Herbal remedies and supplements
Herbal remedies and dietary supplements are among the most widely used forms of natural health product, and among the most confusing. This overview explains what each term means, how they are regulated, and how to weigh the evidence for individual products.
Herbal medicine versus supplements
Herbal medicine uses whole plants or plant parts, often as teas, tinctures, or extracts, in doses intended to have a direct effect on the body. Dietary supplements are a broader category that includes vitamins, minerals, amino acids, and botanical extracts, usually sold as pills, capsules, or powders to supplement the diet rather than to treat disease.
The line between the two can blur in practice. A capsule of concentrated ginger extract, for example, might be marketed as a supplement while functioning like a herbal remedy in the dose it delivers.
How these products are regulated
In many countries, herbal products and supplements sit under food or supplement law rather than medicines law. This generally means manufacturers are responsible for the safety of their products and must not make false claims, but they are not typically required to prove effectiveness before a product reaches the shelf, unlike prescription medicines. Rules differ between countries, so it is worth understanding what applies where you live.
The NIH Office of Dietary Supplements (ODS) is a useful independent source for checking what is actually known about a given ingredient, separate from marketing material.
What the evidence looks like
Evidence quality varies enormously between individual herbs and supplements. Some, like certain vitamin and mineral supplements for a diagnosed deficiency, have solid evidence behind them. Others, particularly many botanical extracts sold for general wellness, have weak, mixed, or preliminary evidence, and some show no benefit beyond placebo in rigorous trials. Reading about a specific herb, like on our common herbal remedies page, or a supplement category, like our vitamins and supplements basics page, is more useful than treating "natural" as a single category with one answer.
Safety comes first
Natural does not mean risk-free. Herbs and supplements can cause side effects, vary in potency between brands, and interact with prescription medicines, sometimes seriously. St John's Wort, for example, is well documented to interact with a wide range of medications, including some antidepressants and oral contraceptives. Always disclose everything you take to your doctor or pharmacist.
Common questions
Are herbal remedies regulated the same way as medicines?
In most countries, herbal products and dietary supplements are regulated more like foods than medicines, meaning manufacturers generally do not need to prove effectiveness before selling them, though safety and manufacturing rules still apply. Requirements vary by country, so check local regulations.
Does natural mean safe?
No. Natural substances can still cause side effects, interact with prescription medicines, or be unsafe in certain doses, during pregnancy, or with certain health conditions. Always tell your healthcare provider about anything you take, including herbs and supplements.
Can I take herbal remedies alongside prescription medication?
Some herbs and supplements interact with prescription medicines, sometimes seriously. Always check with a pharmacist or doctor before combining them, particularly if you take blood thinners, antidepressants, or medication for chronic conditions.
How do I know if a supplement claim is trustworthy?
Look for information from independent bodies such as the NIH Office of Dietary Supplements or Cochrane reviews rather than marketing claims. Be cautious of language that promises to treat or cure a specific disease, since this is rarely supported by strong evidence.
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In short
Herbal remedies and supplements are not one thing, and blanket statements about them, either for or against, are rarely accurate. The honest approach is to look at the specific product, check what independent sources say, and involve a healthcare professional, especially if you take other medication.