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Algas Calcareas

Also known as: Calcareous algae, Calcifying algae, Marine calcareous algae, Corallina, Lithothamnion, Maërl, Algas calcareas

Overview

Algas calcareas refers to a group of marine algae, including genera like Corallina, Lithothamnion, and Maërl, characterized by their unique ability to deposit calcium carbonate within their cell walls. This natural calcification makes them an excellent and bioavailable source of calcium and other essential trace minerals. Primarily harvested from cold-water marine environments, these algae are utilized as dietary supplements to support bone health, given their high calcium content. Beyond calcium, they also contain magnesium and strontium, and may offer additional benefits such as prebiotic and antioxidant properties. While the ecological role of calcareous algae is well-studied, clinical research specifically on their human supplementation effects is emerging. The current evidence suggests their utility as a natural mineral source, particularly for calcium intake, with some indications for broader metabolic health benefits.

Benefits

Algas calcareas primarily offers benefits for bone health due to its high calcium content. Meta-analyses indicate that calcium supplementation from algae sources significantly improves bone mineral density (BMD) and bone mineral content (BMC), especially in individuals under 35 years old, with notable improvements at sites like the femoral neck. These bone health improvements are clinically relevant for osteoporosis prevention. Additionally, broader algae supplementation, which includes calcareous algae, has been associated with modest but statistically significant reductions in body weight (around -1.65 kg), BMI (around -0.42), and waist circumference (around -1.4 cm). These anthropometric improvements are more relevant for overweight or obese adults. While potential antioxidant and anti-inflammatory effects have been suggested, these require further clinical validation. Bone density improvements typically require several months to years of consistent supplementation, whereas weight and metabolic effects may be observed within weeks to months.

How it works

The primary mechanism of action for Algas calcareas revolves around its rich calcium content. The bioavailable calcium ions provided by these algae are crucial for the formation of hydroxyapatite, the main mineral component of bone, thereby contributing directly to bone mineralization and remodeling. This interaction primarily affects the skeletal system. Beyond bone health, the natural matrix of calcareous algae, including the presence of cofactors like magnesium, can enhance calcium absorption compared to some inorganic calcium salts. There is also potential for modulation of gut microbiota by algae polysaccharides, which could influence metabolic pathways related to weight regulation. Calcium from calcareous algae is generally well absorbed, with its natural composition potentially leading to better tolerance.

Side effects

Algas calcareas is generally considered safe when consumed within recommended dosages. The most common side effects, reported in over 5% of users, are mild gastrointestinal discomforts such as constipation and bloating. Uncommon side effects (1-5%) include rare allergic reactions in individuals sensitive to marine products. Very rare side effects (less than 1%) can include hypercalcemia (excessively high calcium levels in the blood), particularly if consumed in excessive amounts or concurrently with high doses of vitamin D supplementation. Algas calcareas may interact with certain medications; it can interfere with the absorption of some antibiotics (e.g., tetracyclines) and bisphosphonates. Contraindications for its use include pre-existing hypercalcemia, a history of kidney stones, and certain parathyroid disorders. Individuals with renal impairment or those predisposed to calcium-related disorders should exercise caution and consult a healthcare professional before use.

Dosage

For bone health support, a minimum effective dose of approximately 500 mg of elemental calcium daily from Algas calcareas sources is recommended. The optimal dosage range typically falls between 500 mg and 1200 mg of elemental calcium per day, adjusted based on individual age, dietary calcium intake, and specific health needs. The maximum safe dose from all dietary and supplemental sources combined is generally considered to be up to 2000–2500 mg of elemental calcium daily to avoid potential toxicity. To optimize absorption, it is advisable to take Algas calcareas in divided doses with meals. Concurrent vitamin D supplementation is often recommended as vitamin D significantly enhances calcium uptake and utilization. Algas calcareas supplements are available in various forms, including powder, capsules, or tablets, which are typically standardized for their elemental calcium content. Factors such as vitamin D status, gastric acidity, and the presence of other minerals can influence calcium absorption.

FAQs

Is Algas Calcareas a good calcium source?

Yes, it is an excellent source of bioavailable calcium, along with other beneficial trace minerals, making it effective for bone health.

Are there any risks with long-term use?

Long-term use is generally safe within recommended doses. Excessive intake, however, could lead to hypercalcemia.

When is the best time to take it?

It is best taken with meals. This helps to enhance the absorption of calcium and other minerals.

How soon can benefits be expected?

Bone health improvements typically require several months of consistent use. Weight-related effects, if any, might be noticed sooner.

Does it replace other calcium supplements?

Yes, it can serve as a natural and effective alternative to other calcium supplements, especially for those preferring natural sources.

Research Sources

  • https://elifesciences.org/articles/79002 – This systematic review and meta-analysis by Liu et al. (2022) investigated the effects of calcium supplementation on bone mineral density (BMD) and bone mineral content (BMC) in young individuals. The study, involving 7382 participants under 35 years old, found that calcium supplementation significantly improved BMD and BMC, particularly at the femoral neck, despite heterogeneity in study designs. The findings suggest a robust benefit of calcium for bone health in younger populations.
  • https://pubmed.ncbi.nlm.nih.gov/39161296/ – Wang et al. (2024) conducted an umbrella review synthesizing evidence from 25 systematic reviews and meta-analyses on algae extracts. The review indicated that algae extracts, including those from calcareous algae, significantly reduced body weight, BMI, and waist circumference. While comprehensive, the study noted heterogeneity and low to moderate evidence quality across the included studies, suggesting a need for more high-quality research.
  • https://pubmed.ncbi.nlm.nih.gov/39461896/ – This systematic review and meta-analysis by Kazeminejad et al. (2025) examined the effects of algae supplementation on anthropometric indices. The study concluded that algae supplementation is beneficial for these indices, but highlighted significant between-study heterogeneity and low certainty of evidence (GRADE). This indicates that while there are promising trends, the overall quality of evidence for these specific outcomes is moderate to low.

Supplements Containing Algas Calcareas

Perfect Food Alkalizer & Detoxifier by Garden of Life
58

Perfect Food Alkalizer & Detoxifier

Garden of Life

Score: 58/100
Raw Organic Perfect Food Alkalizer & Detoxifier Lemon Ginger by Garden of Life
82

Raw Organic Perfect Food Alkalizer & Detoxifier Lemon Ginger

Garden of Life

Score: 82/100
Power Greens Premium Refreshing Berry by NuMedica
70

Power Greens Premium Refreshing Berry

NuMedica

Score: 70/100