Euglena

Euglena gracilis · Paramylon

Snapshot

Indications	Contraindications
Common cold symptoms^{1, 2} Upper respiratory symptoms³ Natural killer cell activity⁴ Sleep quality^{5, 6} Mood under mental workload⁵	Known euglena hypersensitivity⁷ Prior euglena-linked skin eruption

It acts through immune modulation, including natural killer cell activity and salivary immunoglobulin A responses^{4, 6}. Supplementation is used for immune support and fewer cold symptoms, and for mood, stress response, and sleep quality. Typical users are otherwise healthy adults with recurrent colds or high stress⁴.

Human research is limited to about eight small trials, mostly in immune function and cold symptoms, with others in fatigue, mood and sleep, and visceral fat. A placebo-controlled trial in healthy, endurance-trained adults reported fewer cold-like symptoms³. In animal and cell studies summarized in a 2026 review, paramylon was among marine-derived substances with anti-obesity and fatty liver effects⁸. Products list euglena as whole-cell powder, fermentate, or isolated paramylon³; see Form comparison.

The European Food Safety Authority found no safety concerns for paramylon at the proposed uses⁹. The main caution is delayed hypersensitivity, including skin eruptions, described in a narrative review⁷. Authors of a case report found lymphocyte transformation testing unreliable for confirming reactions to euglena-containing products¹⁰.

Last updated October 16, 2026. Read how we make monographs.

In the full monograph

20 sources, 20 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources