is only part of the story. How much calcium your body actually absorbs varies significantly by source.
Dairy typically has an absorption rate of around 20 to 50%. Spinach, despite its calcium content, delivers as little as 5%, because oxalates and phytates in the plant bind to calcium, leaving less available for your body to use. Other leafy greens — kale, bok choy, broccoli — absorb at rates much closer to dairy. So the type of plant source matters as much as the amount.
How much calcium your body actually absorbs from food also depends on other factors, with vitamin D being the most important. Without enough of it, absorption drops. Illness, genetics, and hormones also play a role, so it’s worth checking in with your doctor before starting any supplement.
Unless you have sensitivities or lactose intolerance, the food choice that best fits your calcium needs is really a matter of personal preference. Certain leafy green vegetables, fish with bones, nuts, seeds, and legumes provide alternative sources. If your digestive system does not tolerate a lot of fiber, then opt for dairy.
Bone loss picks up with age, and conditions like osteopenia and osteoporosis can develop along the way. But food isn’t your only defense — strength training builds bone density independently of diet, so there’s real upside to working out, even if your calcium intake isn’t perfect.
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| Want to learn more about food, diets, cooking, or some other nutrition subject? Let us know at nutritionedition@healthline.com and we’ll look into it for you! (Heads up, we may use your response in an upcoming newsletter.)
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| What we’re digesting |
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