Sage used in normal cooking amounts is generally considered safe during pregnancy. The concern starts when you move beyond a pinch in your stuffing to concentrated forms like sage tea, supplements, or essential oils. These deliver much higher levels of a compound called thujone, which has properties that can be harmful during pregnancy.
Cooking With Sage Is Low Risk
The National Institutes of Health considers sage “likely safe in the amounts commonly found in foods.” That means seasoning a dish with a teaspoon of dried sage or tossing a few fresh leaves into a recipe is not a recognized risk. The amount of thujone you’d get from normal cooking is small enough that it doesn’t raise red flags in the research.
Where things shift is quantity and concentration. A butternut squash recipe calling for a tablespoon of sage leaves is a very different exposure than drinking multiple cups of sage tea daily or taking a sage supplement capsule. The more concentrated the form, the more thujone you consume, and thujone is the ingredient that matters here.
Why Thujone Is the Problem
Thujone is a naturally occurring compound in sage (Salvia officinalis) that exists in two forms. In small amounts, it’s harmless. In larger doses, it interferes with a key signaling system in the brain and nervous system, blocking receptors that normally keep nerve activity in check. This is the mechanism behind its ability to cause muscle spasms and, at high enough doses, convulsions. Research confirms that thujone can cross the blood-brain barrier when taken orally.
For pregnancy specifically, the concerns are more direct. Thujone-rich oils have been identified as both abortifacient (capable of inducing miscarriage) and contraceptive in research. In one animal study, pregnant mice fed Dalmatian sage oil showed disrupted embryo development. No equivalent clinical trials have been done in humans, for obvious ethical reasons, but the animal evidence is consistent enough that researchers recommend avoiding thujone-rich oils entirely during pregnancy.
Sage Tea and Supplements
Sage tea falls into a gray area. It’s one of the most commonly consumed herbal teas during pregnancy worldwide, and it has been used for generations without systematic reports of harm. But there are no clinical trials confirming its safety for pregnant women. The general recommendation from herbal medicine reviews is to limit herbal tea consumption to no more than two cups per day during pregnancy, though this is a conservative guideline rather than an evidence-based threshold.
Sage supplements, capsules, and tinctures are a step further in concentration. These products are designed to deliver a therapeutic dose of sage’s active compounds, including thujone, and they bypass the natural dilution that happens when you brew a cup of tea. There is no established safe dosage for these products during pregnancy, and most herbalists and prenatal care guidelines suggest avoiding them.
Sage Essential Oil Is Not Safe
Sage essential oil is the most concentrated form and carries the highest risk. It contains significantly more thujone per drop than any tea or food preparation, and essential oils should never be taken internally regardless of pregnancy status. The research on reproductive toxicity is clearest here: consumption of thujone-rich essential oils should be avoided in pregnancy, full stop.
Topical use of sage essential oil (diluted in a carrier oil for massage, for example) is also generally discouraged during pregnancy. Compounds in essential oils can be absorbed through the skin and enter the bloodstream, which means the thujone exposure concern still applies, just at lower levels.
Sage Can Also Affect Milk Supply
One lesser-known property of sage is its ability to reduce breast milk production. Dried sage at doses as small as a quarter teaspoon three times daily has been used deliberately by breastfeeding mothers to manage oversupply or help with weaning. Sage tea at one to six cups per day is another method used for the same purpose.
This matters in late pregnancy and early postpartum because consuming large amounts of sage around your due date could theoretically interfere with establishing your milk supply after birth. If you’re planning to breastfeed, this is another reason to keep sage intake at normal food levels in the final weeks of pregnancy.
Practical Takeaways by Form
- Dried or fresh sage in cooking: Considered safe at the amounts you’d normally use in recipes.
- Sage tea: No proven harm, but no proven safety either. Limiting to one or two cups per day is the common conservative approach.
- Sage supplements or capsules: No established safe dose during pregnancy. Best avoided.
- Sage tinctures: Concentrated liquid extracts that deliver a high dose of active compounds. Best avoided.
- Sage essential oil: Should not be used during pregnancy, whether internally, topically, or in aromatherapy diffusers where prolonged inhalation occurs.
The bottom line is straightforward: the sage in your Thanksgiving stuffing or pasta sauce is fine. The risk scales up with concentration. If you’re reaching for sage in any form beyond a cooking spice, the safety data simply isn’t there to support it during pregnancy.