Standardized extract according to the product.
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Sage is Salvia officinalis, a Mediterranean lamiaceous plant with a long history as a culinary and medicinal herb in European pharmacopoeias; its Latin name derives from "salvare" (to save, to heal), an etymology that reflects the high medicinal status traditionally attributed to it in Mediterranean and European cultures; the identified active components are essential oils (thujone, cineole, camphor, borneol), phenolic acids (rosmarinic acid, carnosic acid, carnosol), and flavonoids with documented activity on multiple systems: cholinergic cognitive function, menopausal hot flashes, liver function, and inflammatory processes.
Unlike many medicinal herbs with limited clinical data, sage has an interesting body of evidence in two main indications with quality clinical support: cognitive improvement in healthy adults and in mild cognitive impairment, and the reduction of hot flashes in menopause; both traditional indications have been confirmed by modern randomized trials with modest but consistent effect sizes.
Sage has been the subject of several clinical trials on cognition and memory, with consistently favorable results: in healthy adults, several small studies have documented acute improvements in episodic memory, attention, and processing speed with single doses of 167-500 milligrams of standardized dry extract or the equivalent in essential oil; these effects are attributed to the acetylcholinesterase inhibition documented in vitro for several components (especially carnosic acid and carnosol), a mechanism analogous to that of the pharmaceutical cholinesterase inhibitors used in Alzheimer's disease (donepezil, rivastigmine, galantamine).
In patients with mild to moderate Alzheimer's disease, a randomized Iranian trial published in 2003 with 42 patients showed significant improvements in cognitive and agitation scales with an ethanolic sage extract at 60 drops per day for 4 months, an indication with interesting clinical support, although with modest data in larger cohorts.
In climacteric symptoms, especially hot flashes and night sweats, several European trials have documented significant reductions with supplementation at 280-600 mg/day of standardized dry extract for 4-8 weeks; a Swiss randomized trial published in 2011 with 71 postmenopausal women showed reductions of 50-60 percent in the frequency and intensity of hot flashes with sage extract over 8 weeks.
As mouthwashes or topical application, sage extracts have documented antibacterial activity against oral flora and have traditionally been used for gingivitis, sore throat, and canker sores; some European pharmaceutical products incorporate sage extract with clinical support for mild oral mucositis and pharyngitis.
The doses studied range from 280 to 600 milligrams per day of standardized dry extract, split into one or two doses with or without food; sage essential oil (significantly more concentrated in thujone) has been used traditionally but is not recommended for therapeutic oral use because of the risk of neurotoxicity and other significant adverse effects at therapeutic doses; the traditional infusion (1-2 teaspoons of dried leaf per cup, 2-3 times a day) is a gentle form that is well tolerated for home use.
Generally well tolerated at the doses studied with standardized extract; the adverse effects described are rare and mild (mild digestive discomfort, occasionally headache); the most important safety consideration is the presence of thujone (a compound with documented neurotoxic activity at high doses) in the essential oil and in non-standardized preparations: chronic high doses of the essential oil or of products with a high thujone content can cause seizures, vertigo, and other serious neurological effects; people with epilepsy or a tendency to seizures should avoid the essential oil and uncontrolled preparations; modern standardized extracts usually have a controlled thujone content at safe levels; in pregnancy sage is contraindicated because of its described uterotonic effect and the presence of thujone; in breastfeeding, sage has traditionally been used to reduce milk production at weaning (a documented anti-galactagogue effect), so nursing mothers who want to maintain their milk supply should avoid it; people taking hypoglycemic drugs should be cautious because of possible potentiation of the effect; those taking sedatives or anticonvulsants should be cautious; commercial non-standardized products or pure essential oil should be used only with knowledge of the specific safety precautions discussed.
Information, not medical advice. Scientific evidence reflects the quality of the studies.