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Organic Plant Calcium

Garden of Life MyKind Organics
4.8
★ ★ ★ ★ ★
(5537 ratings)
Calcium 800 mg
Vitamin K 80 mcg
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Score70
The strongest feature is uses algae-derived calcium; the main drawback is large calcium amount per serving.
How scoring works
Quantity:180 Tablet(s) • (60 servings)
Goals:
Bone Health

Score 70

The strongest feature is uses algae-derived calcium; the main drawback is large calcium amount per serving.
How scoring works

Also available as

1 option
90 servings Calcium 800 mg, K 80 mcg • 90 Tablet(s) • 30 servings $29.39 ($0.97 per serving)
$50.39($0.83 per serving)
Pure Formulas
$ 50.39
Vitacost
$ 55.23
iHerb
$ 50.39
Vitacost
$ 50.39
iHerb
$ 50.39
Report prices

Analysis

Algae calcium, vitamin D, MK-7, and a small magnesium amount provide a focused plant-oriented bone formula. The core ingredients address related nutritional pathways rather than relying on a single mineral.

The 800 mg calcium serving may absorb less efficiently at once, magnesium is underdosed, and low-dose strontium and vanadium add little practical value. These issues matter for daily use, label interpretation, and comparison with simpler formulas.

The larger bottle suits adults committed to algae calcium who accept three tablets per serving and source more magnesium elsewhere. The most important trade-off is large calcium amount per serving.

Who is it for
  • The larger bottle suits adults committed to algae calcium who accept three tablets per serving and source more magnesium elsewhere
  • Adults comparing bone or general nutrient formulas by dose and form
Best for
  • Longer supply of plant-oriented calcium
  • Calcium with vitamin D and MK-7

Pros

  • Uses algae-derived calcium
  • Includes vitamin D3 and MK-7
  • Sixty-serving bottle
  • Provides some magnesium

Cons

  • Large calcium amount per serving
  • Magnesium amount is low
  • Minor extras add little value
  • Three tablets per serving

Warnings

  • Vitamin K2 can interfere with warfarin dosing and should remain consistent under prescriber guidance.
  • Calcium at 800 mg in one serving may cause constipation and may be better divided when appropriate.

Nutrient quality

77 High impact

Meaningful calcium, vitamin D, and MK-7 support the bone-focused purpose. Light magnesium and an opaque plant blend reduce precision and depth.

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Ingredient transparency

65 High impact

Core active amounts are mostly clear and easy to evaluate. Missing non-active ingredients and complete use directions leave meaningful label gaps.

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Customer satisfaction

74 High impact

Aggregate satisfaction data are favorable and supported by substantial volume. Specific firsthand comments were not supplied, leaving repeated complaints and purpose fit uncertain.

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Value for money

67 High impact

The core actives provide fair value for the category. Serving economics and formulation trade-offs keep it from standing out.

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Report analysis

Goals

Bone Health
Bone Health
Impact
Highest effect
A Goal FitA- Strength of SupportB+ CoverageA Formula Quality
Vitamin K · 80 mcgMagnesium · 60 mgCalcium · 800 mgVitamin D · 25 mcg

Algae-sourced calcium, vitamin D, MK-7, and magnesium form a broad bone-focused system. Calcium supplies structural material, while vitamin D and K2 support absorption and mineral placement.

The calcium amount exceeds the preferred single-dose range, so dividing the tablets may improve use. Magnesium is modest, and the small strontium and vanadium amounts add little demonstrated depth.

Study evidence
Calcium Supportive 144 studies
Magnesium Supportive 48 studies
Strontium Not classified

No linked studies yet.

Vitamin D Supportive 202 studies
Vitamin K Supportive 78 studies

Ingredients

IngredientAmount per serving
Vitamin D (D2, D3)
 25 mcg
Calcium (organic Algae)
 800 mg
Magnesium (organic Algae)
 60 mg
Vitamin K2 (Menaquinone-7)
 80 mcg
Strontium (Algae)
 4 mg
Vanadium (Algae)
 8 mcg
Organic Plant Calcium Blend
3.3 Gram(s)
Gluten Free Adults 18–50 Vegan Kosher Dairy Free Organic Vegetarian
Report overview
Vitamin K (Menaquinone-7) · 80 mcg OverallScore70
C+ Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyD+ Value

Generic MK-7 provides a well-absorbed vitamin K2 form, but the 80 mcg amount is limited to maintenance support. Dry delivery lacks a disclosed fat-based absorption aid or meal instruction. Calcium and vitamin D broaden the bone-focused formula, but serving cost is high for a maintenance MK-7 amount.

