The Safe, Plant-Based Calcium With No Adverse Side Effects
AlgaeCal is the only calcium backed by clinical studies to increase bone density.‡* And because it’s plant-based, your body absorbs it easily—without the usual digestive issues.
So, you’ve just been told your bone density is dangerously low. Now, you’ve got a million thoughts racing through your head. But the one that keeps coming back? How do I fix this? You talked to your doctor, but let’s be honest—the treatments they suggested just don’t sit right with you.
In fact, those “solutions” your doctor mentioned? They sound almost worse than the problem, don’t they?
That’s why you’re looking for something natural—and that’s exactly why AlgaeCal caught your eye.
You love that it’s backed by real human clinical studies. You love that, over the last 22 years, it’s helped millions of women safely rebuild their bone density. And let’s be honest—what you really love is our Bone Builder Pack, with results guaranteed. If your bone density doesn’t improve in 6 months? You get every penny back. No questions asked.
But there’s still one thing you’re wondering…
Does AlgaeCal Have Any Adverse Side Effects?
No, it doesn’t. And that’s not just a claim—it’s backed by published clinical research.
Take one study in the Nutrition Journal. 216 volunteers followed the AlgaeCal Plus regimen for six months. And guess what? After six months, not a single person reported any adverse side effects. And they didn’t just say it—they proved it with a rigorous 43-blood test panel. Every participant came out clear, with no drop in their quality of life.
And yes…
Every single participant saw their bone density increase.
Is AlgaeCal Safe For Long-Term Use?
Worried about long-term use? Don’t be.
In another study, researchers tracked 172 postmenopausal women for seven straight years. That’s right—these women took AlgaeCal every single day for seven years!
The results? Published in the Journal of the American College of Nutrition, and they don’t lie: not one woman had any adverse side effects. Not a single one. And we’re not talking guesses here—45 different blood tests confirmed it. AlgaeCal is totally safe, even after seven years of daily use.
But here’s the best part…
These women didn’t just dodge side effects—they actually increased their bone density. That’s right. Stronger bones, proven over seven years of research, and not a single adverse side effect.
“I’ve had no side effects, and the results have been amazing.”
That’s exactly what 54-year-old Roxanne Cummings from Cope, South Carolina, said in 2021 after seeing a 7.8% increase in her bone density. She even sent us a video to say “thank you” for the amazing results. Pay close attention at the 2:20 mark—she says it all.
And Roxanne’s not the only one. AlgaeCal has over 5,000 reviews on Amazon, with an average rating of 4.7 stars. And you’ll notice a common theme among those reviewers: no adverse side effects.
Their Bones Got Stronger. Yours Can Too.
This form of calcium doesn't have the side effects that the others do......I've been taking this for almost a year and no problems.
I have been taking this calcium product for 2 years. It has none of the side effects that other calcium products have, such as constipation. It is a plant based product.
Fantastic product!!! I am so thankful i found this. I never could take calcium. I tried every product that i could find! Everyone of those product had the same affect! I felt terrible after using them. AlgaeCal plus has none of the side effects! For the first time i can take calcium... I almost found it to late! I hope all of the ladies who can't take calcium find this product. Bone health is as improtant as other supplements you take! This product is truley a blessing!!!!!
I'm very hopeful that this will work for stronger bones. I've only been taking it a short time, but no side effects of any kind. Next bone density isn't for several months, so we'll see what happens then. I'm hoping for improved results!
Size: 120 Count (Pack of 1) | Verified Purchase
I have taken this for three years now. After two years , I went from osteoporosis to osteopenia. Next January will tell me how much more progress I have made. Easy to take with no side effects.
Size: 120 Count (Pack of 3) | Verified Purchase
But wait, doesn’t calcium cause constipation, gas, and bloating?
You’ve probably heard that before, and yeah—it’s true. But here’s why. Traditional calcium supplements, like calcium carbonate and calcium citrate, are made from rocks. And since the human body isn’t designed to digest rocks, it’s no surprise people end up with bloating, gas, or constipation when they take those cheap, rock-based supplements.
