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    Herbal Teas to Avoid When Trying to Conceive: Complete Guide

    By Kelly Northey, Certified Postpartum Nutrition Professional
    Founder of Nella Vosk • 14+ years supporting families across motherhood, feeding, and early childhood wellbeing
    Editorial Policy →

    Herbal Teas to Avoid When Trying to Conceive: Complete Guide

    This article is part of the Nella Vosk Fertility Nutrition & Natural Conception Support: Complete Guide for Australian Couples — the comprehensive preconception resource for Australian couples. This article addresses the safety side of herbal tea use when trying to conceive — which herbs to avoid, why, and how to navigate the specific challenges of the preconception period.

    Herbal teas are often thought of as inherently safe — natural, gentle, and largely harmless. In most contexts and for most herbs, this is a reasonable assumption. But the trying-to-conceive period introduces a complication that changes the risk calculus considerably: the two-week wait.

    Between ovulation and your next expected period, you may be pregnant without knowing it. Neural tube development begins in the first 3–4 weeks of pregnancy — often before a positive test. This means that herbs which are unsafe in early pregnancy present a real concern not just after conception, but during the cycles in which you are actively trying. If you are drinking a tea that is contraindicated in the first trimester, and you are in the two-week wait, you may be exposing an early pregnancy to that herb.

    This article gives you a clear, tiered guide to the herbal teas most relevant to this concern — organised by the level of risk — along with the reason each herb warrants caution and safe alternatives you can enjoy with confidence.

    At Nella Vosk, the Maternal Wellness Support pathway is built on guidance that keeps both partners genuinely safe — including being direct about what to avoid, not just what to include.

    The Two-Week Wait Problem: Why Preconception Safety Is Different

    When you are trying to conceive, the period from ovulation to your next period (approximately 10–16 days, depending on your luteal phase) is a window of uncertainty. You may or may not be pregnant. You do not yet know.

    This creates a specific category of risk that does not exist in other life stages: herbs that are entirely safe when you are definitively not pregnant, but potentially harmful in early pregnancy, should be used with caution during any cycle in which you are trying to conceive — because during the luteal phase of that cycle, you may already be pregnant.

    Some practitioners take a more relaxed view of this (reasoning that the luteal phase, before implantation, is lower risk than post-implantation). Others recommend the more conservative approach: if an herb is not appropriate in the first trimester, consider avoiding it during any cycle where you are actively trying. This conservative standard is the basis for this article’s guidance, and it is the approach most consistent with the precautionary principle in reproductive medicine.

    Tier 1: Absolute Avoids — Herbs with Significant Safety Concerns

    These herbs have well-documented abortifacient (miscarriage-inducing), uterotonic (uterine stimulating), or fetotoxic properties. They should not be consumed when trying to conceive, and are never appropriate in pregnancy.

    Pennyroyal (Mentha pulegium)

    Pennyroyal has a long documented history of use as an abortifacient in traditional herbal medicine — used specifically to induce miscarriage and bring on delayed menstruation. The mechanism is uterine stimulation through its active compound pulegone. Even small amounts of pennyroyal essential oil can be toxic, and pennyroyal tea can cause liver and kidney damage at higher doses. There is no safe amount of pennyroyal when trying to conceive or during pregnancy. If you encounter a herbal blend that lists pennyroyal as an ingredient, do not use it during this period.

    Blue cohosh (Caulophyllum thalictroides)

    Blue cohosh has been used historically to induce labour and stimulate uterine contractions. It contains compounds (caulosaponin and caulophyllosaponin) that directly stimulate uterine muscle contraction. There are documented case reports of adverse neonatal outcomes associated with maternal blue cohosh use, including heart complications. Blue cohosh is considered unsafe at all stages of pregnancy and during the trying-to-conceive period. It should be avoided entirely.

    Mugwort (Artemisia vulgaris)

    Mugwort is an emmenagogue — a substance that promotes or stimulates menstrual flow. This mechanism makes it potentially abortifacient. Mugwort is used in traditional Chinese medicine in specific therapeutic contexts, but general supplementation or herbal tea use is not appropriate when trying to conceive or during pregnancy. It appears occasionally in herbal blends marketed for women’s health; check ingredient lists carefully.

    Tansy (Tanacetum vulgare)

    Tansy has documented abortifacient properties and was historically used to induce miscarriage. It is toxic in higher doses and has no place in any herbal tea blend intended for women of reproductive age who may be pregnant or trying to conceive.

