A whole food calcium source, AlgaeCal® is made with sustainably sourced marine algae which contains 13 bone-building minerals in the right balance to strengthen bone, with the addition of a clinical dose of vitamin D3. This combination of nutrients is clinically supported to stop bone loss, and it is more gentle on the body than rock-based calcium supplements.

Minerals supplied include: Calcium; magnesium; boron; copper; manganese; silicon; nickel; selenium; phosphorus; potassium; vanadium; zinc and small amounts of strontium. The marine algae naturally digests these minerals directly from the ocean, in amounts similar to those found in the composition of our bones.

Why plant calcium?
Plant versus rock: Your current calcium supplement is probably either inorganic or laboratory-made. By far the most common form of calcium in supplements is carbonate, which is limestone – a rock. Your body was designed to accept plant minerals better than those of rock, because plants pre-digest the minerals for us.

AlgaeCal® is wild-harvested and derived from a South American marine red algae called Lithothamnion superpositum. This algae belongs to the Algas calcareas family of algaes.

Algas calcareas is unique because it mimics the mineral composition in human bones, both in quantity and variety.

The Algas calcareas naturally detach from seaweed and wash ashore, where the entire algae ball is then sustainably hand-harvested, sun dried, and milled into a powder, then cold processed to retain nutritional value. There is no extraction process, and no additives are used. It is simply pure, whole food.

Bio-available and ionic
The porous nature of AlgaeCal® increases surface area which lends itself to extensive ionisation. Dissolution tests, mimicking stomach acid, show 97 % goes into solution within 30 minutes!


  • Supports healthy bone mineral density.
  • Supports optimal calcium levels.
  • May assist in reducing risk of osteoporosis and osteopaenia.
  • May assist in reducing the risk of fractures.
  • Supports bone healing post-surgery or fractures.

Why is AlgaeCal® unique?

  • It is the only calcium complex proven to stop bone density loss.
  • USDA Certified Organic Calcium.
  • Pure plant calcium.
  • Unbleached algae calcium.
  •  The only algae calcium with human bone health studies.
  • Gluten-Free; Dairy-Free; Soy-Free; Non-GMO.

Clinical evidence to support the use of AlgaeCal®

1. A comparative effectiveness study of bone density changes in women over 40, following three bone health plans containing variations of the same novel plant-sourced calcium, namely AlgaeCal®

The women were monitored with DEXA scans over a year period. Post-menopausal women are expected to lose approximately 1% of bone density per year, with traditional calcium supplements only slowing that rate of loss slightly.

Results of this study however, were extraordinary, as they showed all groups had increased bone density at one year, with the smallest average increase among the 3 groups being 1,3%.
Int. J. Med. Sci. 2011, 8(3):180-191.

2. Comparative effects of AlgaeCal® vs. two common calcium salts on proliferation and mineralisation in human osteoblast cells

A study comparing effects of AlgaeCal® to those of calcium carbonate and calcium citrate on human osteoblast cells, showed Algae-Cal® having a 7x greater effect on mineralisation and proliferation of these bone building cells, and in addition, AlgaeCal® reduced oxidative stress on a cellular level.
Mol Cell Biochem. 2010 Jul;340(1-2):73-80 AlgaeCal safety and toxicological studies

Results from US and European studies show AlgaeCal® to have zero safety or toxicological concerns. Toxicity was also tested on pregnant and nursing females with excellent results.
Toxicol Mech Methods. 2010 Jul;20(6):334-44

AlgaeCal® is so much more than just a plant calcium supplement, it also contains high levels of natural magnesium, and over 70 trace minerals and phytonutrients.

AlgaeCal® delivers a full spectrum of minerals and plant nutrients working for you – Not just the usual one or two.


Pack Size: 90

Each vegetable capsule contains:  Calcium (from AlgaeCal®) 750 mg (75 % Daily Value); magnesium (from AlgaeCal®) 65 mg (20 % Daily Value); vitamin D3 (cholecalciferol) 1000 IU (25 mcg) (100% Daily Value)

Other ingredients: Vegetable capsule.


For bone health maintenance it is recommended to take 3 capsules daily. It is best to take 2 capsules in the morning with breakfast and 1 in the evening with dinner.

If you are actively trying to grow bone because you have been diagnosed with osteopenia, osteoporosis or you are at risk of developing osteoporosis then it is recommended to take 4 capsules daily. It is best to take 2 capsules in the morning with breakfast and 2 in the evening with dinner.

Caution: Generally, calcium supplements, including AlgaeCal® should be taken 3 hours apart from other medication and iron supplements. It is advised to take AlgaeCal® with meals to optimise absorption.


Store in the original packaging, with the lid tightly closed, at or below 25 °C. Keep out of reach of children.
This unregistered medicine has not been evaluated by the SAHPRA for its quality, safety and intended use.


Is AlgaeCal® vegan?

AlgaeCal® is vegetarian and not considered vegan. The source of the vitamin D3 in AlgaeCal® is from lanolin (wool wax). Although no animals are harmed during the process, it is considered an animal product.

Can I take AlgaeCal® if I have a shellfish allergy?
AlgaeCal® does not contain any shellfish – Only calcium, minerals from organic algae and added vitamins.

For any severe allergies it is always recommended to consult with your medical practitioner before using a product.

Is the iodine level a concern if I have a thyroid issue?
AlgaeCal® contains a tiny amount of iodine, only 1,23 mcg of iodine per daily serving. For reference, one large hard-boiled egg has 12 mcg of iodine and one medium-sized baked potato has 60 mcg.

As a precaution, please confirm any supplement or medication interaction with your medical practitioner before use.

Does AlgaeCal® cause side effects such as deposits in kidneys or arteries?

No. Unlike traditional, rock-derived calcium supplements, AlgaeCal® does not cause side effects such as kidney stones or arterial calcification.

AlgaeCal® is a natural, plant-sourced calcium that is easy for your body to absorb. It’s similar to the calcium you get from eating vegetables such as broccoli, kale and peas.