The Bone Builder Pack


Over 5 Million Bottles Sold

Increase Bone Density in 6 months. Guaranteed

You will see increased bone mineral density on every DEXA scan you take, starting as soon as 6 months. If any scan shows a decrease, you will be refunded for all purchases between that scan and the last.

So you either get stronger bones, or your money back.

Each AlgaeCal capsule contains all the nutrients your bones need, in a whole-food form your body can easily absorb. Includes organic marine calcium (Lithothamnium superpositum) plus 15 additional bone-supporting minerals and vitamins.

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Absolutely! “AlgaeCal is a unique bone health supplement,” says Harvard-trained medical expert Dr. Lawrence May. Its ability to increase bone density was confirmed by 3 clinical studies. And that’s why AlgaeCal is supported by thousands of medical professionals.

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Why the Bone Builder Pack?

Guraranteed Results Icon

Guaranteed Results

Plant Based Icon

Plant-Sourced Calcium

16 Nutrients Icon

16 Bone-Essential Nutrients

Non-GMO Icon


Easy To Swallow Icon

Easy To Swallow

Gentle for Your Body Icon

Gentle For Your Body

AlgaeCal Plus

16 Bone-Essential Nutrients

Powerful plant-based serving of 16 bone-essential nutrients. In human clinical trials, these 13 minerals & 3 vitamins have been shown to increase bone density - even for folks in their 80s


120 Easy-to-Swallow Veggie Capsules Per Bottle

Suggested Use

4 capsules daily (2 capsules twice a day with meals)

Drug Interactions

Will AlgaeCal Interfere with my medication(s)?

Some medications and supplements require separation from AlgaeCal Plus to limit any potential interactions. For example, thyroid medication, antacids, and certain antibiotics should be taken at least 4 hours from AlgaeCal Plus. Iron supplements also should be separated correctly.

If you take a standalone iron supplement, please take it 2 hours from AlgaeCal Plus to avoid decreased absorption. If your iron comes from a multivitamin, you do not need to separate it from AlgaeCal Plus.

Vitamin K2, including the vitamin K2 in AlgaeCal Plus, may interfere with certain anticoagulant drugs and should be avoided unless otherwise directed by a physician.

For general guidelines about how to take AlgaeCal, please reach out to our Bone Health Consultants at [email protected] or by calling 1-800-820-0184. Always check with your doctor for details about possible interactions between AlgaeCal products and your medications.


The “Plus” in AlgaeCal Plus

Calcium 720 mg
(As AlgaeCal® L. Superpositum)
AlgaeCal is a unique calcium that contains all 13 essential bone-building minerals. Studies show these plant-based nutrients can stop bone loss – and even increase your bone density.
Magnesium 350 mg
(As Magnesium Oxide & AlgaeCal® L. Superpositum )
If you want better bones, then you need more magnesium. Clinical studies show people with healthy magnesium levels have better bone density than their magnesium-deficient counterparts.
Vitamin D3 1600 IU
(As Cholecalciferol)
Vitamin D is vital for your bone health. Without this essential nutrient, your body can’t absorb calcium, and that’s bad news for your bones. But don’t worry – every serving of AlgaeCal Plus has a generous 1,600 IU of this bone-building vitamin.
Vitamin K 100 mcg
(As Menaquinone-7)
You need vitamin K2 because it collects calcium from your bloodstream and directs it into your bones - keeping them healthy and strong. You don’t want calcium getting into your soft tissue - where it can cause heart attacks, strokes, and even Alzheimer’s.
Boron 3.0 mg*
(As Boron Glycinate)
This essential nutrient helps your bones get the calcium, magnesium, and vitamin D they need to stay healthy and strong. It also helps your body make collagen, the main protein that holds your bone together.
Vitamin C 50mg
(As Calcium Ascorbate)
Vitamin C helps your body fight the root cause of bone loss. A 17-year study found that a high intake of this vitamin reduced the likelihood of hip and non-vertebral fractures.
Potassium Trace
(As AlgaeCal® L. Superpositum)
By helping to neutralize the acidic pH resulting from the Standard American Diet, potassium prevents the loss of calcium from bone to restore a more alkaline pH, thus conserving calcium within our bones and reducing its loss in urine.
Copper Trace
(As AlgaeCal® L. Superpositum)
Copper is essential in bone metabolism, activating enzymes like lysyl oxidase that incorporate both collagen and elastin into the organic component of bone.
Manganese Trace
(As AlgaeCal® L. Superpositum)
Manganese is critical in the formation of the extracellular matrix–the ground substance to which collagen adheres, and for the development of chondrocytes, the cells that secrete cartilage and become bone building- osteoblasts and eventually osteocytes, which regulate the entire bone renewal process. Without manganese, bone mineralization simply cannot start!
Silicon Trace
(As AlgaeCal® L. Superpositum)
Silicon plays a key role in bone formation by stimulating the production of bone-building osteoblasts and the synthesis of type 1 collagen, and by increasing calcium’s incorporation into bone.
Nickel Trace
(As AlgaeCal® L. Superpositum)
Nickel can affect the distribution of other nutrients in your body, including calcium. Given the obvious benefit calcium has on our bones, you can see why an adequate level of nickel is critical to maintaining healthy bone!
Phosphorus Trace
(As AlgaeCal® L. Superpositum)
Approximately 85% of the body’s phosphorus is found in your bones. It’s fundamental to growth, maintenance, and is necessary along with calcium and magnesium for proper growth and formation of bones.
Selenium Trace
(As AlgaeCal® L. Superpositum)
Selenium is the required cofactor for two groups of enzymes intimately tied to bone health: the selenoenzymes, which neutralize bone-destructive free radicals and the deiodinase enzymes, which are necessary for the healthy thyroid function that keeps our bone renewal metabolism running. For these reasons, low selenium can mean decreased bone mineral density.
Strontium Trace
(As AlgaeCal® L. Superpositum)
This essential nutrient helps your bones get the calcium, magnesium, and vitamin D they need to stay healthy and strong. It also helps your body make collagen, the main protein that holds your bone together.
Vanadium Trace
(As AlgaeCal® L. Superpositum)
In one study, vanadium compounds were shown to increase bone formation without any adverse health effects!
Zinc Trace
(As AlgaeCal® L. Superpositum)
Zinc is an essential mineral that plays a crucial role in bone metabolism by acting as a cofactor for specific enzymes. But that’s not all - studies have found that zinc can also help prevent bone loss, making it a vital nutrient for both men and women, especially those in their post-menopausal years.

