Each serving of AlgaeCal Plus provides 360 mg of elemental calcium in two capsules. That’s 720 mg per day when you take the full four-capsule daily dose.

This is the exact amount used in clinical studies that showed measurable increases in bone mineral density.

You don’t need more calcium, you need the right kind of calcium. Unlike ordinary rock-based calcium (from limestone or marble), AlgaeCal Plus delivers plant-based, whole-food calcium with 12 essential bone-building minerals + vitamins C,D,& K. These 16 nutrients are easy for your body to absorb and—most importantly—are clinically supported to increase bone density, something other calcium supplements simply can’t do.

It all comes down to source and absorption.

Rock-based calcium

Most conventional calcium supplements are made by grinding up rocks such as limestone or marble. Chemically, this produces calcium carbonate or calcium citrate—forms that are essentially purified stone. And because humans are not designed to digest rock, these supplements:

- Absorb poorly in the digestive tract, especially if stomach acid is low (which becomes more common with age).

- Provide only calcium and little else, leaving out the dozens of trace minerals your bones need to increase bone density

- Often require high daily doses (1,000–1,200 mg) to have even a modest effect—and even then, clinical studies show they merely slow bone loss rather than increase bone density.

Plant-based calcium

Plant calcium comes from living organisms—for example, the marine algae used in AlgaeCal (Mesophyllum superpositum). This algae absorbs a wide spectrum of ocean minerals as it grows, creating a natural mineral matrix similar to human bone.

Key advantages include:

- Better absorption: Your body recognizes plant minerals as food, allowing more efficient uptake even at lower doses (the 720 mg in AlgaeCal was the exact amount used in clinical trials that stopped bone loss).

- Complete mineral profile: Along with calcium, the algae naturally provides magnesium, boron, silica, zinc, and other trace minerals proven to support new bone formation.

- Clinical evidence: Human studies show plant-based AlgaeCal not only slows bone loss, but can stop bone loss—something no other calcium has ever demonstrated.

Bottom line

Rock-based calcium is literally ground stone. Hard to absorb and incomplete. Plant-based calcium is food for your bones: easier to digest, naturally balanced with essential co-factors, and clinically shown to help your bones grow stronger

No. AlgaeCal Plus is safe and without adverse side effects. Here’s why:

- Plant-based, not rock-based: Unlike traditional calcium supplements made from limestone or marble, AlgaeCal Plus is a food-source calcium similar to the calcium found in vegetables like broccoli and kale. So your body recognizes it as food and absorbs it accordingly.

- Balanced with co-factors: Each serving provides additional magnesium, boron, vitamin K2, and vitamin D3. These nutrients work together to move calcium into your bones where it belongs, and away from soft tissues like arteries, kidneys, or eyes.

- Clinically effective at a lower dose: AlgaeCal Plus increases bone density with only 720 mg of calcium per day, the exact amount used in human clinical studies. Traditional calcium supplements often recommend 1,200 mg or more—and still only slow bone loss.

Because AlgaeCal Plus delivers the right kind of calcium, in the right balance, it strengthens bones without the risks of kidney stones or arterial calcification.

AlgaeCal isn’t just another algae calcium. It’s the only one of its kind.

- Exclusive Source:

AlgaeCal has the worldwide exclusive rights to a rare red marine algae called Mesophyllum superpositum. No other supplement company can use this species. This unique algae naturally absorbs a complete spectrum of 13 bone-supporting minerals in ratios that closely match human bone.

- Clinically Supported:

AlgaeCal is the only calcium supplement—of any kind—that is supported by published human clinical studies showing actual increases in bone density.

Other algae-based calciums may provide plant calcium, but none have peer-reviewed research demonstrating measurable bone gains.

Because of this exclusive species and unmatched clinical evidence, AlgaeCal stands alone as the only algae-based calcium that is both unique in source and supported to strengthen bones.

Yes. All prescription bone medications require adequate calcium to give your body the raw materials it needs to build new bone. And AlgaeCal Plus provides a clinically supported, plant-based calcium that works beautifully alongside these treatments.

That said, it’s always important to check with your healthcare provider before making any changes to your supplement routine or medical care, especially if you’re currently taking prescription medications.

Yes. But timing matters. To avoid any potential interactions and to ensure the best absorption of both your supplements and medications, it’s best to take AlgaeCal Plus at least 2–3 hours apart from prescription drugs. Some medications may require a 3–4 hour separation, so always check with your doctor or pharmacist for your specific situation.

Special note for blood thinners:

If you are taking an older anticoagulant (such as warfarin or Coumadin), vitamin K2 is not recommended because these drugs use the same absorption pathway and can block each other. Newer anticoagulants—called Factor Xa inhibitors (e.g., apixaban, rivaroxaban) and Direct Thrombin inhibitors (e.g., dabigatran)—do not interfere with vitamin K2 and may be safer for your bones. Ask your doctor if one of these newer options is appropriate for you.

As always, consult your healthcare provider before adding any supplement or making changes to your medication routine.

Take AlgaeCal to STOP bone loss. Take AlgaeCal Plus to INCREASE bone density. Both products begin with the same foundation: plant-based calcium from our exclusive red marine algae (Mesophyllum superpositum), which naturally provides all 13 essential bone-supporting minerals. 

AlgaeCal is ideal for people who cannot take vitamin K2, such as those using older anticoagulant (blood-thinning) medications like warfarin or Coumadin, because it delivers the complete mineral matrix with vitamin D3 and without vitamin K2. 

AlgaeCal Plus contains everything in AlgaeCal but goes a step further by adding vitamin C for collagen formation and vitamin K2-7 (MK-7) to guide calcium safely into bones and away from soft tissues, while also providing slightly more vitamin D3, magnesium, and boron for even stronger bone support. 

Clinical studies show that AlgaeCal Plus produces the greatest improvements in bone density, so if you’re not on an older blood thinner—or if you’ve switched to a newer anticoagulant that doesn’t interact with K2—AlgaeCal Plus is the best choice for maximum bone-building benefits.