What Is the Best Vegan Calcium Supplement?
The best vegan calcium supplement for most people is PlantFusion Vegan Plant-Based Calcium: 3 tablets give 1,000 mg of calcium from red algae and 800 IU of vitamin D3 from lichen, for $0.92 a day. Want one on a testing list? NATURELO Bone Strength is the one algae calcium on NSF/ANSI 173 of the 15 algae calciums we checked. We checked 25 in all.
By Erin Rose Updated November 2026 How we score
1. Our pick: algae calcium with lichen vitamin D3
- Calcium
- 1,000 mg a dayFrom Aquamin red algae, in 3 tablets
- Vitamin D3
- 800 IU a dayFrom lichen
- Vegan
- On the bottleNot on a testing list
- Cost
- $0.92 a dayAt 3 tablets; $27.58 for 90, read Nov 9
Why we pick it PlantFusion gives calcium from red algae and vitamin D3 from lichen, the two things ChatGPT says to look for, and ChatGPT lists it first in 1 of its 3 saved answers to this question. It costs $0.55 per 600 mg of calcium, the lowest of the 8 algae calciums here. NATURELO is on NSF/ANSI 173 and costs $0.93 per 600 mg. DEVA costs $0.17 per 600 mg, the lowest of the 9 here, with calcium from minerals and vitamin D2.
Which one should you buy?
2. Future Kind Vegan Calcium: plain algae calcium in 2 capsules
Two capsules give 500 mg of calcium from red algae and 38 mg of magnesium, with no vitamin D, so you can pair it with any vegan vitamin D. ChatGPT names Future Kind in 2 of its 3 saved answers, more than any other brand.
Future Kind Vegan Calcium
$0.83 a day at 2 capsules · $24.99 for 60
3. NATURELO Bone Strength: the algae calcium on a testing list
It is on the NSF/ANSI 173 list as NATURELO Bone Strength. Four capsules give 600 mg of calcium from Aquamin algae, 1,000 IU of vitamin D3 from lichen, 200 mg of magnesium and 8 mg of zinc.
NATURELO Bone Strength
$0.93 a day at 4 capsules · $27.95 for 120
4. DEVA Vegan Cal-Mag Plus: registered with the Vegan Society, lowest cost per 600 mg here
Three tablets give 1,000 mg of calcium from four mineral forms, 800 IU of vitamin D2 and 400 mg of magnesium. The label says the product is registered with the Vegan Society.
DEVA Vegan Cal-Mag Plus
$0.29 a day at 3 tablets · $17.49 for two bottles of 90
Choose PlantFusion for 1,000 mg of algae calcium and lichen D3 a day, Future Kind for algae calcium with no added vitamin D, NATURELO for an algae calcium on a testing list, and DEVA for the lowest cost per 600 mg.
ChatGPT leads with algae calcium: PlantFusion, AlgaeCal Plus or Future Kind
In its 3 saved answers to this question, ChatGPT lists PlantFusion first once, AlgaeCal Plus first once and Future Kind first once. It names Future Kind in 2 of the 3, and PlantFusion, California Gold Nutrition, AlgaeCal, Garden of Life and DEVA in one each.
What it says to look for: calcium from red algae, vitamin D3 from lichen, and a testing mark where there is one.
Fifteen of 25 use calcium from algae; four are on a testing list
We checked 25 calcium supplements sold on Amazon as vegan or plant-based. Fifteen use calcium from algae, and 12 of those 15 say vegan on the label or Amazon listing; Garden of Life Vitamin Code Raw Calcium says vegetarian, and the two AlgaeCal products say plant-based. The other 10 use mineral calcium such as citrate, carbonate or malate.
Four of the 25 are on a third-party testing list, and NATURELO Bone Strength is the one algae calcium among them.
Here are the 9 with a buy button, our pick first, then the one on a testing list. The rest are not on a testing list and run from lowest cost a day.
