Top 9 Calcium Supplements of 2025 Endorsed by Dietitians

Calcium plays a crucial role in maintaining strong bones, proper muscle function, and overall health. However, many people struggle to get enough calcium from diet alone. This is where calcium supplements can bridge the nutritional gap. Our team consulted with leading dietitians to bring you the most effective calcium supplements of 2025.

Why Calcium Matters for Your Health

Calcium is the most abundant mineral in your body. About 99% of it resides in your bones and teeth. Beyond bone health, calcium supports nerve transmission, muscle contraction, and blood clotting. Without adequate calcium, your body will take what it needs from your bones, potentially leading to weakened bones and osteoporosis over time.

According to the National Institutes of Health, adults need between 1,000 to 1,200 mg of calcium daily. Yet, studies show that over 40% of Americans don’t meet these requirements through diet alone.

How We Selected the Top Calcium Supplements

Our selections were based on several key factors:

• Form of calcium (bioavailability)
• Additional nutrients that enhance absorption
• Third-party testing and quality certifications
• Dosage appropriateness
• Value for money
• Registered dietitian recommendations

Let’s explore the top calcium supplements that made our list for 2025.

Top 9 Calcium Supplements of 2025

1. Thorne Basic Bone Nutrients

Thorne stands out as our top pick because of its comprehensive bone-supporting formula. This supplement combines calcium citrate with vitamin D3, vitamin K2, and magnesium—all critical nutrients that work together to improve calcium absorption and utilization.

Registered dietitians particularly appreciate that Thorne uses calcium citrate instead of calcium carbonate. The citrate form is generally better absorbed, especially for people with low stomach acid. Additionally, Thorne maintains rigorous quality testing standards and holds NSF certification for sport.

• Form: Calcium citrate (200 mg per serving)
• Added nutrients: Vitamin D3, K2, and magnesium
• Best for: Overall bone health support
• Price: $32 for 60 servings

2. Pure Encapsulations Calcium Citrate

Pure Encapsulations offers a hypoallergenic calcium citrate supplement free from common allergens. This makes it ideal for those with sensitivities. The formula is simple yet effective, providing 150 mg of calcium per capsule.

Dietitians recommend this brand for its commitment to purity. All products undergo third-party testing for potency and contaminants. The company also uses non-GMO ingredients and avoids artificial additives.

• Form: Calcium citrate (150 mg per capsule)
• Added nutrients: None (pure formula)
• Best for: Those with allergies or sensitivities
• Price: $18.80 for 180 capsules

3. Garden of Life Vitamin Code Raw Calcium

For those seeking a plant-based calcium option, Garden of Life delivers with its whole-food approach. This supplement sources calcium from organic algae, along with 73 trace minerals naturally occurring alongside it.

What makes this supplement special is its inclusion of probiotics and enzymes to enhance digestion and absorption. Dietitians note that the vitamin D3 in this formula is vegan (derived from lichen), making it suitable for plant-based diets.

• Form: Plant-based calcium from algae (756 mg per serving)
• Added nutrients: Vitamin D3, K2, magnesium, plus probiotics and enzymes
• Best for: Vegans and those preferring whole-food supplements
• Price: $44 for 30 servings

4. NOW Foods Calcium & Magnesium

NOW Foods offers an excellent value option that doesn’t compromise on quality. Their calcium and magnesium formula provides calcium citrate paired with magnesium, creating an ideal ratio for absorption and utilization.

Dietitians frequently recommend this product for those on a budget. Despite its affordable price, NOW Foods maintains high-quality standards with in-house testing facilities and GMP certification.

• Form: Calcium citrate (500 mg per serving)
• Added nutrients: Magnesium, zinc, and vitamin D
• Best for: Budget-conscious consumers
• Price: $17 for 120 tablets

5. New Chapter Calcium Complete with D3 + K2

New Chapter takes a plant-based approach with their calcium supplement. The calcium comes from algae and is delivered in a form that’s slim and easy to swallow. Furthermore, they use fermented nutrients for better digestibility.

Dietitians highlight that this supplement can be taken on an empty stomach, which sets it apart from many other calcium products. The formula includes clinical-strength plant calcium with vitamin D3 and K2 to direct calcium to your bones.

• Form: Plant-based calcium from algae (320 mg per serving)
• Added nutrients: Fermented vitamin D3 and K2
• Best for: Those with sensitive stomachs
• Price: $36 for 60 tablets

6. Designs for Health Calcium Malate

Designs for Health uses calcium malate, which offers excellent absorption and bioavailability. This professional-grade supplement is often recommended by healthcare practitioners for those with specific absorption concerns.

The company focuses on science-based formulations and maintains stringent quality control. Dietitians appreciate that this calcium form tends to cause fewer digestive issues than other types.