    Rue (Ruta graveolens)

    Rue is another herb with well-documented emmenagogue and abortifacient properties, used historically to stimulate menstruation and induce early pregnancy loss. It is not appropriate during the preconception period and should be avoided in any herbal blend during this time.

    Tier 2: Clear Avoids — Herbs with Uterine Stimulant or Significant Hormonal Effects

    These herbs have documented uterine-stimulating properties, significant hormonal interference, or other effects that make their use inadvisable when trying to conceive — particularly during the two-week wait.

    Sage (Salvia officinalis) in medicinal amounts

    Culinary amounts of sage in cooking are safe. However, sage tea — consumed as a medicinal infusion — contains thujone, a compound that can stimulate uterine contractions. Sage has been used traditionally as a galactagogue-antagonist (to reduce milk supply) and as an emmenagogue. Sage tea should be avoided when trying to conceive. Note that dried sage added to food in typical culinary quantities is not a concern — this refers specifically to sage as a primary tea ingredient.

    Parsley (Petroselinum crispum) in medicinal doses

    Another case where culinary use is fine but medicinal use is not. Parsley contains myristicin and apiol, which stimulate uterine muscle and have historically been used as emmenagogues. Parsley garnish on a meal is completely unproblematic. However, parsley tea, parsley seed oil, or parsley consumed in large medicinal quantities has documented uterine-stimulating effects and should be avoided during trying to conceive cycles.

    Ginkgo biloba (Ginkgo biloba)

    Ginkgo contains compounds (ginkgolides) that can thin the blood and interfere with platelet function. Beyond this, a study found that high concentrations of ginkgo negatively affected both immature eggs and sperm function in laboratory conditions. It also has minimal established safety data in pregnancy. Ginkgo biloba tea should be avoided when trying to conceive.

    Echinacea (Echinacea purpurea) in high amounts

    Echinacea is widely used as an immune herb, particularly for cold prevention and management. However, research has found that high concentrations of echinacea compounds were damaging to immature eggs and sperm in laboratory studies. A single dose at typical amounts is unlikely to cause meaningful harm, but regular daily use — as you might do with an herbal tea blend — during the preconception period warrants caution. Echinacea should be avoided as a daily tea component when trying to conceive; occasional use at low doses during illness is generally considered less concerning but discuss with your GP if you rely on it regularly.

    St. John’s Wort (Hypericum perforatum)

    St. John’s Wort is not primarily a fertility concern because of uterine stimulation, but because of its significant drug interactions. It is a potent inducer of cytochrome P450 enzymes in the liver, which affects the metabolism of many medications, including hormonal contraceptives (which is why it is known to reduce the effectiveness of the pill), certain antidepressants, anticoagulants, and fertility medications. If you are taking any prescription medication and a tea blend contains St. John’s Wort, discuss with your GP before consuming. It should not be used alongside any fertility medications, including clomiphene or letrozole.

    Yarrow (Achillea millefolium)

    Yarrow has emmenagogue properties — it promotes menstrual flow — and is contraindicated during pregnancy. It appears in some herbal wellness blends. Avoid it during the trying-to-conceive period.

    Tier 3: Use with Caution — Context and Dose-Dependent

    These are herbs where the concern is more dose-dependent, context-specific, or related to interactions rather than direct abortifacient or uterotonic effects. Most are fine in typical culinary or low-dose contexts; the concern arises at higher or medicinal doses.

    High caffeine teas (black, strong green, and oolong)

    Caffeine is not an herb in the traditional sense, but it is the most universally relevant concern in herbal tea safety for trying to conceive. Preconception and pregnancy guidelines recommend limiting caffeine to under 200mg per day. High-caffeine teas — strong black tea, robust green tea, oolong — each contain 30–70mg of caffeine per cup. Across a day that includes coffee, these can easily push total caffeine over recommended limits.

    Elevated caffeine intake (above 200–300mg per day) has been associated in some studies with longer time to conception and increased miscarriage risk. This is not a reason to panic if you enjoy one or two cups of black tea per day — it is a reason to be aware of your total daily caffeine across all sources and to choose predominantly caffeine-free herbal options for your preconception tea routine.

    Goldenseal (Hydrastis canadensis)

    Goldenseal contains berberine, which has genuine evidence for improving insulin sensitivity and metabolic function — relevant for some women with PCOS. However, berberine has also been shown to promote uterine contractions and is considered contraindicated in pregnancy. The concern for trying to conceive is specifically the two-week wait: if you are taking goldenseal or berberine in the cycles where you are attempting conception, you may be exposing an early pregnancy to a compound that could affect implantation or early development. If berberine is part of your PCOS management, discuss the appropriate timing to pause it with your GP, particularly around your luteal phase.

