Neem oil is pressed from the seeds of the neem tree. It is used as a natural insecticide in gardening, as a treatment for head lice and scabies, and in skin and hair care for acne, dandruff and fungal problems. It must never be swallowed, and it is dangerous for children.
What is Neem Oil?
Neem oil is pressed from the seeds of Azadirachta indica, a tree native to India and now widespread across Africa and Asia. It is dark yellow to brown, thick, and has a strong, distinctly unpleasant garlic-and-sulphur smell that people either tolerate or do not.
It is sold as a herbal, cosmetic and horticultural product, not a registered medicine, so it does not appear in the South African Medicine Price Registry.
The main active constituent is azadirachtin, an insect growth regulator that disrupts feeding, moulting and reproduction in insects. Neem also contains nimbin, nimbidin and various fatty acids with antifungal and anti-inflammatory activity in laboratory testing.
Cold-pressed neem oil retains azadirachtin; refined or heat-processed oil largely does not. If you want the insecticidal effect, cold-pressed is what you need, and the label should say so.
Neem oil and neem leaf are not the same. Leaf preparations — teas, powders, capsules — are taken internally in some traditional systems. Neem seed oil is not and is considerably more toxic. That distinction is the single most important thing on this page.
What is Neem Oil commonly used for?
Horticultural and pest control — its largest use worldwide:
- Organic insecticide for aphids, whitefly, mealybug, spider mites and scale.
- Fungicide for powdery mildew and other plant fungal problems.
- Household insect deterrent.
On skin and hair:
- Head lice, where it has some evidence and is used in several commercial preparations.
- Scabies, traditionally and with some study support.
- Acne, for its antibacterial and anti-inflammatory activity.
- Fungal skin problems, including athlete’s foot and ringworm.
- Dandruff and scalp conditions.
- Eczema and psoriasis, traditionally, for the soothing effect.
- Insect repellent on skin, diluted.
- Pet care, for fleas and mange — though it must not be used on cats, which are highly sensitive.
Traditionally taken internally in some systems for fever, diabetes and parasites — and this is where the harm occurs. The evidence for internal use is weak, and the risk is not.
What it does not reliably do: replace an antifungal for an established fungal infection, replace a scabicide such as permethrin for confirmed scabies, or treat acne as effectively as proven treatments. It is a reasonable adjunct and a poor substitute.
Who commonly looks for Neem Oil and why
- Gardeners, wanting an organic pesticide — probably the largest group.
- Parents dealing with head lice, particularly after resistant infestations.
- People with acne, looking for a natural option.
- People with dandruff or scalp problems.
- People with fungal skin infections.
- Pet owners, for fleas and skin problems.
- People from South Asian or East African communities, where neem has long household use.
- People considering taking it internally — for whom the safety section below is the reason this page exists.
What to check on the label before taking Neem Oil
- Cold-pressed or refined, and whether azadirachtin content is stated.
- Whether it is intended for skin, horticultural or veterinary use. Horticultural products may contain additional pesticides or emulsifiers not meant for skin.
- Whether it is pure oil or already diluted.
- Whether it is neem seed oil or a neem leaf product — very different things.
- The manufacturer, with a contactable distributor.
- Any warning about internal use, which a responsible product will carry.
Using it on skin:
- Always dilute it. Typically 1–2% in a carrier oil such as coconut, olive or jojoba — a few drops per tablespoon. Undiluted neem oil irritates skin.
- Patch test and wait 24 hours before wider use.
- Do not apply it to broken, cracked or infected skin.
- Keep it away from the eyes, mouth and mucous membranes.
- Do not use it on babies or young children, and never on the face of a small child.
- Store it sealed and cool. It solidifies below about 20°C — warm the bottle in your hands rather than heating it strongly.
Safety, interactions and when to seek professional advice
Neem oil must never be swallowed, and this is not a cautious formality.
Neem seed oil ingestion has caused serious poisoning and deaths in infants and young children, at quantities as small as a few millilitres. The syndrome — sometimes called Reye-like syndrome — involves vomiting, drowsiness, seizures, metabolic acidosis, liver injury, brain swelling and coma, and it can develop within hours.
Cases are well documented in India and elsewhere, typically where neem oil was given to an infant as a traditional remedy. Do not give neem oil to a child by mouth under any circumstances, and store it locked away — the bottle looks like cooking oil.
Get emergency help immediately if anyone, especially a child, swallows neem oil. Take the bottle with you, and do not try to make them vomit.
Speak to a doctor or pharmacist before using it if you:
- Are pregnant or trying to conceive. Avoid it entirely — neem has documented antifertility effects and has traditionally been used to cause abortion. This applies to internal use in particular, and caution is warranted with heavy topical use.
- Are breastfeeding, or using it anywhere a baby might contact.
- Have diabetes — neem may lower blood sugar, and combined with medication that risks hypoglycaemia.
- Take immunosuppressants, or have an autoimmune condition.
- Have liver or kidney disease.
- Are due for surgery.
- Are treating an infant or small child in any form.
On skin, reported effects include irritation, redness, burning and allergic contact dermatitis — more likely undiluted.
Get emergency help for swelling of the face, lips or tongue, difficulty breathing, or a widespread rash.
See a doctor rather than self-treating if:
- Head lice or scabies are confirmed or suspected — permethrin and ivermectin are the treatments with proper evidence, and scabies needs whole-household treatment.
- Acne is moderate or severe or scarring — proper treatment prevents permanent scarring.
- A fungal infection is not clearing, or involves nails or scalp.
- A rash is spreading, weeping, crusted or painful, or comes with fever.
- You have diabetes and are using it regularly.
Related supplement guides
Frequently asked questions
What is neem oil used for? As an organic garden insecticide and fungicide, for head lice and scabies, and in skin and hair care for acne, dandruff and fungal problems.
Can I swallow it? No. Neem seed oil has caused serious poisoning and deaths in infants at very small quantities. Never give it to a child by mouth, and keep it locked away.
What if a child swallows some? Get emergency help immediately, take the bottle with you, and do not induce vomiting.
Do I need to dilute it for skin? Yes — typically 1–2% in a carrier oil. Undiluted neem oil irritates skin.
Does it treat head lice? It has some evidence and appears in commercial preparations. For confirmed infestation, treatments with proper evidence work more reliably.
Can I use it in pregnancy? No. Neem has documented antifertility effects and has traditionally been used to cause abortion. Avoid it.
Is neem leaf the same as neem oil? No. Leaf preparations are taken internally in some traditions; neem seed oil is not and is considerably more toxic.
Why does it smell so bad? The sulphur compounds in it. Refined oil smells milder but contains less of the active azadirachtin.