Algas calcareas

BotanicalAlgaeBest with a meal

What is it

Algas calcareas (or 'AlgaeCal') is a calcified marine algae product derived from Lithothamnion (a red algae genus) harvested off the South American coast. It provides plant-based calcium with trace minerals.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Bone density (with K2/D3)

Limited Evidence

Several manufacturer-funded trials suggest improvements in bone density with AlgaeCal Plus over 1-7 years. Independent replication and head-to-head comparison with standard calcium are limited.

How it works

Lithothamnion algae accumulate calcium and over 70 trace minerals (including magnesium, boron, strontium, and silica) from seawater into their skeletal structure. Supplements deliver these minerals together, marketed as a more 'whole-food' alternative to inorganic calcium salts. Several company-funded trials of AlgaeCal Plus (often combined with vitamin D, K2, and magnesium) suggest possible bone density improvements; independent replication is limited.

Dosage

Typical AlgaeCal products provide 720 mg of calcium per dose, often taken in 2 daily servings.

When and how to take it

WHEN: Divided doses with meals. HOW: With water and food; separate from thyroid medication by 4 hours and from certain antibiotics by 2-4 hours.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Lithothamnion-based calcium

Whole-algae mineral matrix.

Calcium provided alongside many trace minerals.

Safety

Generally well tolerated. Mild GI side effects (constipation, gas) are common with calcium supplements. Strontium content (~5 mg per dose) is much lower than therapeutic strontium ranelate but still present.

Who should be cautious

Caution with kidney disease (cumulative mineral load) and hypercalcemia. Discuss with clinician if on thyroid medication or bisphosphonates.

Interactions

Calcium interferes with absorption of certain antibiotics (quinolones, tetracyclines), bisphosphonates, and levothyroxine. Separate timing by 2-4 hours.

Frequently asked questions

Is algae calcium better than calcium carbonate?⌄

Maybe modestly, due to trace minerals and possibly better tolerability. The price difference is significant, and head-to-head clinical evidence is limited.

References

Algas calcareas on Wikidata — Wikidata link

Algas calcareas on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Algas calcareas (PubMed search) — PubMed link

Track Algas calcareas with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.