Neem (Nimba) in Ayurveda
Neem (nimba) is widely used in Indian traditional medicine; here is what small trials show, why neem seed oil has poisoned infants, and what to ask before using it.
Content last updated . This page has not been medically reviewed.
Urgent safety note first
Neem seed oil (also called margosa oil) must never be given to babies or young children by mouth. Case reports describe vomiting, drowsiness, fast breathing and repeated seizures after infants were given small amounts, with some deaths and lasting nerve damage reported.[1] If a child may have swallowed neem oil or any herbal product and seems unwell, call 911 in the US or Poison Help at 1-800-222-1222 straight away. Other countries are listed on our Poison Help by country page, and the steps are in poisoning: what to do first.
What neem is
Neem is the tree Azadirachta indica, called nimba in Sanskrit. Different parts are used: leaves, bark, twigs and the oil pressed from seeds. Each is a different product with a different risk, so "neem" on a label does not tell you much on its own.
Traditional use
A pediatric report notes that margosa oil, from the seed of the neem tree, is widely used as a traditional medicine in India, Sri Lanka, Burma, Thailand, Malaysia and Indonesia, mainly for external use, though it is sometimes given by mouth to newborns and infants in small amounts.[1] For skin and hair products in general, see Ayurvedic skin and hair products. I did not read a classical text describing nimba's traditional properties, so none are stated here.
What research has measured
Most neem research is in cells, animals and test tubes. A 2022 review of neem and diabetes screened 2,784 studies and found that the laboratory work supports looking further, but its authors call for systematic evaluation of clinical efficacy and safety.[2] Human trials are few and small:
| Question | What the source found | Strength |
|---|---|---|
| Metabolic syndrome | A 12-week trial in 80 people (20 per group) tested three doses of an aqueous leaf and twig extract against placebo and reported improved blood sugar, insulin resistance and some inflammation markers.[3] The trial authors note clinical studies were lacking before. | Preliminary |
| Gum health | A crossover trial in 40 young adults found a 2% neem mouthwash and 0.2% chlorhexidine both lowered gum scores, with no significant difference in plaque between them.[4] | Preliminary |
| Preventing COVID-19 | A single-center pilot trial of 190 people in India gave a patented neem leaf extract or placebo for 28 days. Infections were few (13 in all), and the authors say it warrants further trials.[5] | Insufficient evidence |
None of these trials show that neem treats or prevents a disease. They are small, short, and often use proprietary extracts, so the result for one product does not carry over to another.
Frequently asked questions
Is neem oil safe for babies?
No. Margosa (neem seed) oil given by mouth to infants has caused toxic encephalopathy with seizures, and deaths and neurological damage have been reported.[1]
What is nimba?
Nimba is the Sanskrit name for neem, Azadirachta indica, a tree whose leaves, bark and seed oil are used in traditional medicine.[1]
Does neem lower blood sugar?
A 12-week trial in 80 people with metabolic syndrome reported improvements,[3] but reviews say the evidence needs systematic clinical testing before conclusions.[2]
Is neem mouthwash as good as chlorhexidine?
In one small crossover trial of 40 people, both mouthwashes reduced gum scores and plaque differences were not significant,[4] but one small study cannot settle the question.
Does neem prevent COVID-19?
A pilot trial of 190 people reported fewer infections with a neem extract, but it was small and the authors call for further trials.[5] It should not replace vaccination or standard advice.
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 and cautions
Neem seed oil by mouth: the infant poisoning above is the central risk. A review of neem toxicity notes that the safety of neem compounds is not always taken into consideration and few in vivo toxicity studies have been performed.[6]
Neem leaf extracts: the small trials above reported minimal side effects (the COVID-19 trial reported only mild events),[5] but they were short.
Pregnancy, breastfeeding and fertility: I searched PubMed for human data and did not find a source I could read that establishes safety. Proper evidence not found. Ask a clinician before using neem products in medicinal amounts; see pregnancy and breastfeeding safety.
Quality: some Ayurvedic preparations contain toxic amounts of lead, mercury or arsenic.[7] Read Ayurvedic products: heavy metals and product quality before buying any Ayurvedic-style product.
Medicines: if you take diabetes medicine, a herb that lowers blood sugar could add to it. I did not find a read source testing neem with specific drugs, so tell your pharmacist or doctor.
When to see a doctor first
Skin infections, lumps, wounds that do not heal, and high blood sugar need medical assessment. Do not use neem in place of prescribed treatment or on a baby's skin or mouth without medical advice.