A tea recommended by a friend, a capsule from the chemist, or a traditional formula prescribed for a specific concern can all be described as “herbal”. Yet they are not interchangeable. Are herbs safe? Often, they can be used safely when the product, dose and person are considered carefully. But “natural” does not automatically mean harmless, suitable for everyone, or safe to combine with medicines.
Herbal medicine deserves the same thoughtful approach as any other health treatment. The right questions are not only “What is this herb used for?” but also “Is this the right preparation for me, at this stage of life, alongside my current care?”
Are herbs safe for everyone?
No single answer applies to every herb or every person. Safety depends on the exact botanical ingredient, the part of the plant used, the preparation, the dose, how long it is taken, product quality, and an individual’s health history. A concentrated extract in a tablet may act very differently from a culinary herb used in food or a mild infusion.
Herbs can cause side effects, including digestive upset, headache, skin reactions or changes in sleep. Some may affect blood clotting, blood glucose, blood pressure, liver metabolism or the way prescription medicines are processed. Risk can also rise when several supplements are combined, when a product is taken in higher doses than directed, or when an unclear online product is used for a long period.
This does not mean herbal medicine has no place in care. It means it should be prescribed and monitored with the same respect given to its potential benefits. In Chinese medicine, herbal prescribing is traditionally individualised. Two people with the same label, such as poor sleep or period pain, may have different patterns, contributing factors and treatment needs. A formula that suits one person may not suit another.
Product quality matters as much as the herb
A product’s label is not always a complete guarantee of what is inside it. International reviews have identified concerns with some herbal products, including substitution with another plant species, contamination with heavy metals or pesticides, undeclared pharmaceutical ingredients, and variable strength between batches. These problems are more likely with products from uncertain sources or those making dramatic claims.
In Australia, therapeutic goods are regulated by the Therapeutic Goods Administration (TGA). Many lower-risk complementary medicines are “listed” on the Australian Register of Therapeutic Goods. Their sponsors must meet requirements for quality and safety, while claims must be supported by evidence held by the sponsor. Listed status does not mean every product has been independently assessed for effectiveness before sale. Higher-risk products may be “registered” and undergo more detailed evaluation.
For this reason, choose products from reputable Australian suppliers, follow the labelled dose unless your qualified practitioner has advised otherwise, and avoid products with vague ingredient lists. Be particularly cautious of products marketed as rapid cures, “detoxes”, hormone fixes or guaranteed weight-loss solutions. Strong marketing is not a substitute for safe prescribing.
Medicines and herbs can interact
One of the most useful safety conversations is also one that is easily missed: what else are you taking?
Herbs and supplements may interact with prescribed medicines, over-the-counter treatments and other complementary products. St John’s wort is a well-known example. It can reduce the effectiveness of a range of medicines, including some antidepressants, oral contraceptives, anticoagulants, transplant medicines and antiviral treatments. Other herbs may increase sedation when combined with sleep medicines, or alter bleeding risk alongside anticoagulant or antiplatelet medication.
Interactions are not always obvious from how a person feels. A product may change how quickly the liver breaks down a medicine, making it less effective or increasing its concentration. This is why a full medicine and supplement list matters, including vitamins, protein powders, teas, powders and products only taken occasionally.
Do not stop a prescribed medicine because you would prefer to use herbs. Speak with the clinician who manages that medicine and with a qualified practitioner who can assess the combination. Coordinated care protects choice while reducing avoidable risk.
Tell your practitioner about these situations
Herbal safety needs closer consideration if you are pregnant, breastfeeding, trying to conceive, preparing for surgery, living with liver or kidney disease, or managing a complex medical condition. It is also especially relevant for babies, children, older adults and people taking several medicines.
Before surgery or dental procedures, advise your surgeon, dentist and anaesthetist about all herbs and supplements. Depending on the product and procedure, you may be asked to pause it beforehand. Do not make that decision alone, as timing and individual circumstances matter.
Pregnancy, postpartum and children require extra care
Pregnancy is a time when well-meaning advice can become confusing. A herb being traditionally used for nausea, sleep or labour preparation does not prove that it is appropriate for every pregnancy, dose or trimester. Research is limited for many herbal products in pregnancy and breastfeeding, while some substances may cross the placenta, affect uterine activity or pass into breast milk.
If you are pregnant or breastfeeding, seek advice from your midwife, GP, obstetric team, pharmacist or a suitably qualified Chinese medicine practitioner before starting a herbal product. Your care should account for your symptoms, pregnancy stage, medical history, scans and pathology where relevant, and any medicines you are already using.
The same principle applies to children. Children are not simply smaller adults, and dosing cannot safely be guessed by reducing an adult dose. Their developing bodies, lower body weight and the reason for the symptom all need careful assessment. Persistent fever, breathing difficulty, dehydration, severe pain, unusual drowsiness or a rapidly worsening illness requires timely medical care rather than self-treatment with herbs.
What a safe herbal consultation should look like
A careful consultation begins before a formula is selected. You should be asked about your main concerns, health history, diagnoses, allergies, pregnancy status, current medicines and supplements, and previous reactions to herbs. In Chinese medicine, this may be combined with traditional assessment methods such as observing the tongue, feeling the pulse and gentle palpation where appropriate and with consent.
Your practitioner should explain why a particular herb or formula is being considered, how to take it, what changes to look for, possible side effects, and when to stop and seek advice. You should also know whether the product is intended for short-term support or review over time. A plan can be adjusted as your symptoms, medications or circumstances change.
Informed consent is central. You can ask about the evidence for a recommendation, whether there are lower-risk alternatives, how the product is sourced, and what the plan is if it does not help. A responsible practitioner will welcome those questions and refer you to another health professional when needed.
When to stop and get help
Stop the product and seek urgent medical advice for signs of a serious reaction, such as trouble breathing, swelling of the face or throat, widespread hives, fainting, chest pain, severe vomiting, black or bloody stools, yellowing of the skin or eyes, or confusion. Report suspected adverse effects to your doctor, pharmacist or the TGA.
For milder new symptoms, such as a rash, nausea, diarrhoea, dizziness or palpitations, pause the product and contact the practitioner or pharmacist who advised it. Keep the packaging and a record of the dose, start date and other medicines taken. This information can make an assessment much clearer.
A practical way to make herbal care safer
The safest approach is usually the least complicated one. Start only one new product at a time where possible, use a clear dose from a reputable source, and arrange review rather than continuing indefinitely by default. Avoid sharing formulas with family or friends, even when their symptoms sound similar.
At Finer Point Acupuncture, herbal recommendations form part of an individual care discussion, not a one-size-fits-all solution. If you would like to understand whether Chinese herbal medicine may be appropriate for your circumstances, or make a booking, a consultation can provide the space to review your health history, current treatments and goals with care.
Selected evidence and regulatory sources
- Therapeutic Goods Administration. Australian regulation of complementary medicines and guidance on reporting adverse events.
- National Centre for Complementary and Integrative Health. Herbs at a glance and herb-drug interaction information.
- Posadzki P, Watson LK, Ernst E. Herb-drug interactions: an overview of systematic reviews. British Journal of Clinical Pharmacology. 2013.
- Ekor M. The growing use of herbal medicines: issues relating to adverse reactions and challenges in monitoring safety. Frontiers in Pharmacology. 2014.
- Moreira DL, et al. Use of herbal medicines during pregnancy: a systematic review of safety evidence. Phytotherapy Research. 2014.