That’s where AlgaeCal is better. It’s sourced from organic algae—hand-harvested from a beach, sun-dried, and ground into powder. That’s it. No fillers. No nasty additives. Just pure, plant-based calcium your body knows how to use.
So when people ask, Is AlgaeCal safe? Our answer is simple: Yes—just as safe as eating your broccoli or carrots.
Are All Plant-Based Calcium Supplements Safe?
No. Just because a supplement is plant-based doesn’t mean it’s automatically good for you. Many of them miss the mark when it comes to nutrient balance. For example, calcium and magnesium need to be in the right ratio—ideally 2:1. Too much calcium and not enough magnesium, and you’re setting yourself up for digestive problems like bloating or constipation.
Why? Magnesium is what helps your body properly absorb calcium. Without it, you’re not only missing out on the benefits—you’re inviting unwanted side effects.
And it doesn’t stop there. AlgaeCal goes further by including vitamin K2-7, which plays a crucial role in directing calcium where it belongs—into your bones and away from your arteries and soft tissues. That means stronger bones and no risk of calcium buildup in places it shouldn’t be.
In fact, AlgaeCal contains all 16 of the clinically-supported bone-building nutrients your body needs—in perfect balance. That’s why you get all the benefits, without the digestive discomfort or safety concerns of other supplements.
Increase Bone Density. Naturally.
If you want to increase your bone density—and do it naturally—there’s only one option: AlgaeCal. That’s right, it’s not just an option, it’s the only one.
Why? Because AlgaeCal is the only calcium supplement in the world that’s clinically supported to increase bone density. No other calcium supplement can legally make this claim.
AlgaeCal has been studied in 3 separate clinical trials. The results of these trials were published in peer-reviewed scientific and medical journals. These studies came to the same conclusion: AlgaeCal increases bone density.
And that’s not all—those same rigorous studies also proved something else: AlgaeCal has zero adverse side effects. So, you get stronger bones, naturally, with none of the risks.
AlgaeCal Is FREE…
Most people go for the Bone Builder Pack—and for good reason. It’s the option with guaranteed results.
If your bone density doesn’t increase within 6 months, you get a full refund. No sneaky small print. Just your money back, no questions asked.
So really, there’s nothing to lose. You either get stronger bones—or it’s completely free.
YES! I want to build brand-new youthful bone now!
Special Introductory Offer Today + Free Shipping
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Frequently Asked Questions
AlgaeCal sells the world’s only calcium supplement that increases bone density.
What is AlgaeCal Plus?
What is Strontium Boost?
Do I have to take both AlgaeCal and Strontium Boost?
I have trouble swallowing pills. How big are the capsules? Is it OK to open the capsules and mix it with food/beverages?
Does AlgaeCal Plus cause side effects such as deposits in kidneys or arteries?
Can I take AlgaeCal Plus if I am on bone medications?
Does my doctor know about AlgaeCal?
What is the Stronger Bones for Life Guarantee?
How do I change the address on my subscription order?
How do I change the product(s) on my subscription order?
How do I change the delivery date of my next subscription order?
How do I change the credit card for my subscription orders?
Can I pause my subscription?
What if I have sensitivities to AlgaeCal/decide it's not right for me?
How do I return my order?
What is the Stronger Bones for Life Guarantee?
Where does my order ship from? And will I be charged customs charges?
When will I receive my order? What about Express Shipping? What shipping methods are used?
Where can I find the price on the packing slip?
Does AlgaeCal charge for shipping?
Does AlgaeCal ship internationally?
Why was my credit card declined? Why won’t my payment go through?
Can I pay with Canadian Currency or other currencies?
What forms of payment do you accept?
Where can I buy AlgaeCal Products?
Can I buy AlgaeCal on Amazon?
Do you have a subscription or autoship program?
What are your subscription program Terms and Conditions?
Does AlgaeCal offer samples?