Supplement analysis backed by scientific evidence · PT

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Moderate evidenceBrain & cognition

Sage Extract

Sage extract has a genuine cholinergic mechanism and several small human trials showing acute improvements in attention and memory, plus one positive four-month trial in Alzheimer's disease that was never replicated. The effects are real but small, and thujone content makes extract choice matter.

What the science says

  • Acute improvement in attention and memory in healthy adults Moderate evidence

    In a placebo-controlled trial of 94 healthy adults, a single 600 mg dose of Salvia officinalis extract improved accuracy and speed on a repeated cognitive demand battery over the following hours; a 300 mg dose produced weaker effects. Multiple earlier crossover trials at 300-600 mg found similar acute gains in secondary memory and alertness. Effect sizes are modest and the chronic-dosing arms have been less consistent than the acute ones.

  • Cognitive benefit in mild-to-moderate Alzheimer's disease Limited evidence

    A 4-month double-blind trial in 42 patients found significantly better ADAS-cog scores with a Salvia officinalis alcoholic extract (60 drops/day) than placebo, with less agitation. It is a single small single-country trial from 2003 that no group has replicated in two decades — encouraging, not established.

  • Reduces menopausal hot flashes Limited evidence

    Open-label and small controlled studies of sage leaf preparations report 50-64% reductions in hot flash frequency over 4-8 weeks, but hot flashes have one of the highest placebo response rates in medicine (typically 20-50% reduction on placebo). Without adequately powered blinded trials this claim stays unproven.

  • Inhibits acetylcholinesterase Moderate evidence

    Sage extracts inhibit acetylcholinesterase and butyrylcholinesterase in vitro, the same enzyme family targeted by donepezil, and this is the leading explanation for the acute cognitive effects. The inhibition is weak compared with pharmaceutical inhibitors, which is consistent with the modest clinical signal.

Dosage & safety

Studied doseCognitive trials used 300-600 mg of standardized dried leaf extract acutely, or 50 microlitres of Salvia lavandulaefolia essential oil. The Alzheimer's trial used 60 drops/day of a 1:1 alcoholic extract for 4 months. Culinary use (1-3 g dried leaf as tea) is far below trial doses.
SafetyThe key issue is thujone, a neurotoxic and convulsant monoterpene in Salvia officinalis essential oil. High-dose or prolonged use of thujone-rich preparations (especially the essential oil) has been linked to seizures, and European regulators cap thujone exposure in herbal products; aqueous and CO2 extracts are usually thujone-poor and are the safer choice. Avoid in epilepsy and in pregnancy (sage is a traditional emmenagogue and can reduce lactation — which is why it is also used deliberately for weaning). Mild cholinergic side effects and possible additive effects with cholinesterase-inhibiting drugs. Not prohibited in sport.

Scientific references

Where to buy

Swanson Vitamins, Sage Extract, 160 mg, 100 Capsules

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