10 Best Algae Based Calcium Supplements of 2025

Tested and Reviewed: Top 10 Algae Based Calcium Supplements deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

NATURELO

NATURELO Calcium Supplement - with Vitamin C, Vitamin D3, K2, and Calcium Magnesium Zinc for Bone Strength with Calcium 600mg - Plant-Based, 120 Vegetarian Capsules, Non-GMO, Soy & Gluten-Free

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Editor's bottom line:

“This algae based calcium supplements is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

CALCIUM MAGNESIUM ZINC D3 SUPPLEMENT: NATURELO Bone Strength is a calcium, magnesium and zinc supplement enriched with plant-based nutrients to support bone health*, including Calcium sourced from marine algae and Vitamin D3 from lichen.
VITAMIN ENRICHED CALCIUM MAGNESIUM SUPPLEMENT: Offering a comprehensive bone health nutritional formula - this calcium and magnesium supplement contains essential vitamins such as Vitamin D3, K2, and C, plus Zinc and other minerals to support bone density* and maintain bone health.*
ABSORPTION: This Magnesium Zinc Calcium Supplement is designed to support calcium absorption in the body, with the inclusion of Vitamin D3, Magnesium, and Vitamin K2, to help effectively directing calcium towards the bones.
CALCIUM 600 MG WITH VITAMIN D3: Our calcium 600 mg with Vitamin D3 supplement helps support bone health* especially important in later life stages, and in women who tend to lose more bone mass during perimenopause and menopause.
CLEAN AND NATURAL: As a clean-label, non-GMO calcium and Vitamin D supplement, these special vitamins for bone strength have no unnecessary additives. Free from gluten, dairy, nuts, preservatives and artificial coloring, this magnesium, calcium, zinc supplement is suitable for vegans and vegetarians.

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Picked by 397 people today

9.5

PlantFusion

PlantFusion Vegan Calcium, Premium Plant Based Calcium (1000mg) Sourced from Icelandic Red Algae, Plus Magnesium, D3, K2, and Boron, 90 Vegan Tablets

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Main Highlights

PLANT BASED CALCIUM MAGNESIUM: We start with a scientifically validated and trademarked source of calcium/magnesium concentrated to 1000mg per serving. We then add plant based vitamins D3 and K2 for calcium assimilation and critical trace minerals like strontium and boron which help form the bone matrix. Altogether more than a dozen different supplements in one. We call this the ultimate Fusion for bone health!
SOURCE MATTERS MOST: This ultra-premium plant based calcium and magnesium supplement is made from a unique trademarked ingredient called Aquamin. Aquamin is a nutrient dense form of algae grown in the pristine nutrient rich waters off Iceland. Calcium and magnesium from Icelandic red algae is a higher quality source of these minerals that is more absorbable in your body. This allows you to take a smaller dose than you might with synthetic forms of calcium for easy digestion.
D3, K2, BORON & STRONTIUM: Bone growth is a complex process that requires many different nutrients. Thats why our formula contains over 12 different supplements in one. These include plant based vitamin D3 & vitamin K2, plus the minerals boron and strontium which all play a role in creating the bonds that form our bone matrix for optimal bone density and strength.
CLEAN BONE SUPPORT FORMULA: We only use minerals that are tested for heavy metals, vegan certified, non-GMO verified, dairy free, gluten free, soy free and that contain no artificial ingredients or chemicals.
THE PLANT BASED EXPERTS: PlantFusion was one of the pioneers of plant based supplements over a decade ago. All products are produced under cGMPs (current Good Manufacturing Practices) and adhering to US FDA guidelines. All ingredients and finished goods are subjected to rigorous 3RD party analytical testing.

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9.5

ALGAECAL

ALGAECAL- Plant Based Calcium Supplement with Vitamin D3 (1000 IU) for Bone Strength, Contains 13 Minerals Supporting Bone Health, Organic Calcium (750 mg) for Women & Men, 90 Veggie Caps, Made in USA

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Main Highlights

Promote healthy bones: AlgaeCal, a clinically supported plant-based calcium supplement for bone health. Sourced from organic algae with 13 bone-supporting minerals. In addition to calcium, each serving includes magnesium, potassium, boron, manganese, vanadium, phosphorus, copper, zinc, nickel, strontium, silicon, and selenium with vitamin D3.
Red Algae Organic Calcium: traditional calcium citrate supplements are sourced from quarries. But AlgaeCal is different. Its a plant-based calcium that naturally contains all 13 of the minerals clinically supported - like magnesium and vitamin D - to support bone health. And because its plant-based, its gentle on the body.
Tested and approved: AlgaeCal is recommended by bone health experts to reduce the risk of osteopenia fractures. Boost bone strength with the 13 minerals essential for healthy bone density. AlgaeCal is the ideal plant based calcium, with magnesium, zinc, and vitamin D for women and men with low bone density.
Natural & Sustainable: AlgaeCal is a calcium supplement for women and men thats sourced from organic ocean algae. Hand-harvested from a beach in South America, these organic algae are a new chapter in bone health! They naturally contain all the minerals for healthy bones.
Manufactured in USA & Recyclable: AlgaeCal is manufactured in the USA. Our calcium capsules are veggie-based. Easy to swallow. Dairy free. Soy free. Gluten free. Non-GMO. And our packaging is recyclable. Suitable for women and men who want to increase bone strength in a way thats safe, natural, and clinically supported.

