Culinary Amounts vs Supplement Amounts of Herbs
Why a herb eaten as food is not the same as a herb supplement: worked comparisons for turmeric, garlic, chamomile and ginger from NCCIH, FDA and a liver-injury case series.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
Safety first. Eating a herb as a seasoning and swallowing it as a concentrated supplement are different exposures. For turmeric, NCCIH says highly bioavailable formulations of curcumin may harm the liver, and that fatigue, nausea, poor appetite, dark urine or jaundice are reasons to stop the product and talk to a health care provider. [1] Do not stop a prescribed medicine on your own; ask the prescriber or pharmacist. See Liver Injury Warning Signs.
How the sources frame the difference
- FDA says there are no laws or regulations that limit the serving size of a dietary supplement or the amount of a dietary ingredient in a serving. This is decided by the manufacturer and does not require FDA approval. [2]
- NCCIH says supplements you buy may differ in important ways from products tested in studies. [3]
- NCCIH repeatedly separates "amounts commonly found in food" from larger amounts, in pregnancy, breastfeeding and tea statements, as the table shows.
Worked comparisons
| Herb | In food or tea | As a supplement or concentrated form | What the evidence supports |
|---|---|---|---|
| Turmeric (Curcuma longa), rhizome | NCCIH: the rhizome has been used for culinary purposes; little is known about breastfeeding with amounts greater than those commonly found in food. [1] | Oral curcumin products vary in how much curcumin they contain and often contain substances such as piperine. [1] A US case series described 10 turmeric-associated liver injury cases, one of them fatal from acute liver failure. [4] | NCCIH does not know enough to conclude that turmeric or curcumin is beneficial for any health purpose. [1] Insufficient evidence |
| Garlic (Allium sativum), bulb | NCCIH: garlic has a long history of use in foods. [5] | Garlic supplements may reduce total and LDL cholesterol to a small extent in people with high cholesterol, and may increase bleeding risk. [5] Oral garlic in amounts greater than found in foods may not be safe in pregnancy or breastfeeding. [5] | Promising but limited for cholesterol. NCCIH says consuming garlic does not seem to reduce stomach cancer risk. [5] |
| Chamomile (Matricaria chamomilla), flower | NCCIH: likely safe orally in amounts commonly found in teas and other foods. [6] | A chamomile dietary supplement was studied for generalized anxiety; short-term medicinal use is "possibly safe." [6] | Preliminary for anxiety; very little on insomnia. [6] |
| Ginger (Zingiber officinale), rhizome | NCCIH: used in food and for health purposes. [7] | Most studies of ginger for nausea tested dietary supplements rather than foods. [7] | Pregnancy nausea: may be helpful, from mostly supplement studies. [7] |
What this means in practice
- A result found for one form does not carry to another. The ginger evidence for nausea comes mostly from supplements, so it does not show what food ginger does. [7]
- A food-use history is not a safety trial for supplements. NCCIH's garlic summary says oral garlic used safely in research studies lasted as long as 7 years, but also flags bleeding risk and pregnancy limits for supplements. [5]
- Added ingredients matter. In 3 of 7 turmeric products analyzed in the case series, piperine from black pepper was also present. [4]
- Proper evidence not found for a general rule that says "food amounts are always safe." The sources we read make herb-specific statements only, and we did not find a general rule in them.
Frequently asked questions
Is turmeric in curry the same as a turmeric supplement?
No. NCCIH says oral curcumin products vary in how much curcumin they contain, and highly bioavailable forms may harm the liver. [1]
Can garlic in food interact with blood thinners?
Proper evidence not found in the sources we read for food amounts. NCCIH's bleeding warning is about garlic supplements. [5] Ask a pharmacist.
Is chamomile tea safer than a chamomile supplement?
NCCIH says chamomile is likely safe orally in amounts commonly found in teas and other foods, and gives separate statements for medicinal use. [6]
Who decides how much is in a supplement?
FDA says the manufacturer decides the serving size and amount, and no law limits them. [2]
Does "natural" mean food-level amounts are fine for me?
No. NCCIH says "natural" does not always mean "safe." [3]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety groups
- Medicines: NCCIH says garlic supplements may increase bleeding risk with anticoagulants or aspirin, and chamomile interactions with warfarin and liver-metabolized drugs have been reported. [5][6] See How Interactions Work.
- Surgery: NCCIH says to tell providers about all supplements as far in advance of an operation as possible. [3]
- Pregnancy and breastfeeding: the garlic and turmeric statements above are about amounts greater than found in food. See Pregnancy and Breastfeeding.
- Allergy: NCCIH says chamomile allergy is more likely in people allergic to ragweed, chrysanthemums, marigolds or daisies. [6]
- Children: NHS says herbal medicines are not recommended for children because not enough is known about their safety. [8]
More background: Turmeric as a Food: Curry Spice vs Supplement, Garlic and Using Herbs: Studied Amounts and Questions for a Pharmacist.
References
- Turmeric, National Center for Complementary and Integrative Health (NCCIH), US, updated April 2025. Read 2026-10-23.
- Questions and Answers on Dietary Supplements, US Food and Drug Administration. Read 2026-10-23.
- Using Dietary Supplements Wisely, NCCIH, US. Read 2026-10-23.
- Halegoua-DeMarzio D, et al. Liver injury associated with turmeric: a growing problem. Ten cases from the Drug-Induced Liver Injury Network. American Journal of Medicine. 2023. Read 2026-10-23.
- Garlic, NCCIH, US. Read 2026-10-23.
- Chamomile, NCCIH, US. Read 2026-10-23.
- Ginger, NCCIH, US. Read 2026-10-23.
- Herbal medicines and complementary therapies, NHS (UK). Read 2026-10-23.