• Form: Calcium malate (250 mg per capsule)
• Added nutrients: None (pure calcium malate)
• Best for: Those with absorption issues
• Price: $28 for 120 capsules

7. Life Extension Calcium Citrate with Vitamin D3

Life Extension combines calcium citrate with vitamin D3 for enhanced absorption. Their commitment to science-backed formulations makes this supplement a reliable choice for those focused on longevity and health optimization.

Dietitians note that Life Extension goes beyond industry standards for quality testing. Their supplementation protocol is based on the latest research, and they frequently update formulations to reflect new findings.

• Form: Calcium citrate (300 mg per serving)
• Added nutrients: Vitamin D3
• Best for: Science-focused consumers
• Price: $19 for 100 capsules

8. Nordic Naturals Calcium with Magnesium

Nordic Naturals brings their reputation for high-quality fish oils to the calcium supplement market. Their calcium-magnesium formula uses calcium citrate and provides an ideal 2:1 ratio of calcium to magnesium.

What dietitians love about this option is its smooth digestion profile and the company’s commitment to sustainability. All products are tested by third-party labs for purity and potency.

• Form: Calcium citrate (250 mg per serving)
• Added nutrients: Magnesium
• Best for: Those seeking balanced mineral support
• Price: $26 for 120 tablets

9. Solgar Calcium Citrate with Vitamin D3

Solgar has been making supplements since 1947, and their experience shows in this classic calcium formula. Using highly absorbable calcium citrate paired with vitamin D3, this supplement provides reliable bone support.

Dietitians recommend Solgar for their consistent quality and traditional approach to supplementation. Their products undergo rigorous testing, and the company maintains GMP certification.

• Form: Calcium citrate (200 mg per tablet)
• Added nutrients: Vitamin D3
• Best for: Those who prefer established brands with long histories
• Price: $20 for 120 tablets

How to Choose the Right Calcium Supplement for You

With so many options available, selecting the right calcium supplement can feel overwhelming. Consider these factors when making your decision:

Calcium Form Matters

Different calcium forms offer varying levels of absorption:

• Calcium citrate: Generally well-absorbed, can be taken with or without food
• Calcium carbonate: Contains more elemental calcium but requires stomach acid for absorption (take with meals)
• Calcium malate: Easily absorbed and gentle on the digestive system
• Plant-based calcium: Often contains naturally occurring co-factors that may enhance absorption

Consider Your Specific Needs

Your personal health situation should guide your choice:

• If you’re over 50, look for higher vitamin D content to enhance absorption
• Those with digestive issues may benefit from calcium citrate or malate
• Vegans should seek plant-based options with vegan vitamin D3
• If you’re concerned about quality, prioritize third-party tested products

Dosage and Timing

The body can only absorb about 500 mg of calcium at once. Therefore, if you need more than this amount, split your doses throughout the day. Additionally, most calcium supplements work best when taken with food, except calcium citrate which can be taken anytime.

Potential Side Effects and Precautions

While calcium supplements are generally safe for most people, there are some considerations to keep in mind:

• Constipation is a common side effect, particularly with calcium carbonate
• Some people experience gas or bloating
• High doses of calcium (over 2,500 mg daily) may increase the risk of kidney stones in susceptible individuals
• Calcium can interact with certain medications, including antibiotics, bisphosphonates, and some blood pressure medications

Always consult with your healthcare provider before starting any new supplement, especially if you have existing health conditions or take medications.

The Bottom Line on Calcium Supplements

Calcium supplements can be a valuable addition to your health regimen, particularly if you struggle to get enough calcium from food sources. The best supplement for you depends on your individual needs, digestive health, and other factors.

Our top choice, Thorne Basic Bone Nutrients, offers a well-rounded approach with calcium citrate plus supportive nutrients. However, any of the options on our list provides high-quality calcium backed by dietitian recommendations.

Remember that supplements should complement a healthy diet, not replace nutrient-rich foods. Calcium-rich foods like dairy products, leafy greens, and fortified plant milks should still form the foundation of your calcium intake.

When to Consult a Professional

Consider speaking with a registered dietitian or healthcare provider if you:

• Have a medical condition affecting bone health (like osteoporosis)
• Take medications that might interact with calcium
• Have digestive disorders that might affect nutrient absorption
• Are unsure about your calcium needs or the best form for your situation

They can provide personalized recommendations based on your specific health profile and needs.

Have you tried any calcium supplements that worked well for you? What factors do you consider most important when choosing a supplement? Share your experiences in the comments below!

References

• National Institutes of Health: Calcium Fact Sheet for Health Professionals
• National Osteoporosis Foundation: Calcium and Vitamin D
• Harvard T.H. Chan School of Public Health: Calcium
• Mayo Clinic: Calcium and Calcium Supplements
• Journal of the American College of Nutrition: Calcium Supplementation: Good for the Bones, Bad for the Heart?