Sage is the culinary herb Salvia officinalis, sold as a supplement in tablets and extracts — most often for menopausal hot flushes and night sweats, and for excessive sweating generally. It is the one traditional use with reasonable modern evidence behind it. This page also covers what “Sage 300” usually means, because it is often not the herb at all.
What is Sage?
Sage the supplement is an extract of Salvia officinalis, the grey-green kitchen herb, usually a dried leaf extract in strengths around 300 mg per tablet — which is where the frequently searched “sage 300” comes from.
Its active constituents include rosmarinic acid, carnosic acid and a volatile oil containing thujone. Thujone is why strength and form matter: it is neurotoxic in quantity, which is why sage essential oil should never be swallowed and why concentrated preparations are not for long-term use.
“Sage 300” may not be the herb. It is also the name of a widely used business accounting and ERP software package. If you arrived here after seeing “Sage 300” in a work context — invoicing, ledgers, stock, payroll — that is accounting software, and nothing on this page applies. The herb and the software share a name and nothing else.
Sage is a food first. In ordinary cooking amounts it raises no concerns. Everything below concerns concentrated supplement doses.
A note if you search the medicine register yourself: the South African Medicine Price Registry has no listing for sage as a supplement. Searching it returns products whose names happen to contain those letters — Cresagen, which is rosuvastatin for cholesterol, and Fosagen, which is alendronic acid for osteoporosis. Neither has anything to do with sage. Disregard them.
What is Sage commonly used for?
Hot flushes and night sweats in menopause. The main modern use and the one with the best support. Several clinical trials, mostly small, have found sage extract reduces the frequency and intensity of hot flushes over four to eight weeks. Not strong enough to call established, but more than most herbal remedies have.
Excessive sweating (hyperhidrosis). A long traditional use, consistent with the menopausal one. Effects are usually noticed within a couple of weeks.
Sore throat and mouth inflammation. Sage gargles, sprays and lozenges are used for sore throat, mouth ulcers and gum inflammation, with modest trial evidence for throat sprays. This is a topical use, not a swallowed supplement.
Memory and cognitive function. Some short-term studies in healthy adults and in Alzheimer’s disease have shown small effects on memory and attention. This is early, and no one should substitute sage for medical treatment of dementia.
Reducing milk supply. Sage is traditionally used to help dry up breast milk during weaning. That use is real — and it is why breastfeeding mothers who do not want to reduce supply should avoid sage supplements.
Digestive complaints, blood sugar and cholesterol. Traditional or early, with limited evidence. No substitute for treatment.
Who commonly looks for Sage and why
Women going through menopause are the largest group by a wide margin — usually people wanting to try something before hormone therapy, or who cannot take it because of a history of breast cancer or clots. Sage is one of the more reasonable options there, and one of the few with any trial support.
People who sweat excessively, often after finding antiperspirants insufficient.
People with a recurring sore throat, looking at sage sprays and gargles; older adults and their families, drawn by the memory claims; people weaning a baby; and people who arrived by mistake, looking for the accounting software.
Two things are worth saying plainly to that first group. Hot flushes respond strongly to placebo — placebo groups in menopause trials often improve 20 to 30 per cent — which is why small, unblinded studies of any remedy should be read cautiously. And hormone therapy remains substantially more effective for moderate to severe symptoms; for many women it is a reasonable and safe option whose risks were widely overstated for years. Sage is worth trying for mild symptoms, but it is not the equivalent of treatment.
What to check on the label before taking Sage
- **That it is Salvia officinalis.** The Salvia genus is large. Salvia divinorum is an unrelated hallucinogenic plant; Salvia miltiorrhiza (danshen) is a Chinese herb with significant blood-thinning interactions. Different plants entirely.
- The extract strength and whether it is standardised. “300 mg” of leaf powder and 300 mg of concentrated extract are not equivalent.
- The thujone content, if stated. Lower-thujone extracts are preferred beyond short-term use.
- That it is not essential oil for internal use. Sage essential oil must not be swallowed — it has caused seizures.
- What else is in it. Menopause supplements often combine sage with black cohosh, red clover or soy isoflavones. Each carries its own cautions, and combinations make it impossible to tell what is helping.
Safety, interactions and when to seek professional advice
In cooking amounts, sage is food and is safe. The cautions below apply to concentrated supplements.
Do not take sage supplements if you are pregnant. Thujone can stimulate the uterus, and sage is traditionally avoided in pregnancy. Culinary amounts in food are fine.
Avoid them while breastfeeding unless you specifically intend to reduce your milk supply.
Do not use them if you have epilepsy or a seizure disorder. Thujone lowers the seizure threshold. This is the most serious caution here.
Speak to a pharmacist or doctor first if you:
- Have a hormone-sensitive condition — breast, uterine or ovarian cancer, endometriosis, fibroids. Sage has weak oestrogen-like activity; the significance is unclear, but it warrants a conversation.
- Have diabetes. Sage may lower blood sugar, adding to diabetes medicines. Monitor more closely.
- Have high or low blood pressure, liver disease or kidney disease.
- Take sedatives, benzodiazepines, anti-epileptic medicines, or warfarin or another blood thinner.
- Are due for surgery — stop at least two weeks beforehand.
Do not use concentrated sage continuously for long periods. Traditional guidance and modern caution both favour limited courses, because of the thujone.
Common effects are mild: dry mouth, mild digestive upset, occasional dizziness.
Stop and seek advice for a rash, itching, palpitations, unusual drowsiness, or agitation. Get emergency help for a seizure, swelling of the face, lips or tongue, or difficulty breathing.
See a doctor rather than self-treating if: hot flushes are severe or disrupting daily life; you have any bleeding after menopause, which always needs assessment; you notice a new breast lump or change; sweating is heavy, one-sided, or comes with weight loss, fever or drenching night sweats — those can indicate thyroid disease or infection; or a sore throat lasts beyond a week or brings difficulty swallowing.
Tell your doctor and pharmacist you are taking sage. Herbal supplements interact with medicines, and they cannot check for that if they do not know.
Related supplement guides
Frequently asked questions
What is sage 300 used for? If it is a supplement, it is usually a 300 mg sage leaf extract taken for menopausal hot flushes, night sweats or excessive sweating. If you saw “Sage 300” at work, that is business accounting software and unrelated.
Does sage help hot flushes? Several small trials suggest it reduces their frequency and intensity over four to eight weeks. The evidence is modest but better than for most herbal remedies. Hormone therapy remains considerably more effective.
How long before it works? Usually two to four weeks for sweating and flushes. Judge it after about a month.
Is sage safe in pregnancy? As a culinary herb in food, yes. As a concentrated supplement, no — avoid it.
Does it reduce breast milk? It is traditionally used to help dry up milk during weaning. Avoid it while breastfeeding unless that is your intention.
Can I swallow sage essential oil? No. It is high in thujone and has caused seizures. Essential oil is for external or aromatic use only.
Can I take it with epilepsy? No. Thujone lowers the seizure threshold. Avoid concentrated sage supplements.
Why does the medicine register show cholesterol tablets when I search sage? Because the search matches product names containing those letters — Cresagen and Fosagen. Neither contains sage. Disregard them.