Strontium Boost

Strontium Boost

Triple Your Bone Density Increases

Strontium Boost naturally accelerates the bone-building process. In clinical studies, participants who took this natural product alongside AlgaeCal Plus tripled their bone density increases.


60 Easy-to-Swallow Veggie Capsules per bottle. Pure Clinical Grade Strontium Citrate.

Suggested Use

Take 2 capsules before bed, with or without food, but separate from calcium by at least 2 hours.

Drug Interactions

Will Strontium Interfere with my medication(s)?

Always check with your doctor for details about possible interactions between AlgaeCal products and your medications as some may require separation. If you have impaired kidney function, please consult with your healthcare provider before using Strontium Boost.


What's Inside?

Strontium 680 mg
(As Strontium Citrate)
This essential nutrient helps your bones get the calcium, magnesium, and vitamin D they need to stay healthy and strong. It also helps your body make collagen, the main protein that holds your bone together.

Their Bones Got Stronger and So Can Yours

Every day we get "thank you" videos from grateful customers who have increased their bone density. But be warned: if you attempt to watch ALL these inspiring videos on our video page, it'll take you 7 hours and 11 minutes.

Thank you so much for developing this product and making my life so that I can live it to the fullest!"

18.2% T-Score Increase

I feel like this is an investment for the future, for strong bones, and that's what I really want. I am very confident using the AlgaeCal Plus and the Strontium.

35.9% T-Score Increase

It was as if I was given back 30 years!

14.81% T-Score Increase

I’ve had no side effects. And the results have been amazing!

50% T-Score Increase

This was the second time that I had an increase as a result of taking AlgaeCal and Strontium.

20.69% T-Score Increase

The #1 Bone Building Supplement

The Bone Builder Pack combines the benefits of the 16 bone-supporting nutrients in AlgaeCal Plus – including our organic ocean calcium, boron, magnesium, vitamin C, vitamin D3, and vitamin K2-7 – along with Strontium Boost which naturally accelerates your body’s bone-building processes.

Clinically supported to increase bone density after 6 months.

Enjoy Our Stronger Bones For Life Guarantee

Who else promises you will increase your bone density year after year for the rest of your life? It may sound too good to be true, but we've been offering this guarantee since 2016.

Supported by Thousands of Medical Professionals

Lawrence A. May, MD
Lawrence A. May, MD

Professor at the University of California at Los Angeles School of Medicine

Harvard College, Harvard Medical School, Massachusetts General Hospital

Lara Pizzorno
Lara Pizzorno
Bone Health Expert

Best-selling author of Healthy Bones Healthy You!

