Most people can safely drink 3 to 4 cups of sage tea per day for short periods, but the real limit depends on a compound in sage called thujone, which can cause neurological problems at high doses. The European Medicines Agency caps safe thujone intake from sage at 5 mg per person per day, for no longer than two weeks at a time. A typical cup of sage tea made with 1 to 2 grams of dried leaves and steeped for 5 minutes contains roughly 1 to 2 mg of thujone, which puts practical daily intake at around 3 cups if you want to stay well within that boundary.
Why Thujone Is the Limiting Factor
Sage gets its distinctive flavor partly from thujone, a natural compound concentrated in the plant’s essential oil. In small amounts, thujone is harmless. At higher doses, it overstimulates the nervous system. Historical accounts of “absinthism,” a syndrome linked to thujone-heavy absinthe liquor, describe convulsions, hallucinations, and mental deterioration. Those cases involved far higher concentrations than you’d get from tea, but they illustrate why regulators set limits.
Researchers have proposed a safe daily intake of about 0.11 mg per kilogram of body weight. For a 150-pound person, that works out to roughly 7.5 mg per day. The European Medicines Agency uses a more conservative threshold of 5 mg per day from sage products specifically, accounting for the fact that you also get small amounts of thujone from food (sage-seasoned dishes, for instance). That 5 mg limit applies for a maximum of two weeks of daily use.
How Brewing Affects What You Get
The amount of thujone in your cup depends heavily on how you make it. Research published in Chemistry Central Journal found that thujone extraction increases during the first 5 minutes of steeping, then levels off. Steeping longer than 5 minutes doesn’t pull significantly more thujone into the water, but it does make the tea more bitter. Hotter water extracts more thujone than cooler water, so cold-brewed sage tea would contain less.
Using loose dried sage leaves rather than a commercial tea bag also matters. A heaping tablespoon of crushed sage contains more plant material (and more thujone) than the 1 to 1.5 grams typically found in a pre-portioned tea bag. If you’re making tea from garden sage, stick to about 1 to 2 grams of dried leaf per cup and steep for no more than 5 minutes to keep thujone levels moderate.
Short-Term vs. Long-Term Use
The two-week limit from the European Medicines Agency is the key detail most people miss. Drinking a few cups of sage tea for a sore throat, digestive discomfort, or hot flashes over a week or two falls within established safety guidelines. Drinking it daily for months is a different situation, because thujone’s effects on the nervous system can accumulate. There’s no well-studied safe threshold for indefinite daily use.
If you enjoy sage tea regularly, a reasonable approach is to cycle it: drink it for a couple of weeks, take a break, then return to it. Occasional cups here and there, a few times a week rather than every day, are unlikely to pose any concern at all.
Who Should Avoid Sage Tea
Sage tea carries real risks for certain groups. Because thujone can lower the seizure threshold, people with epilepsy or a history of seizures should avoid it entirely. The compound can work against anti-seizure medications, potentially reducing their effectiveness.
Pregnant women should also be cautious. Thujone may raise blood pressure and stimulate uterine contractions, which increases the risk of miscarriage, particularly in the first trimester. In later pregnancy, blood pressure effects can raise the risk of the placenta separating prematurely. The American Pregnancy Association has flagged large amounts of sage consumption as potentially harmful during pregnancy.
Sage can also lower blood sugar. If you take diabetes medications, particularly insulin or drugs that stimulate insulin production, adding several cups of sage tea daily could push your blood sugar lower than expected. This interaction is classified as minor, but it’s worth knowing about if you monitor your glucose closely.
Breastfeeding mothers have traditionally used sage to reduce milk supply during weaning, which means it’s the wrong choice if you’re trying to maintain or increase production.
Not All Sage Is Equal
Common garden sage (Salvia officinalis) is the variety with the highest thujone content and the one these safety limits are built around. Spanish sage (Salvia lavandulifolia) contains significantly less thujone, and some varieties have virtually none. If you’re buying sage tea specifically, check the species on the label. Greek sage (Salvia fruticosa), often sold as “Greek mountain sage tea,” tends to be higher in other compounds like eucalyptol and lower in thujone, making it a gentler option for frequent use.
Sage essential oil is an entirely different product and should never be added to tea or taken internally. The thujone concentration in essential oil is many times higher than what you’d extract by steeping leaves, and even a small amount can reach toxic levels quickly.
Practical Guidelines
- Daily amount: Up to 3 cups per day, using 1 to 2 grams of dried sage leaf per cup
- Steeping time: 5 minutes in hot water, which extracts most of the beneficial compounds without excessive thujone
- Duration: No more than 2 weeks of daily use before taking a break
- Occasional use: A cup here and there, a few times per week, is not a concern for most healthy adults
Sage tea used as a cooking ingredient or occasional beverage sits well within normal safety margins. The risks emerge with concentrated preparations, prolonged daily use, or pre-existing conditions that make thujone particularly problematic.