| Supplement | A day | Cost a day | Buy |
|---|---|---|---|
| Our pick | |||
 PlantFusion Vegan Plant-Based CalciumOur pick90 tabletsVitamin D3 from lichen; adds vitamin K2 | 3 tablets: 1,000 mg calcium from algae, 800 IU vitamin D3 from lichen | $0.92$0.55 per 600 mg | See on Amazon |
| On a testing list (NSF/ANSI 173) | |||
| NATURELO Bone Strength120 capsulesVitamin D3 from lichen; adds magnesium and zinc | 4 capsules: 600 mg calcium from algae, 1,000 IU vitamin D3 from lichen | $0.93$0.93 per 600 mg | See on Amazon |
| Not on a testing list | |||
 NEUMINA Bone and Nerve90 tabletsOne tablet a day; adds L-theanine | 1 tablet: 210 mg calcium from algae, 800 IU vitamin D3 | $0.26$0.73 per 600 mg | See on Amazon |
| DEVA Vegan Cal-Mag PlusTwo bottles of 90 tabletsRegistered with the Vegan Society | 3 tablets: 1,000 mg calcium from minerals, 800 IU vitamin D2 | $0.29$0.17 per 600 mg | See on Amazon |
 NatureWise Algae-Calcium Plus120 capsulesAdds vitamin K2 and magnesium | 2 capsules: 360 mg calcium from algae, 800 IU vitamin D3 | $0.50$0.83 per 600 mg | See on Amazon |
| Future Kind Vegan Calcium60 capsulesCalcium and magnesium only | 2 capsules: 500 mg calcium from algae, no vitamin D | $0.83$1.00 per 600 mg | See on Amazon |
 Garden of Life Organics Plant Calcium90 tabletsVitamin D3 from algae; certified organic | 3 tablets: 1,000 mg calcium from algae, 1,000 IU vitamin D3 from algae | $0.98$0.59 per 600 mg | See on Amazon |
 Garden of Life Vitamin Code Raw Calcium120 capsulesLabel says vegetarian; D3 from a yeast culture | 4 capsules: 1,100 mg calcium from algae, 1,600 IU vitamin D3 from yeast | $1.31$0.71 per 600 mg | See on Amazon |
 AlgaeCal Plus120 capsulesLabel says plant-based | 4 capsules: 720 mg calcium from algae, 1,600 IU vitamin D3 | $2.83$2.36 per 600 mg | See on Amazon |
Vegans need the same 1,000 to 1,200 mg of calcium a day; count your food first
NIH says people who avoid dairy, vegans included, are more likely to fall short on calcium, because dairy foods are rich in it. Adults 19 to 50 and men 51 to 70 need 1,000 mg a day from food and supplements together; women 51 to 70 and everyone over 70 need 1,200 mg. Kale, broccoli and bok choy have calcium, and many plant milks, juices, tofu and cereals have it added. More in our calcium dosage guide.
Take one PlantFusion tablet with each meal: each gives about 333 mg, and NIH says absorption from supplements is highest at doses of 500 mg or less. NIH puts the adult upper limit for calcium at 2,000 to 2,500 mg a day, food and supplements together.
PlantFusion’s label: calcium from red algae and vitamin D3 from lichen
The PlantFusion Vegan Plant-Based Calcium label
Vitamin D for vegans: D3 from lichen or algae, or D2; 600 IU a day to age 70, 800 IU after
NIH says vitamin D helps the gut absorb calcium, that most vitamin D3 is made from lanolin from sheep’s wool, and that an animal-free D3 from lichen is also sold. Vitamin D2 is made from yeast, and NIH says both raise blood levels of vitamin D, though most evidence shows D3 raises them more and keeps them up longer. It sets the daily amount at 600 IU for ages 1 to 70 and 800 IU over 70.
Questions people ask
Is calcium from algae vegan?
Yes. Algae calcium comes from red seaweed that builds up calcium, not from an animal. Twelve of the 15 algae calciums we checked say vegan on the label or Amazon listing, PlantFusion among them.
Is vitamin D3 vegan?
It can be. PlantFusion and NATURELO print lichen as the source of their D3 on the label, and Garden of Life Organics prints algae. DEVA uses vitamin D2, which is made from yeast. More in D2 vs D3.
How many PlantFusion tablets should I take a day?
The label says 3 tablets a day, preferably with a meal. Count the calcium in your food first; one or two tablets may fill the rest.
How we picked
On November 9, 2026 we read the Amazon listing of each of the 25, where its calcium comes from and whether it says vegan, read the label photos of the 9 with a buy button, and searched five testing lists for each: NSF/ANSI 173, NSF Certified for Sport, Informed Choice, Informed Sport and USP Verified. Prices are Amazon’s, read November 9, 2026.
The other 16 we checked: Momentous Calcium (NSF/ANSI 173 and NSF Certified for Sport), Theralogix TheraCal D2000 and ReCalcia liquid calcium (both NSF/ANSI 173); New Chapter Bone Strength Take Care and Tiny Tabs; AlgaeCal Plant Based Calcium; NaturesPlus Source of Life Garden Calcium; Amazon Basics Calcium Plus Vitamin D2; Pure Nutrition Cal D; Supplements Studio Plant Based Calcium; Nutricost Coral Calcium; Solgar Calcium Magnesium plus Zinc; Pure Encapsulations Calcium Magnesium (Citrate); NOW Calcium Citrate; Country Life Cal-Snack; and Bluebonnet Albion Calcium Magnesium Chelate.
Sources
- Amazon listings and label photos of the 25 supplements, prices read November 9, 2026.
- Testing lists, read November 9, 2026: NSF/ANSI 173 list; NSF Certified for Sport; Informed Choice; Informed Sport; USP Verified.
- NIH Office of Dietary Supplements fact sheets for health professionals, read November 9, 2026: Calcium, Vitamin D.