Calcium from Red Algae for healthy bones and teeth – 120 capsules

Calcium from Red Sea Algae – 100% Natural 

WoldoHealth offers pure marine calcium from red algae (Lithothamnion sp.) in the form of plant capsules without chemical additives and fillers. This natural source of calcium is valued for its high bioavailability, gentleness on digestion, and wide spectrum of minerals contained in a single raw material.

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  Natural calcium from red algae – sustainably sourced from the Atlantic without chemical processing
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  High absorbability – better utilized than common forms of calcium (e.g., calcium carbonate)
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  120 capsules without additives – free from gluten, lactose, GMOs, dyes, and fillers

This supplement is recommended by experts as a gentle and effective form of calcium when there is a need to support bone, teeth, and muscle health.

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Dosage 

Take 2 capsules daily and drink with plenty of water. Ideally take with food for better absorption.

Composition

2 capsules / 1 dose contain:

• Dried red algae (Lithothamnion sp.) – 1 000 mg
• Calcium – 320 mg (38 % of the recommended daily dose)
• Plant capsule (hydroxypropylmethylcellulose)
   

The product does not contain gluten, lactose, GMOs, or artificial colors and is suitable for vegans.

Packaging and Product Quality

• Plastic jar with lid – secure and safe closure to maintain freshness.
• 120 plant capsules – easy dosing and consumption, suitable for vegans.
• Safety seal – ensures product integrity upon purchase.

• High-quality natural raw material – free from artificial additives, colors, and preservatives.

Breakthrough Calcium Study by Robert P. Heaney

Robert P. Heaney, MD (1927–2016) was an American endocrinologist and one of the most cited researchers in the field of calcium physiology and osteoporosis. His work defined how much calcium the human body actually absorbs and how this process differs depending on the form of intake. The following article summarizes his key clinical study from 1987 and the subsequent randomized trial from 1990, which together changed the view on supplemental calcium.

1. Calcium Bioavailability: Calcium Citrate–Malate (CCM) Study, 1987

Heaney et al. tested calcium citrate–malate (CCM) against traditional calcium carbonate and cow's milk. The study used double isotope methods in 15 healthy women and 6-day tracer retention in rats.^[1] CCM was absorbed ~35% better than carbonate and achieved similar absorption to milk, despite containing a smaller volume of elemental calcium.

Methodology

• Design: crossover, each subject received all three sources of calcium.
• Dosage: 250 mg of elemental Ca in each tested form.
• Evaluation: fractional absorption using urinary isotope ratio and bone ^45Ca retention in rats.

Key Results

• CCM demonstrated the highest absolute absorbability (37% vs 27% for carbonate).
• When administered in orange juice, absorption was 5 percentage points higher, sparking a trend of fortified beverages with CCM.
• The study demonstrated that salt solubility is a key factor for calcium bioavailability.

2. Follow-up RCT: Bone Mass Density in Postmenopausal Women, 1990

In a randomized, double-blind, placebo-controlled study, Robert P. Heaney's team followed 301 healthy women aged 55–75 for two years.^[2] Half had Ca intake <400 mg/day. The intervention was 500 mg Ca (carbonate or CCM) daily.

• Spinal and femoral BMD was maintained in the supplement group, while it decreased by ~1% annually in the placebo group.
• The greatest effect was seen in women with the lowest baseline calcium intake (<400 mg/day).
• No serious adverse events or hypercalcemia were reported.

3. Implications for Clinical Practice

Heaney's evidence supported recommendations:

1. Prefer highly soluble salts (e.g., citrate-malate) with low gastric acidity or when taken on an empty stomach.
2. Supplement the dose if dietary intake falls below 1000–1200 mg/day, especially in postmenopausal women.
3. Combine with vitamin D only in deficient or institutionalized patients.

4. About the Author

Dr. Heaney served for over 50 years at Creighton University, published more than 450 papers, and received the title Legend of Osteoporosis.^[3][4][5] His "Nun Study" and articles on vitamin D defined new recommendations for calcium and D intake not only in the USA but also in the World Health Organization.

5. References

1. Heaney RP, Weaver CM, Fitzsimmons ML. Absorption of calcium from a new calcium delivery system (calcium citrate–malate). Calcif Tissue Int. 1987;41(6):351–352. [PMID: 3124946]
2. Heaney RP et al. A controlled trial of the effect of calcium supplementation on bone density in postmenopausal women. N Engl J Med. 1990;323:878–883.
3. Gallagher JC. Robert Proulx Heaney, MD (1927–2016). J Nutr. 2017;147(9):1605–1607.
4. Melton LJ. Robert P Heaney, MD: 1927–2016. J Bone Miner Res. 2016;31(11):1913–1914.
5. Heaney RP. Calcium, Dairy Products and Osteoporosis. J Am Coll Nutr. 2000;19(2 Suppl):83S–99S.
6. Weaver CM, Heaney RP. Comparative absorption of calcium sources and calcium citrate malate. Altern Med Rev. 1999;4(2):74–85.
7. Heaney RP, Smith KT, Recker RR, Hinders SM. Meal effects on calcium absorption. Am J Clin Nutr. 1988;49:372–376.
8. Heaney RP. Normal calcium absorption is not high. Am J Clin Nutr. 2001;74(5):635–644.
9. Research.com. Robert P. Heaney: Academic Profile. (online)
10. BMJ. Robert P Heaney. 2016;354:i5111.