10 Best Algae Calcium Supplement With D3 K2 of 2025

Tested and Reviewed: Top 10 Algae Calcium Supplement With D3 K2 deals with expert ratings from 8.1 to a perfect 10

May 2026 Edition

Editor's Choice

9.7

Garden of Life

Garden of Life Calcium Supplement with Magnesium & Organic Vitamin D3 K2, Made from Whole Foods, Gluten-Free, 90 Count

Editor's bottom line:

“This algae calcium supplement with d3 k2 is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

PLANT-BASED CALCIUM ROCKS: Our supplement offers 1,000mg of calcium from organic algae, serving as an alternative to rock-based formulas with added calcium magnesium benefits
CALCIUM MAGNESIUM: Contains 1,000 IU of Vegan D3 and 80 mcg of Vitamin K2
EASY TO DIGEST: The Garden of Life magnesium tablets use Clean Tablet Technology, making them highly bioavailable and easy to digest
NATURAL VITAMIN FORMULA: Made from over 20 real fruits and vegetables, this formula provides vitamin D with K2 sourced from whole foods, not synthetic origins
REAL TO THE ROOT - Garden of Life Vitamin D Supplement is made without synthetic binders or fillers and tested at every stepso you dont have to settle for less than Third-party Certified Organic, Non-GMO, Vegan, Gluten-Free and Kosher

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Picked by 397 people today

9.5

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

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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9.5

LILICARE

6-in-1 Plant Based Calcium Supplements for Women Men- Calcium 600mg w/ D3 K2 5000 IU Vitamin, Liposomal & Algae Ca-lcium Magnesium Zinc + Vegan Vitamin D 5000 IU + K2 MK7 + Methyl B12 for Bone, 1 Pack

Main Highlights

Liposomal Technology + Softgels: Our Vitamin D3 K2 Calcium supplement uses advanced liposomal technology to protect nutrients from stomach acid and digestive enzymes, delivering them directly into the bl--dstream for better absorption and less digestive discomfort. The sealed softgel structure protects the active ingredients, while its oily matrix enhances the absorption of fat-soluble vitamins D3 + K2. Softgels are easy to swallow, making them especially suitable for elderly individuals.
Better Source & Form: Our calcium is natural algae calcium, rich in 70+ trace minerals, with better solubility, gentler, and a structure closer to the calcium structure in human bones, which is easier to digest and absorb than calcium carbonate & calcium citrate. Magnesium citrate is an organic acid magnesium salt with high bioavailability & easy absorption. D3, K2, Zinc are both from plant sources. Vitamin B12 is methylated B12, which is the active form & can be directly absorbed & utilized.
5 Essential Nutrients for Bone Health: D3 promotes calcium absorption, while K2 activates osteocalcin to direct calcium to bones instead of soft tissues or artries. K2 ensures calcium is properly absorbed and delivered to bones. The combination of D3+K2+Calcium supports optimal calcium absorption & distribution, aiding bone calcification & density. Magnesium citrate assists in the metabolism of calcium & D3, balancing the ideal calcium-magnesium ratio (2:1). Zinc supports bone grwth & rpair.
5 Essential Nutrients for Her-t, Energy, M-d: Magnesium regulates hear-t rhythm, promotes energy production & improves m-d. Zinc supports protects the her-t. Vitamin D3 regulates m-d and supports her-t health. Vitamin K2 directs calcium to bones to reduce calcium buildup in artries, and works with D3 to support c-ardivscular health. Vitamin B12 supports energy production, nervous system and m-d health. These nutrients support optimal her-t, energy and m-d.
Pure & Highest Quality Ingredients: Non-GMO Vitamin D3 + K2 + Calcium + B12 Complex Supplement. Free of soy, wheat, dairy, gluten. Third-party lab tested and manufactured in a cGMP-compliant facility to ensure product safety, purity and effectiveness. In warm weather, it is normal for the softgels to stick together and clump. This does not affect the quality or efficacy of the product. To loosen clumps, shake the bottle vigorously or tap it on a table.