    Licorice root (Glycyrrhiza glabra) in large amounts

    Licorice root in small amounts in a herbal blend is generally considered safe. However, in larger medicinal amounts, glycyrrhizin — the active compound in licorice root — can affect cortisol levels, blood pressure, and in high doses has been associated with adverse pregnancy outcomes in some studies. Occasional consumption in a small amount as part of a blend is different from consuming licorice root tea daily in significant quantities. Check the proportion in any blend you are using.

    Detox and cleansing tea blends

    This entire category deserves specific attention. “Detox” and “cleansing” herbal tea blends are popular wellness products that frequently appear in health stores and online. Many of these contain senna, cascara sagrada, rhubarb root, or other laxative herbs — compounds that stimulate bowel contractions, and in some cases uterine contractions, through overlapping smooth muscle mechanisms.

    Senna and cascara in particular should be specifically avoided when trying to conceive. Both are laxative compounds with well-documented bowel-stimulating effects and potential for uterine stimulation at higher doses. Several sources specifically list senna as an herb to avoid during preconception and pregnancy.

    The broader category issue: detox blends often contain a mix of herbs that individually may have limited documentation but collectively may present a more complex safety profile. The general guidance is that if a tea is marketed for “cleansing,” “detoxifying,” or “flushing” the body, it is not the right tea for the preconception period.

    What About Common Kitchen Herbs in Tea?

    A question that often comes up: are teas made from common herbs like ginger, peppermint, chamomile, or rooibos safe when trying to conceive?

    Ginger tea

    Ginger in typical culinary amounts — a slice of fresh ginger in hot water, a standard ginger teabag — is considered safe and is commonly recommended for nausea relief in pregnancy. At very high medicinal doses, some traditional herbal medicine perspectives note emmenagogue effects, and some animal studies at high doses have found effects on embryonic development. At typical tea-preparation doses for ginger tea, this is not a meaningful concern for most women. Stick to one to two cups per day and avoid highly concentrated ginger extracts or supplements at medicinal doses.

    Peppermint tea

    Peppermint tea in normal amounts (1–2 cups per day) is considered safe during preconception. Very large amounts of peppermint may have mild emmenagogue effects in theory, but this is at concentrations far beyond typical tea consumption. Peppermint tea at normal doses is a safe, pleasant caffeine-free option for the preconception period.

    Chamomile tea

    Chamomile is generally considered safe in the preconception period in typical amounts. Some very conservative sources advise caution due to theoretical coumarin-related effects, but this is at levels far beyond normal tea consumption. One to two cups of standard chamomile tea per day is broadly considered safe.

    Rooibos tea

    Rooibos is caffeine-free, antioxidant-rich, and has no documented uterine-stimulating or abortifacient properties. It is one of the most consistently recommended teas across preconception and pregnancy due to its safety profile and antioxidant content. Drink freely.

    Raspberry leaf tea

    Standard quantities of red raspberry leaf during the preconception period are considered appropriate by most practitioners. The uterine-stimulating concerns are primarily flagged for the first trimester of confirmed pregnancy, not for the preconception period itself. See our dedicated article on raspberry leaf tea for fertility for a full evidence review.

    The Blended Product Problem: How to Read a Label

    One practical challenge in the Australian herbal tea market is that many wellness teas contain multiple herbs in a blend, with the individual herb quantities not always disclosed. This makes it difficult to know how much of any given herb you are actually consuming.

    When assessing a blend for preconception safety:

    • Read the full ingredient list: not just the front label. Every ingredient should be identifiable, and if any appears on the lists above, the blend is not appropriate for the preconception period
    • Check the order: ingredients are listed in descending order of quantity in Australian food products. An herb that appears last on a long list is present in smaller amounts than one that appears second or third
    • Be wary of “proprietary blend” labelling: blends that hide individual herb quantities behind a proprietary blend declaration make it impossible to assess dose. Quality preconception products should disclose their ingredients transparently
    • If in doubt, contact the manufacturer: reputable brands will be able to confirm ingredient quantities. If a brand is unwilling or unable to do this, that is useful information about their product quality and transparency
    • Avoid the “women’s wellness” category without scrutiny: many general women’s wellness teas are formulated without specific preconception safety in mind. A tea that is appropriate for a 45-year-old managing menopausal symptoms may contain herbs that are not appropriate when trying to conceive
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    Frequently Asked Questions

    Yes, many herbal teas are safe and genuinely beneficial during the preconception period. Red raspberry leaf, nettle leaf, spearmint, rooibos, ginger, chamomile, and purpose-formulated fertility teas containing Vitex, shatavari, and similar herbs are appropriate choices. The herbs to avoid are a specific subset, and there are clear, enjoyable alternatives for each of them. The goal is not to avoid all herbal teas — it is to avoid the specific herbs documented to have uterine-stimulating, abortifacient, or significant drug-interaction effects.