Editor of Longevity Medicine Review, and Senior Medical Editor for Integrative Medicine Advisors

Dr. Loren Fishman
Dr. Loren Fishman

Medical Director, Manhattan Physical Medicine & Rehabilitation and Founder

Yoga Injury Prevention Website Manhattan Physical Medicine & Rehabilitation

Dr. Liz Lipski
Dr. Liz Lipski

Professor and Director of Academic Development

Nutrition programs in Clinical Nutrition at Maryland University of Integrative Health

Our Clinical Studies

The ONLY calcium supplement clinically supported to increase bone density


Nutrition Journal




Average bone density increase

AlgaeCal Plus and Strontium Boost increase adult bone density after 6 months.

PubMed ID: 21492428


International Journal of Medical Sciences




Minimum recorded bone density increase

Examines the effect of 3 AlgaeCal formulations on post-menopausal women's bone density after 1 Year.

PubMed ID: 21448303


Journal of the American College of Nutrition




Minimum increase in recorded bone density

Women who took AlgaeCal Plus and Strontium Boost for 7 Years Showed Continually Increasing Bone Density, plus Safety.

Download Study

The World’s #1 Bone Health Support Group

The AlgaeCal Community is an exclusive Facebook group for AlgaeCal customers. Join thousands of like-minded people who are working toward renewed bone health. It’s a friendly, non-judgemental space where you can ask questions, celebrate successes – and even make new friends.

Community Group Icon 25,000+ supportive members

Exercise Icon Dozens of bone-building exercise videos

Recipes Icon 100s of delicious recipes

Videos Icon Live video sessions with experts

Questions Icon Questions answered by bone health experts

Frequently Asked Questions

  • What is AlgaeCal Plus?

    AlgaeCal is a South American marine algae species, Lithothamnium superpositum (or Algas calcareas as the locals call it). This kiwi-fruit sized algae is sustainably hand harvested in the Atlantic ocean, sun dried, then milled into a powder. There is no extraction process or additives used – just pure whole food calcium and minerals coming from a living plant.

    AlgaeCal powder is the foundational ingredient in our products, AlgaeCal Basic and AlgaeCal Plus. AlgaeCal powder has significant advantages over traditional calcium supplements that are pure calcium because AlgaeCal contains all 13 known essential bone supporting minerals: calcium, magnesium, manganese, phosphorous, nickel, silica, copper, vanadium, potassium, zinc, boron, selenium and strontium. Traditional calcium carbonate and calcium citrate supplements are made from limestone and marble – and your body does not absorb rocks very well – so plant-sourced AlgaeCal has the benefit of being body-friendly and better absorbed into your bones.

    To maximize your bone-building, take 4 capsules of AlgaeCal Plus a day. (This was the dosage that led to the most significant bone density increases in clinical trials).

    We recommend splitting the daily 4 capsule dose into 2 servings of 2 capsules throughout the day. Your body can only absorb 500mg of calcium at a time, so taking more than 2 AlgaeCal capsules in one serving would lead to unabsorbed calcium.

    And finally, it’s best to take your AlgaeCal Plus with food. That’s because taking calcium with food increases how well you absorb it. When you eat, your stomach produces acid that dissolves the minerals in AlgaeCal Plus so they can be properly absorbed when they reach your intestinal tract.

    For more information on scheduling your AlgaeCal supplements with meals –– and any prescription medication or supplements you’re currently taking –– click here.

  • What is Strontium Boost?

    Strontium is a mineral that is naturally found in the earth, in your food, and in your bones. Our product, Strontium Boost, contains the mineral strontium bound to citrate (think citric acid from fruit) to form (natural) strontium citrate. Strontium Boost helps with your bone remodelling process by increasing the rate of your bone building cells so that you build bone faster and at the same time, it slows down your bone deterioration. Strontium Boost is the only strontium citrate product backed by human clinical studies showing its safety and efficacy when it comes to low bone density. In fact, Strontium Boost, together with AlgaeCal Plus, is guaranteed to increase your bone density in as little as 6 months.

  • Do I have to take both AlgaeCal and Strontium Boost?

    If you are suffering from bone loss, it is best to take both AlgaeCal Plus and Strontium Boost. Together they are clinically supported to increase bone density in as little as 6 months – at any age! They also increase your bone density at a faster rate than AlgaeCal Plus alone.

    For example, studies prove AlgaeCal Plus alone can increase bone density by an average of 1.3% per year, compared with an average bone density increase of about 4% per year with AlgaeCal Plus and Strontium Boost together. This is significant for those suffering from bone loss who may be experiencing more than 1% bone density loss per year. Taking the two together also gives the bone-building process a “kick start” to increase bone density safely and naturally, ensuring you have covered any potential losses. Want to hear success stories from real customers? Watch their videos and see before and after DEXA scans here.

