Supplement analysis backed by scientific evidence · PT

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Limited evidenceBrain & cognition

Sideritis (Greek Mountain Tea)

A Mediterranean herbal tea studied for cognition and neuroprotection. One properly designed human trial found only small and inconsistent cognitive effects; the striking results are all in mice.

Evidence last reviewed: August 2026

What the science says

  • Cognition in healthy adults Limited evidence

    A double-blind, randomized, placebo-controlled parallel-groups study of a Sideritis scardica extract in healthy humans measured acute and 4-week effects on cognition and cerebral blood flow. The results were modest and task-specific rather than a broad improvement in cognitive performance.

  • Neuroprotection in animal models Limited evidence

    Sideritis extracts improved memory in amyloid-model mice and in scopolamine-treated rats, and reduced amyloid aggregation in a nematode model. These preclinical findings drive the marketing but have not been tested against clinical endpoints in people.

  • Antioxidant and cardiometabolic claims Limited evidence

    A review of Sideritis bioactives summarizes anti-inflammatory and cardiometabolic activity largely from laboratory work, and a small randomized study of a Sideritis-enriched food reported antioxidant marker changes in healthy subjects without clinical outcomes.

Dosage & safety

Studied doseTraditional preparation is 2–4 g of the dried flowering tops steeped as tea, once or twice daily. The human trial used a standardized dry extract; no optimal supplement dose is established.
SafetyLong human food use and few reported adverse effects; mild gastrointestinal upset is the usual complaint. Sideritis species are frequently substituted for one another, so what is in the bag may not be what was studied. Data in pregnancy, breastfeeding and with medications are absent — treat it as a beverage rather than a treatment.

Scientific references

Where to buy

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