    For the full guide to fertility-supportive herbs and how to choose quality blends, see our complete guide to the best fertility teas in Australia.

    One or two cups of sage tea, particularly early in a pregnancy, is unlikely to have caused significant harm. The concerns about sage and uterine stimulation are primarily associated with regular medicinal use, not occasional culinary or tea consumption. Do tell your GP at your first antenatal appointment about any herbal teas you consumed before knowing you were pregnant — they can offer specific reassurance based on what you took and at what point in the pregnancy.

    Try not to catastrophise, but do stop any herb on the caution or avoid lists as soon as you receive a positive test.

    This depends on which herb and what tier it is in. If it is a Tier 1 herb (pennyroyal, blue cohosh, mugwort, tansy, rue), stop immediately and choose a different blend. If it is a Tier 2 herb (sage, ginkgo, St. John’s Wort), the same applies. If it is a Tier 3 herb (goldenseal, high licorice amounts), the timing and dose matter more — discuss with your GP or a naturopath experienced in preconception care.

    If the herb is in a detox/cleansing blend category, switch to a purpose-formulated fertility tea from a transparent brand.

    Purpose-formulated fertility teas from reputable Australian brands are generally formulated with preconception safety in mind and use ingredients appropriate for this phase. That said, quality and transparency vary significantly in the Australian market. Look for brands that disclose full ingredient lists with amounts, that are formulated by qualified practitioners, and that specifically note which ingredients are pregnancy-safe and which should be stopped upon confirmed pregnancy.

    The Nella Vosk fertility tea range is formulated by a Certified Postpartum Nutrition Professional with specific preconception safety as a core consideration.

    Choose purpose-formulated fertility teas from transparent brands, or stick to the clearly safe options: rooibos, peppermint, chamomile, ginger (in normal amounts), and red raspberry leaf. Avoid the detox/cleansing category entirely. Keep caffeine from all tea sources under 200mg per day total.

    Read ingredient labels before trying any new blend. Stop and review all herbal teas with your GP or midwife as soon as you receive a positive pregnancy test — what is appropriate for preconception is not always appropriate for the first trimester.

    Safe Alternatives to Common Problem Herbs

    Instead of sage tea — try: red raspberry leaf. Similar pleasant flavour, nutritionally beneficial, appropriate for preconception

    Instead of detox/cleansing blends — try: lemon and ginger tea, or rooibos. Both support wellbeing without the laxative and uterine-stimulating herbs that detox blends typically contain

    Instead of high-caffeine black or oolong tea — try: rooibos (caffeine-free), peppermint, chamomile, or purpose-formulated fertility tea blends (all caffeine-free)

    Instead of echinacea tea for immune support — try: elderflower or elderberry tea, which have immune-supporting properties with a safer preconception profile

    Instead of St. John’s Wort for mood support — try: lemon balm tea, which has gentle calming effects without St. John’s Wort’s significant drug interaction profile. Discuss mood support with your GP if it is a significant concern — they can recommend approaches that are compatible with your other medications and the trying-to-conceive period.

    Next Steps

    For the complete preconception herbal support guide — covering which herbs are most beneficial and why — return to the Fertility Nutrition & Natural Conception Support: Complete Guide.

    → Also in this cluster: best fertility teas in Australia: complete guide — quality blends that are safe and supportive for the preconception period

    → raspberry leaf tea for fertility: what the research says — a safe and nutritionally valuable preconception herb, evidence reviewed honestly

    → nettle tea for conception: benefits and how to use — one of the most nutritionally valuable preconception herbs, with safety profile explained

    → shatavari for fertility: traditional herb, modern science — an adaptogenic herb with a good preconception safety profile, evidence and safety reviewed.
    About the Author

    Written by Kelly Northey, Certified Postpartum Nutrition Professional (CPPNP) and founder of Nella Vosk.

    With specialised training in preconception and postpartum nutrition, Kelly helps Australian women navigate herbal fertility support safely and effectively — including the safety side that too many brands gloss over.