  • I have trouble swallowing pills. How big are the capsules? Is it OK to open the capsules and mix it with food/beverages?

    AlgaeCal Plus, AlgaeCal Basic, and Strontium Boost all use soft capsules which are ¾” long and easy to swallow. If you do have trouble swallowing them, the two-part capsules can be pulled apart. You can then sprinkle the tasteless powder into your favorite drinks and food. We recommend semi-solid foods such as smoothies, applesauce or yogurt and avoiding hot drinks as temperatures above 120 degrees Fahrenheit as it may reduce the potency of the vitamins C, D, and K2. Please note that the AlgaeCal powder is only partially water soluble due to the many natural minerals and therefore does not dissolve completely in liquid.

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

    Unlike traditional, rock-derived calcium supplements, AlgaeCal has no adverse 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 calcium you get from eating vegetables such as broccoli, kale and peas. Some studies have shown that calcium from food sources does not increase soft tissue calcification because foods that naturally contain calcium also supply other minerals, which helps transfer the calcium directly into your bones rather than soft tissues like arteries, kidneys and eyes. Additional magnesium, boron, vitamin K2 and vitamin D3 are added into AlgaeCal Plus to optimize absorption and transport to the bone rather than soft tissues. All these factors translate to efficient absorption and placement into bone tissue. AlgaeCal is also much safer for you because it is more effective at a lower dose. At 720 mg per day of calcium, AlgaeCal Plus is increasing bone density in adults. Compare that to regular calcium supplements that have been studied at 1200 mg per day – and only slow bone loss.

  • Can I take AlgaeCal Plus if I am on bone medications?

    Absolutely. All bone drugs require calcium supplementation to supply the needed calcium for bone building – and AlgaeCal Plus is the highest quality calcium available. We recommend separating your prescription medication from your AlgaeCal.

  • If AlgaeCal Plus is so good why doesn’t my doctor know about it?

    An increasing number of doctors are aware of the significant science supporting AlgaeCal products and are referring their patients to them. It is extremely difficult for doctors to keep up with the flood of new studies being reported in the journals. If you would like to provide your doctor with the science backed information on AlgaeCal, please refer to our Research Page. In addition, we also offer a convenient, one-page printout that you can take to your doctor: Take It To Your Doctor PDF.

  • What is the Stronger Bones for Life Guarantee?

    You need strong bones for the rest of your life to enjoy, rather than endure, your golden years. With our guarantee, you can continue enjoying your favorite activities for the rest of your days.

    Measurable improvements will appear at 6 months from when you start your AlgaeCal Plus and Strontium Boost program. So if your next DEXA scan is scheduled half a year or more from now, we guarantee you will see a bone density increase.

    You may choose to wait for your next scheduled scan so that it is paid for by your insurance, or you may choose to pay out of pocket to check your results earlier. Either way is fine.

    Just allow at least 6 consecutive months of taking the products as directed before your follow-up scan. We encourage you to take a scan every year to make sure you’re still building new bone.

    IMPORTANT: Ensure you get your DEXA scan at the same clinic every time. Ideally, you’d get your scan on the same machine, too. That way, every scan is directly comparable to the last. If any DEXA does not show an improvement in either hip or spine bone density you will be refunded for all products purchased since your previous scan.

    Your 3 Steps to Guaranteed Bone Density Increases

    1. Have a DEXA scan that is not more than 30 days old to establish a baseline measurement. (If you had a DEXA scan more than 30 days ago, your guaranteed period will launch from your next scan onward. So don’t wait! Get started building healthy new bone right now before your guarantee begins.)
    2. Take AlgaeCal Plus and Strontium Boost at full dose as directed for at least six months.

    3. Get your follow up DEXA scan from the same clinic as your first scan. It doesn’t matter when… six, twelve, even 24 months after you start – as long as you have continued to use your products between scans.

    If your follow up scan does not show an increase in your hip or spine bone density, we refund every penny you paid us between those two scans.

Which AlgaeCal is Right For You?

Early-Stage Support
A Bottle of AlgaeCal
Stop Bone Loss
Those looking to prevent bone loss and maintain healthy bones every single day As far as prevention goes it’s never too early to start!
Shop Now
Mid-Stage Support
A Bottle of AlgaeCal Plus
AlgaeCal Plus
Increase Bone Density
Those who haven’t had a DEXA scan yet but bone loss is on their radar due to family history or age. They want to strengthen their bones.
Shop Now
Late-Stage Support
A Bone Builder Pack
Bone Builder Pack
Stronger Bones For Life
Those who have been diagnosed with low bone density or suffered a fracture. They are actively looking to increase bone density.
Shop Now

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