Red Algae
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A broad category name for algae in the phylum Rhodophyta, a large group of marine plants that includes many distinct species. On a supplement label it usually refers to a source of minerals (often calcium) or specific extracted pigments, rather than one single defined substance.
Why it’s used
Included as a natural-source ingredient, most often to supply calcium or other minerals, or as a general marine-plant additive.
What the evidence says
Because "red algae" covers many different species and preparations, there is no single body of evidence to point to. Where a specific red-algae-derived mineral form (such as algal calcium) has been studied, the evidence generally concerns the mineral itself rather than the algae as a whole. Too little is established about red algae as a category to grade it as a distinct active.
Where we looked
There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.
- PubMed: 1 record · searched August 2026
"Red Algae"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH] - PubMed: 2290 records · searched August 2026
"Red Algae"[Title/Abstract]
This says what this database holds under these terms. It is not a finding that no research exists.
Context
Labeling as "red algae" without naming the species or extract makes it hard to tie to any specific study.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.