View ingredientView products
Calcium (organic Algae) · 800 mg OverallScore70
A+ Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyF Value

Organic algae provides a premium calcium source with a clearly disclosed 800 mg amount. The full serving is larger than the preferred single-dose range, which may reduce the share absorbed at once. Added vitamin D and MK-7 support the bone-focused formula, although the serving cost remains high.

View ingredientView products
Loading alternative details
89 Performance

Mega D-3 5000 IU & MK-7 180 mcg

NOW
<p>It combines 125 mcg of vitamin D3 with 180 mcg of K2. The ingredient form or amount gives stronger focused coverage of calcium or the vitamin D-and-K pairing than the original. Because it covers only part of the original formula, another product may be needed for the omitted bone-support nutrients.</p>
83 Performance

Albion Chelated Calcium 180 mg

Swanson Ultra
<p>It supplies 360 mg of calcium as a glycinate chelate plus 2.5 mcg of vitamin D. The ingredient form or amount gives stronger focused coverage of calcium or the vitamin D-and-K pairing than the original. Because it covers only part of the original formula, another product may be needed for the omitted bone-support nutrients.</p>
87 Performance

Vitamin D3 25 mcg (1000 IU) & K2 120 mcg

Natural Factors
<p>It combines 25 mcg of vitamin D3 with 120 mcg of K2 as menaquinone-7. The ingredient form or amount gives stronger focused coverage of calcium or the vitamin D-and-K pairing than the original. Because it covers only part of the original formula, another product may be needed for the omitted bone-support nutrients.</p>
84 Budget

600 Calcium Supplement

21st Century
<p>It supplies 600 mg of calcium carbonate. It is much less expensive per serving and directly covers either calcium or K2. It is not a complete replacement for the original’s combined calcium, vitamin D, vitamin K, and other supporting ingredients.</p>
84 Budget

Calcium 600 with Vitamin D3

Nature's Bounty
<p>It combines 600 mg of calcium carbonate with 20 mcg of vitamin D3. It is much less expensive per serving and directly covers either calcium or K2. It is not a complete replacement for the original’s combined calcium, vitamin D, vitamin K, and other supporting ingredients.</p>
88 Budget

Vitamin K2 MK-7 100 mcg

Nutricost
<p>It supplies 100 mcg of vitamin K2 as menaquinone-7. It is much less expensive per serving and directly covers either calcium or K2. It is not a complete replacement for the original’s combined calcium, vitamin D, vitamin K, and other supporting ingredients.</p>
84 Value

Calcium Citrate +D3 Petites

21st Century
<p>It combines 400 mg of calcium citrate with 12.5 mcg of vitamin D3. It offers concentrated calcium or K2 coverage at a much lower ongoing cost. Compared with the original, the value is focused on one main collection rather than a complete multi-ingredient bone formula.</p>
86 Value

Natural Vitamin K2 MK-7 with MenaQ7 100 mcg

Doctor's Best
<p>It supplies 100 mcg of vitamin K2 as MenaQ7 menaquinone. It offers concentrated calcium or K2 coverage at a much lower ongoing cost. Compared with the original, the value is focused on one main collection rather than a complete multi-ingredient bone formula.</p>
82 Value