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9.2

NOW Foods

NOW Foods Supplements, Red Mineral Algae Plus Vitamin D-2, Joint Health*, 180 Veg Capsules

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Main Highlights

JOINT HEALTH*/TRADEMARKED INGREDIENT: Aquamin is a bioavailable, multi-mineral complex from marine red algae and an excellent source of calcium, a good source of magnesium, and has more than 70 additional trace minerals
VEGETARIAN CALCIUM PLUS VEGETARIAN VITAMIN D-2: A vegetarian-friendly vitamin D-2 is added to this formula to further support bone health*
CERTIFICATIONS/CLASSIFICATIONS: Soy Free, Non-GMO, Vegan/Vegetarian, Nut Free, Made without Gluten, Dairy Free, Egg Free, Kosher
GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
Packaged in the USA by a family owned and operated company since 1968

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9.0

sapling

sapling Calcium Supplement - Whole Food with Vitamin K2 & D3, Magnesium, Zinc, Boron, Mineral Complex. Sourced Sustainably from Red Algae. for Bone Strength and Support. Non-GMO & Vegan 90 Capsules.

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Main Highlights

All-In-One Formula - Our Vegan Calcium is packed with 600mg of Elemental Calcium from sustainably sourced Red Algae. Contains Vitamin K2 and D3, Zinc, Manganese, and Boron.
Vegan and Non-GMO - Sapling Algae Calcium is Vegan, Non-GMO, Gluten Free, No Colorants, and no Artificial Flavoring. Additionally, it is bottled and manufactured in the United States.
One Bottle, One Tree We take the environment seriously. Thats why for each bottle we sell, one tree is planted.

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8.8

ALGAECAL

ALGAECAL Organic Red Algae Calcium Supplement for Bone Density, Vitamin K2 MK7 (100mg), Vitamin D3 (1600 IU), Magnesium (350mg) & Trace Minerals & Strength, Easy to Swallow, 120 Veggie Caps

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Main Highlights

Increase Bone Density: AlgaeCal Plus, a clinically supported plant-based calcium supplement for improved bone health. From organic algae with 13 bone-supporting minerals. In addition to calcium (720mg), each serving includes magnesium, potassium, boron, manganese, vanadium, phosphorus, copper, zinc, nickel, strontium, silicon, and selenium with vitamins D3, K2-Mk7, & C.
Plant Based: traditional calcium citrate supplements are sourced from quarries. But AlgaeCal is a plant-based calcium that naturally contains all 16 of the clinically supported nutrients - like magnesium and vitamin D - to support bone health and support fracture healing. And because its plant-based, its gentle on the body.
Tested and approved: AlgaeCal is recommended by bone health experts to reduce the risk of fractures due to bone loss. Promotes bone strength with 16 nutrients essential for healthy bone density. AlgaeCal is the ideal plant based calcium for women and men with low bone density.
Complete formula: AlgaeCal Plus contains 16 nutrients for bone health. 13 bone-building minerals plus vitamin D3 for calcium absorption. Vitamin K2-Mk7 to direct calcium to your bones, and vitamin C to fight the root cause of bone loss. Together, these 16 nutrients are clinically supported to increase bone density and represent a new chapter in bone strength.
Manufactured in USA & Recyclable: AlgaeCal Plus is manufactured in the USA. Our calcium capsules are veggie-based. Easy to swallow. Dairy free. Soy free. Gluten free. Non-GMO. And our packaging is recyclable. Suitable for women and men who want to increase bone strength in a way thats safe, natural, and clinically supported.

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8.6

New Chapter

New Chapter Calcium Supplement - Bone Strength Plant-Based USDA Organic Calcium with Magnesium, Vitamin D3+K2, for Bone Health & Joint Mobility, Heart Support, 905 mg dose - 120 Slim Tablets

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Main Highlights

SUPPORT BONE DENSITY: Clinical-strength dose of calcium with vitamins K2 & D3 supports bone density and normal bone creation, strong teeth, healthy joint support and mobility, and heart health for men and women*
ORGANIC & PLANT-BASED: USDA Organic plant-based calcium from wild Red Marine Algae from Iceland is backed by 27 studies and includes magnesium and 70+ naturally occurring trace minerals*
BETTER ABSORPTION: Vitamin D3 boosts calcium absorption, while K2 guides it directly to your bonesinstead of arteriesfor optimal results. No limestone. An alternative to calcium citrate.
EASY TO SWALLOW: Slim calcium tablets for bone support with slow & steady release
USDA Organic, Non-GMO Project Verified, 100% Vegan, Certified Kosher, Certified Gluten Free by NSF, Harvested from Iceland. Now in stronger boxes. Soft to touch, superb quality.

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8.3

Holly Hill Health Foods

Holly Hill Health Foods Algae Based Calcium 1,000 mg, 180 Tablets

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Main Highlights

Aquamin mineralized red algae is collected in the pristine Arctic waters of Iceland.
Aquamin helps to mineralize bone cells, and supports bone density and strength.
It is rich in calcium, magnesium and 72 trace minerals. Bone mineralization is also enhanced when taken with Vitamins D-3 and K-2.
Organic, Vegan and Vegetarian. Contains No: sugar, salt, dairy, wheat, gluten, yeast, corn, preservatives, artificial colors or flavors. Quality And Potency Guaranteed.

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8.1

Igennus Healthcare Nutrition

Igennus Algae Calcium & Magnesium Supplement, Plant Based, High Absorption, K2 & D3, Vegan, Non-GMO Red Algae Mineral Complex for Bone & Teeth Support, for Women and Men, with Boron, 60 Tablets

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Main Highlights

2:1 ALGAE CALCIUM MAGNESIUM SUPPLEMENT: Igennus nutrition scientists carefully formulated a 2:1 calcium-to-magnesium ratio at meaningful doses, essential for long-term musculoskeletal health. Split dosing boosts absorption*
BORON D3 & K2 FOR ENHANCED CO-FACTOR SUPPORT: boron reduces calcium & magnesium excretion; vitamin D3 supports bone-building activity; vitamin K2 all-trans MK7 transports calcium to bone, preventing artery build-up. With trace minerals*
SUPER ABSORBABLE PLANT-BASED NUTRIENT FORMS: raw algae calcium is 45% more soluble than calcium carbonate from rock. Magnesium from mineral-rich seawater offers superior absorption. Active D3 form. All-trans K2 MK-7. Optimal 3mg boron dose*
COMPLETE MUSCULOSKELETAL FORMULA: Calcium & vitamin D support bone growth, development & strength. Calcium & magnesium support muscle function. Calcium, magnesium & vitamin D help to maintain healthy teeth. Ideal for adults & kids aged 12+*
CERTIFIED VEGAN: UK GMP Manufactured. Hypoallergenic; free from gluten, wheat, dairy, lactose, soya, artificial colors & flavors. Compatible with halal & kosher diets

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8.1

Peak Performance

Plant Based Calcium - Red Marine Algae Calcium Supplement with Vitamin C, D3, K, Magnesium, and Whole Food Vegetable Blend. Vegan Capsules for Bones and Joints. 120 Pills, Tablets

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Main Highlights

Dont Be Fooled By Cheap Calcium Capsules - Not all calcium is the same! Most calcium supplements use synthetic, formulas and fillers. At Peak Performance our calcium is derived from ecologically grown Wild Red Marine Algae (Lithothamnion) in the United Kingdom. This gives a rich calcium resource necessary for optimal bones, joints, heart and muscles.*
What's In Your Supplement? - Our Vegan Calcium Rich Plant Based Algae is harvested from its marine habitat. No limestone, or animal bone. Just pure, plant ingredients!
Micro Nutrients For Potency & Maximum Absorption - Also includes: Vitamin C, Vitamin D3, Vitamin K and Magnesium.
Vegan Formulated - Manufactured without Gluten, GMOs, Additives, Preservatives, Artificial Colors, Soy, and Dairy. Made Under The Highest Quality GMP Regulations and USA Standards.
1-For-1 Donation Match Program! Through our 1-for-1 partnership with the nonprofit Vitamin Angels, every purchase provides a child at risk of malnutrition with vitamins for a full year. To date we have helped over 3 million children through this partnership, so thank you for supporting this mission.

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Our Best Overall Choice

Best Choice

9.7

NATURELO

NATURELO Calcium Supplement - with Vitamin C, Vitamin D3, K2, and Calcium Magnesium Zinc for Bone Strength with Calcium 600mg - Plant-Based, 120 Vegetarian Capsules, Non-GMO, Soy & Gluten-Free

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Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

CALCIUM MAGNESIUM ZINC D3 SUPPLEMENT: NATURELO Bone Strength is a calcium, magnesium and zinc supplement enriched with plant-based nutrients to support bone health*, including Calcium sourced from marine algae and Vitamin D3 from lichen.
VITAMIN ENRICHED CALCIUM MAGNESIUM SUPPLEMENT: Offering a comprehensive bone health nutritional formula - this calcium and magnesium supplement contains essential vitamins such as Vitamin D3, K2, and C, plus Zinc and other minerals to support bone density* and maintain bone health.*
ABSORPTION: This Magnesium Zinc Calcium Supplement is designed to support calcium absorption in the body, with the inclusion of Vitamin D3, Magnesium, and Vitamin K2, to help effectively directing calcium towards the bones.
CALCIUM 600 MG WITH VITAMIN D3: Our calcium 600 mg with Vitamin D3 supplement helps support bone health* especially important in later life stages, and in women who tend to lose more bone mass during perimenopause and menopause.
CLEAN AND NATURAL: As a clean-label, non-GMO calcium and Vitamin D supplement, these special vitamins for bone strength have no unnecessary additives. Free from gluten, dairy, nuts, preservatives and artificial coloring, this magnesium, calcium, zinc supplement is suitable for vegans and vegetarians.

Show Price

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