Updated 20 June 2026
Herbal supplements are concentrated products made from plants or fungi. They may draw on long histories of traditional use, but traditional use, laboratory research and reliable clinical evidence are not the same thing. Evidence can also vary between extracts, powders, doses and product formulations.
“Natural” is not the same as risk-free
Herbal products contain biologically active compounds. That is why dose, formulation, interactions and personal circumstances matter. Some products may cause side effects, interact with medicines or be unsuitable during pregnancy, breastfeeding, before surgery or for particular health conditions.
Use the product label as the primary guide and discuss the ingredient with a qualified health professional when it may affect your care.
How to interpret evidence
When reading a benefit claim, ask:
- Was the research conducted in people or only in cells or animals?
- Was the ingredient form and amount similar to the product being sold?
- How many people took part, and for how long?
- Were the results consistent across more than one good-quality study?
- Does the conclusion describe a possibility, or does marketing turn it into a guarantee?
Research about one standardised extract cannot automatically be applied to every powder or capsule bearing the same plant name.
Examples: ashwagandha and turmeric
The US National Center for Complementary and Integrative Health (NCCIH) reports that some ashwagandha preparations have shown possible short-term benefits for stress or sleep, while evidence for many other promoted uses remains uncertain. It also notes important precautions and potential interactions. Read the NCCIH ashwagandha overview before considering an ashwagandha supplement.
Turmeric and curcumin products differ substantially in formulation and absorption. NCCIH describes the research as active but not conclusive for many promoted uses and notes that adverse effects and interactions are possible. See the NCCIH turmeric overview and compare the labels in our turmeric collection.
Quality checks that matter
- Look for a complete ingredient list and clear amounts per serving.
- Check warnings, allergens, expiry and storage instructions.
- Compare the ingredient form, not only the herb name.
- Be cautious of products promising to cure, prevent or rapidly transform health.
- Choose a pack size you can store and use according to the label.
You can browse related options in Herbal Supplements, including moringa, Triphala and Lion’s Mane.
When to ask for help
A pharmacist can help check interactions and duplicate ingredients. A GP can assess persistent symptoms or health conditions. An accredited practising dietitian can help determine whether food intake or a diagnosed deficiency should be addressed. Seek urgent care for a severe or rapidly worsening reaction.
Products you can compare
Related guides
Sources and further reading
- Therapeutic Goods Administration: Complementary medicines
- Healthdirect Australia: Vitamins, minerals and supplements
- US National Center for Complementary and Integrative Health: Using dietary supplements wisely
This article provides general information only and is not medical advice. Supplements should not replace a varied diet or professional healthcare. Speak with a qualified health professional before use if you are pregnant, breastfeeding, taking medication, preparing for surgery or managing a health condition.