Calcium Citrate

Nature's Way
<p>It supplies 500 mg of calcium from carbonate, citrate, and malate. It offers concentrated calcium or K2 coverage at a much lower ongoing cost. Compared with the original, the value is focused on one main collection rather than a complete multi-ingredient bone formula.</p>
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Three-year low-dose menaquinone-7 supplementation helps decrease bone loss in healthy postmenopausal women.
    Knapen MH; Drummen NE; Smit E; Vermeer C; Theuwissen E · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Randomized trial244 participantsBone Health forVitamin K
  2. Does vitamin K2 play a role in the prevention and treatment of osteoporosis for postmenopausal women: a meta-analysis of randomized controlled trials.
    Huang ZB; Wan SL; Lu YJ; Ning L; Liu C; Fan SW · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2015
    Meta-analysis6,759 participants19 studies pooledBone Health forVitamin K
  3. Investigating the interrelationship of vitamin K and vitamin D status on bone density: results from the VITamin D and OmegA-3 TriaL.
    Chou SH; Booth SL; Cook NR; Kim E; Kotler G; Fu X; Buring JE; Manson JE; LeBoff MS · JBMR plus · 2026
    Randomized trial771 participantsBone Health forVitamin K
  4. Associations of dietary calcium intake with metabolic syndrome and bone mineral density among the Korean population: KNHANES 2008-2011.
    Kim MK; Chon SJ; Noe EB; Roh YH; Yun BH; Cho S; Choi YS; Lee BS; Seo SK · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2018
    Cross-sectional study14,705 participantsBone Health forCalcium
  5. Calcium supplementation during pregnancy and maternal and offspring bone health: a systematic review and meta-analysis.
    Tihtonen K; Korhonen P; Isojärvi J; Ojala R; Ashorn U; Ashorn P; Tammela O · Annals of the New York Academy of Sciences · 2022
    Meta-analysis1,566 participants7 studies pooledBone Health forCalcium
  6. Bone turnover and the response to alendronate treatment in postmenopausal osteoporosis.
    Gonnelli S; Cepollaro C; Pondrelli C; Martini S; Montagnani A; Monaco R; Gennari C · Calcified tissue international · 1999
    Randomized trial100 participantsBone Health forCalcium
  7. What is the impact of daily oral supplementation of vitamin D3 (cholecalciferol) plus calcium on the incidence of hip fracture in older people? A systematic review and meta-analysis.
    Manoj P; Derwin R; George S · International journal of older people nursing · 2023
    Meta-analysis12,620 participants7 studies pooledBone Health forCalcium
  8. Calcium supplementation prevents seasonal bone loss and changes in biochemical markers of bone turnover in elderly New England women: a randomized placebo-controlled trial.
    Storm D; Eslin R; Porter ES; Musgrave K; Vereault D; Patton C; Kessenich C; Mohan S; Chen T; Holick MF; Rosen CJ · The Journal of clinical endocrinology and metabolism · 1998
    Randomized trial60 participantsBone Health forCalcium
  9. The effects of calcium supplementation (milk powder or tablets) and exercise on bone density in postmenopausal women.
    Prince R; Devine A; Dick I; Criddle A; Kerr D; Kent N; Price R; Randell A · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 1995
    Randomized trial168 participantsBone Health forCalcium
  10. The efficacy of calcium supplementation alone in elderly Thai women over a 2-year period: a randomized controlled trial.
    Rajatanavin R; Chailurkit L; Saetung S; Thakkinstian A; Nimitphong H · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Randomized trial404 participantsBone Health forCalcium
  11. Calcium-enriched foods and bone mass growth in prepubertal girls: a randomized, double-blind, placebo-controlled trial.
    Bonjour JP; Carrie AL; Ferrari S; Clavien H; Slosman D; Theintz G; Rizzoli R · The Journal of clinical investigation · 1997
    Randomized trial149 participantsBone Health forCalcium
  12. Association between Serum Magnesium and Fractures: A Systematic Review and Meta-Analysis of Observational Studies.
    Dominguez LJ; Veronese N; Ciriminna S; Pérez-Albela JL; Vásquez-López VF; Rodas-Regalado S; Di Bella G; Parisi A; Tagliaferri F; Barbagallo M · Nutrients · 2023
