# Calcium vs. Magnesium: Which Is Better for Bone Health?
Both calcium and magnesium matter for bone strength, but they work in different ways.
Calcium forms the structural foundation of bone tissue. About 99 percent of your body's calcium deposits in bones and teeth. Without adequate calcium intake, your body pulls it from bone stores, weakening the skeleton over time. The National Institutes of Health recommends 1,000 to 1,200 milligrams daily for adults.
Magnesium plays an equally critical role. It regulates calcium absorption and metabolism. Without sufficient magnesium, your body cannot properly utilize calcium, even if you consume enough. Magnesium also influences bone mineral density directly. The recommended daily intake is 310 to 420 milligrams for adults.
Research shows that both minerals work together. A study published in the journal Nutrients found that people with low magnesium levels had lower bone mineral density, regardless of calcium intake. People with optimal magnesium levels showed better bone strength.
Here's the practical reality: choosing between them is a false choice. Your bones need both. Many Americans get enough calcium through dairy products, leafy greens, and fortified foods. But magnesium deficiency is more common. Food sources of magnesium include almonds, pumpkin seeds, spinach, and dark chocolate.
The ratio matters too. A magnesium-to-calcium ratio of 1:2 appears optimal for bone health, though some research suggests flexibility in this range.
If you're concerned about bone density, especially as you age, focus on getting both minerals through food first. Supplements work when diet falls short, but whole foods provide additional nutrients that support bone health broadly. Vitamin D helps both minerals absorb effectively, so adequate sun exposure or supplementation strengthens the whole picture.