Which plants to absolutely avoid, which are compatible, and in which cases. A complete and cautious guide to safely navigate pregnancy.
Pregnancy radically changes the benefit/risk ratio of any ingested substance. Many plants traditionally considered « gentle » are in fact contraindicated: they may cause uterine contractions, cross the placental barrier, or disrupt embryonic development.
This guide reviews the plants to absolutely avoid, those requiring caution, and the rare ones that remain usable — always after the advice of a health professional.
This list is not exhaustive. In doubt, abstain.
At usual culinary doses, without prolonged courses:
Several clinical trials (Cochrane, 2014) confirm efficacy against pregnancy nausea at a reasonable dose (1 g/day of powder, about 4 cups of light infusion).
Often considered acceptable as occasional infusion (1 cup/day) to soothe difficult digestion or promote sleep. Avoid essential oils and concentrated extracts.
Calming, digestive, generally tolerated as occasional infusion. As with chamomile, avoid concentrated forms.
Traditionally used by Anglo-Saxon midwives from the 8th month to prepare the uterus for childbirth (uterine tonic). Start only with your practitioner's explicit agreement.
Breastfeeding imposes the same caution: many plants pass into milk. Avoid sage (reduces lactation), peppermint and high-dose parsley for the same reason. Fennel, goat's rue and fenugreek are conversely used as galactagogues — always with professional support.
Tea contains theine (equivalent caffeine). WHO recommends limiting to 200-300 mg of caffeine per day during pregnancy, i.e. 2-3 cups of light tea maximum.
Always read the composition. Some contain raspberry leaf or sage inappropriate in early pregnancy. In doubt, ask your pharmacist.
Except for rare exceptions under midwife-aromatherapist supervision, avoid essential oils during the first trimester, and strongly limit their use throughout the rest of pregnancy.