    Meta-analysis119,755 participants4 studies pooledBone Health forMagnesium
  13. Bioabsorbable Magnesium-Based Materials Potential and Safety in Bone Surgery: A Systematic Review.
    Hung CH; Kwok YC; Yip J; Wong HH; Leung YY · Craniomaxillofacial trauma & reconstruction · 2025
    Systematic review386 participants8 studies pooledBone Health forMagnesium
  14. Vascularized bone grafting fixed by biodegradable magnesium screw for treating osteonecrosis of the femoral head.
    Zhao D; Huang S; Lu F; Wang B; Yang L; Qin L; Yang K; Li Y; Li W; Wang W; Tian S; Zhang X; Gao W; Wang Z; Zhang Y; Xie X; Wang J; Li J · Biomaterials · 2016
    Randomized trial48 participantsBone Health forMagnesium
  15. An update on magnesium and bone health.
    Rondanelli M; Faliva MA; Tartara A; Gasparri C; Perna S; Infantino V; Riva A; Petrangolini G; Peroni G · Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine · 2022
    Narrative reviewBone Health forMagnesium
  16. Sex-specific differences in the association of magnesium intake with femoral neck bone mineral density among older adults.
    Wang B; Tan X; Yao X; Zhu Z · Endocrine connections · 2025
    Cross-sectional study1,343 participantsBone Health forMagnesium
  17. Pregnancy vitamin D supplementation and offspring bone mineral density in childhood follow-up of a randomized controlled trial.
    Moon RJ; D' Angelo S; Curtis EM; Ward KA; Crozier SR; Schoenmakers I; Javaid MK; Bishop NJ; Godfrey KM; Cooper C; Harvey NC; MAVIDOS Trial Group · The American journal of clinical nutrition · 2024
    Randomized trial454 participantsBone Health forVitamin D
  18. Vitamin D analogs and bone: preclinical and clinical studies with eldecalcitol.
    Matsumoto T; Takano T; Saito H; Takahashi F · BoneKEy reports · 2014
    Narrative reviewBone Health forVitamin D
  19. Efficacy of vitamin D fortified foods on bone mineral density and serum bone biomarkers: A systematic review and meta-analysis of interventional studies.
    Tangestani H; Djafarian K; Emamat H; Arabzadegan N; Shab-Bidar S · Critical reviews in food science and nutrition · 2020
    Meta-analysis1,786 participants20 studies pooledBone Health forVitamin D
  20. Cholecalciferol Supplementation Attenuates Bone Loss in Incident Kidney Transplant Recipients: A Prespecified Secondary Endpoint Analysis of a Randomized Controlled Trial.
    Tsujita M; Doi Y; Obi Y; Hamano T; Tomosugi T; Futamura K; Okada M; Hiramitsu T; Goto N; Isaka Y; Takeda A; Narumi S; Watarai Y · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2022
    Randomized trial193 participantsBone Health forVitamin D
  21. Vitamin D supplementation and bone health in post-menopausal women: a 24-month randomized controlled intervention with enhanced bioavailability formulations.
    Rasool N; Munir Y · European journal of clinical nutrition · 2026
    Randomized trial612 participantsBone Health forVitamin D
  22. Vitamin K and the prevention of fractures: systematic review and meta-analysis of randomized controlled trials.
    Cockayne S; Adamson J; Lanham-New S; Shearer MJ; Gilbody S; Torgerson DJ · Archives of internal medicine · 2006
    Meta-analysis13 studies pooledBone Health forVitamin K
  23. Effect of combined administration of vitamin D3 and vitamin K2 on bone mineral density of the lumbar spine in postmenopausal women with osteoporosis.
    Iwamoto J; Takeda T; Ichimura S · Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association · 2001
    Randomized trial92 participantsBone Health forVitamin K
  24. Efficacy and safety of vitamin K2 for postmenopausal women with osteoporosis at a long-term follow-up: meta-analysis and systematic review.
    Zhou M; Han S; Zhang W; Wu D · Journal of bone and mineral metabolism · 2022
    Meta-analysis6,853 participants9 studies pooledBone Health forVitamin K
  25. Low-dose vitamin K2 (MK-4) supplementation for 12 months improves bone metabolism and prevents forearm bone loss in postmenopausal Japanese women.
    Koitaya N; Sekiguchi M; Tousen Y; Nishide Y; Morita A; Yamauchi J; Gando Y; Miyachi M; Aoki M; Komatsu M; Watanabe F; Morishita K; Ishimi Y · Journal of bone and mineral metabolism · 2015
    Randomized trial48 participantsBone Health forVitamin K