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Limited evidenceImmunity

Euglena (Paramylon)

A microalga whose beta-glucan, paramylon, is sold for immunity and gut health. A handful of small manufacturer-run trials report changes in immune markers, but nothing yet shows it meaningfully prevents illness.

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What the science says

  • Natural killer cell activity Limited evidence

    A randomized, double-blind, placebo-controlled trial in apparently healthy adults reported higher natural killer cell activity after Euglena powder. It was a single small trial measuring a laboratory marker rather than actual illness.

  • Cold-like symptoms Limited evidence

    One randomized controlled trial found fewer self-reported cold-like symptoms when Euglena gracilis was added to the habitual diet. It has not been replicated by an independent group.

  • Fatigue Limited evidence

    A randomized, double-blind, placebo-controlled trial of a paramylon-containing food in healthy adults reported small improvements in fatigue scores. Single study, subjective endpoint, industry sponsored.

Dosage & safety

Studied doseTrials used roughly 500 mg to 3 g/day of Euglena gracilis powder or paramylon-enriched food. Labels typically suggest 500 mg to 1 g daily.
SafetyGenerally well tolerated in short trials, with mild digestive discomfort the usual complaint. No safety data in pregnancy, in children, or beyond a few months; people taking immunosuppressants should ask a doctor first.

How to take it

TimingTiming does not matter.
With food?With food, which reduces the mild digestive discomfort.
Worth knowingParamylon is a beta-glucan fibre, so start at the low end if you bloat easily and build up over a week or two.

Interactions

With medications

  • immunosuppressants

    Paramylon is promoted as an immune activator, so it may oppose therapy that suppresses immunity. ask your doctor before starting

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does euglena (paramylon) boost immunity?

The evidence for euglena is limited: a single small trial reported higher natural killer cell activity, a lab marker, and one unreplicated trial found fewer self-reported cold-like symptoms. Nothing yet shows euglena meaningfully prevents illness.

How much euglena should I take per day?

Trials used roughly 500 mg to 3 g per day of Euglena gracilis powder or paramylon-enriched food, and labels typically suggest 500 mg to 1 g daily. Start low if you bloat easily, since paramylon is a beta-glucan fibre.

Is euglena safe?

Euglena was generally well tolerated in short trials, with mild digestive discomfort the usual complaint. There are no safety data in pregnancy, in children or beyond a few months, and people on immunosuppressants should ask a doctor first.

Scientific references

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