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9.2

Organics Ocean

Organics Ocean Better Calcium - Organic Red Algae Calcium with Vitamin D3 and K2 Supplements - Supports Bone Structure, Joint Comfort & Encourages Healthy Aging - Plant-Based, Non-GMO - 1 Pack

Main Highlights

Clinically Supported Calcium for Bones & Joints: Better Calcium delivers 500 mg of Organic Aquamin Red Algae Calcium, a sustainably sourced, plant-based calcium supplement derived from marine algae. This thoughtfully formulated blend combines vitamin D3 with K2 and calcium to support healthy calcium absorption and utilization, helping maintain bone strength and joint comfort as part of a daily wellness routine.
Iceland-Sourced Red Algae, Not Rocks: Our calcium is sustainably harvested from red marine algae in the pristine waters of Iceland. Unlike limestone or chalk calcium, Aquamin provides 70+ trace minerals that help support absorption and support joint mobility. This algae based calcium supplement delivers a gentle, food-based form your body recognizes, making it ideal for adults seeking a vegan option without heavy fillers or digestive discomfort.
Supports Mobility, Flexibility & Active Ageing: Better Calcium combines red algae calcium with organic Vitamin D3 and chickpea-derived K2 to help guide calcium to the bones while supporting mobility and flexibility. This clinically studied trio works together to promote daily movement, comfort, and long-term skeletal strength, making it an excellent calcium K2 D3 vitamin supplement for adults seeking optimal bone support.
Trusted, Research-Backed Ingredients: Our formula uses research-backed ingredients for their role in supporting bone and joint health. With Aquamin Calcium, VegD3, and MenaQ7 K2, Better Calcium is an organic red algae calcium supplement designed to support absorption using cleaner, thoughtfully sourced ingredients compared to many conventional D3 K2 calcium supplements.
No Fillers, No Compromise: Better Calcium is certified organic, vegan, non-GMO, and free from artificial additives or synthetic binders. Each bottle is third-party tested for purity and manufactured in a GMP-certified facility, giving you clean, safe, and reliable bone support.

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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.

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

PlantFusion

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

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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8.6

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

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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8.3

PURE NUTRITION NATURAL TREASURES

Pure Nutrition Cal D - Plant Based Calcium with VIT D3 K2 & Magnesium | 120 Tabs | 500mg Vegan Calcium per Serving | Algae Calcium Supplement for Bone Health

Main Highlights

Plant-Based Calcium Supplement with Vitamin D3, K2, and Magnesium | Vegan Algae-Sourced Calcium & Lichen-Sourced Vitamin D3 | Supports Overall Wellness*
Pure Nutrition Calcium Supplment includes 500mg of Algae Calcium (elemental), 35mg of Plant Based Magnesium, 24000 IU of Vegan D3 from lichen and 17 mcg of Vitamin K2 MK7 from Natto, 30 mg of Moringa Oleifera and 100mg Cissus Extract.
Plant based calcium supplement is made from easily digestible organic algae making them highly bioavailable and easy to digest. Vegan Plant basec Calcium Supplement for Women and Men.
Calcium with Vitamin D3 and K2: This supplement includes calcium, Vitamin D3, and K2 to support overall wellness and natural bodily functions.
Dosage - Take 2 Tabs Daily after a meal or as directed by your health care professional | Non GMO, Gluten Free, Dairy Free, Vegetarian |120 Tabs Pack

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8.1

ALGAECAL

ALGAECAL Bone Builder Pack - Plant Based Calcium Supplement & Strontium - Organic Calcium 750mg with Vitamin D3 1600 IU, Vitamin K2, Magnesium, 16 Nutrients for Bone Health & Density (1-Month Supply)

Main Highlights

Increase Bone Density: AlgaeCal Plus, a clinically supported plant-based calcium supplement for improved bone health. From organic algae with 16 bone-supporting nutrients. In addition to calcium, each serving includes magnesium, potassium, boron, manganese, vanadium, phosphorus, copper, zinc, nickel, strontium, silicon, and selenium with vitamins D3, K2-Mk7, & C.
Faster Results: Strontium slows down the cells that eat-away old bone, and speeds-up the cells that build healthy new bone. Which means when taken with AlgaeCal calcium supplement you get stronger bones in 6 months. Traditional calcium citrate supplements with D3 cant make this claim.
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.
Tested and Approved: The Bone Builder Pack is recommended by health experts to increase bone density safely and naturally. Take 2 AlgaeCal Plus capsules with breakfast or lunch, 2 with dinner, and 2 Strontium Boost capsules before bed, at least 2 hours apart from calcium. This clinically supported routine delivers 16 essential nutrients to promote stronger, healthier bones for life.
Manufactured in USA & Recyclable: Our Calcium and Strontium Boost 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 their bone strength in a way thats safe, natural, and clinically supported.

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8.1

LILICARE

Calcium 1200 mg with Vitamin D3 K2 5000 IU Softgels Supplement for Women Men - Liposomal Calcium Citrate & Algae Calcium Magnesium Zinc + D3 K2 B12, Plant-Based Vegan Vitamin D, Boron for Bone,120ct

Main Highlights

Dual Calcium Sources (Natural Plant-Based Algae Calcium and Calcium Citrate): Organic algal calcium is rich in over 70 trace minerals that aid in calcium absorption. It is more soluble, gentler, and its structure is closer to the calcium structure in human bones. Combined with the gentle and highly absorbable calcium citrate, it is easier to digest and absorb than calcium carbonate, making it suitable for people prone to constipation and those with insufficient stomach acid secretion.
High Bioavailability, 10 Times Higher Absorption Rate with Liposomal Technology: Our calcium 1200 mg with vitamin D3 K2 supplement utilizes advanced liposomal technology to protect nutrients from stomach acid and digestive enzymes, delivering them directly into the blodstream for better absorption and reduced digestive discomfort. The sealed softgel capsule structure protects the active ingredients, resulting in superior bioavailability and stability compared to other forms of calcium capsules.
9 essential nutrients for bone health: D3 promotes calcium absorption, while K2 activates osteocalcin, guiding calcium to the bones. K2 helps calcium be properly absorbed and delivered to the bones. The combination of D3 + K2 + calcium supports optimal calcium absorption and distribution, contributing to bone mineralization and density. Magnesium citrate assists in calcium and D3 metabolism, while manganese + copper + boron + silicon + zinc support the collagen matrix of bones and joints.
8 Essential Nutrients for Hert health, energy, and mod: Magnesium regulates hert rhythm, promotes energy production, and improves mod. Vitamin K2 directs calcium to the bones to reduce calcium buildup in the arteris and works synergistically with D3 + copper + zinc + manganese + boron to support cardivasculr health. Vitamin B12 and D3 supports energy production, the nervous system, and mod well-being. These nutrients support optimal hert health, energy levels, mod.
Pure and Premium Ingredients: Vegan Vitamin D3 + K2 + B12 + Calcium complex supplement suitable for women and men. Free of soy, wheat, dairy, and gluten. Manufactured in the USA in a cGMP-certified facility to ensure product safety, purity, and effectiveness. In warm weather, softgels may stick together and clump; this is normal and does not affect the quality or efficacy of the product. To separate clumps, shake the bottle vigorously or tap it against a hard surface.

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Our Best Overall Choice

Best Choice

9.7

Garden of Life

Garden of Life Calcium Supplement with Magnesium & Organic Vitamin D3 K2, Made from Whole Foods, Gluten-Free, 90 Count

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

PLANT-BASED CALCIUM ROCKS: Our supplement offers 1,000mg of calcium from organic algae, serving as an alternative to rock-based formulas with added calcium magnesium benefits
CALCIUM MAGNESIUM: Contains 1,000 IU of Vegan D3 and 80 mcg of Vitamin K2
EASY TO DIGEST: The Garden of Life magnesium tablets use Clean Tablet Technology, making them highly bioavailable and easy to digest
NATURAL VITAMIN FORMULA: Made from over 20 real fruits and vegetables, this formula provides vitamin D with K2 sourced from whole foods, not synthetic origins
REAL TO THE ROOT - Garden of Life Vitamin D Supplement is made without synthetic binders or fillers and tested at every stepso you dont have to settle for less than Third-party Certified Organic, Non-GMO, Vegan, Gluten-Free and Kosher

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