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Neem in a Supplement: What MSK Says About Safety
Neem is a tree leaf used in Ayurvedic medicine, listed ninth on the Prostadine info page. Memorial Sloan Kettering reports a shortage of studies on both its safety and its effectiveness. Swallowing neem oil has caused severe poisoning, so any neem product deserves a pharmacist's check.
Written by the Prostadine label deskUpdated · 4 min read
The basics01
What is neem?
Neem comes from a tree native to India. Its leaves, bark, seeds and oil have been used in traditional medicine for centuries, and in toothpastes, soaps and garden products.
It is the last of nine ingredients on the Prostadine info page, and the least studied for the prostate. We found no human trial of neem for urinary or prostate symptoms.
It has a reputation as a general cleanser, which explains why it sits in a mixed formula. Reputation is not evidence, and the sources are plain about that.
The evidence02
What does MSK say?
Memorial Sloan Kettering states that neem has been used in traditional and Ayurvedic medicine, but studies on safety and effectiveness are lacking (MSK, Neem).
It also notes that swallowing neem oil has caused severe poisoning in children and adults, with seizures, coma and some deaths. Rare oral case reports describe vomiting, drowsiness, diarrhea, vision loss and nervous system toxicity (MSK, Neem).
Neem oil and neem leaf are different products. We do not know which form, if any oil, the formula uses, and the label does not say. That is a question for the seller.
The numbers03
What the cautions look like
| Report | Detail |
|---|---|
| Effectiveness studies | Lacking |
| Neem oil swallowed | Severe poisoning with seizures, coma, deaths |
| Rare oral reports | Vomiting, drowsiness, diarrhea, vision loss |
| Lab data on enzymes | Inhibited CYP3A4/5, CYP2C8 and CYP2C9; effect in people unknown |
All entries are from MSK (MSK, Neem). The enzyme finding was in the lab, not in people, so its importance is uncertain.
The catch04
Why do enzymes matter?
Those enzymes, in the liver, break down many common medicines. If a substance slows them, a drug can build up. In a dish, neem extract slowed them. Whether that happens at the dose in a supplement is not known (MSK, Neem).
It is a reason to ask a pharmacist if you take several daily medicines, especially ones with narrow safety margins such as some blood thinners and heart drugs.
Safety05
Why is traditional use not enough?
Traditional use tells us a plant has been tried for a long time, and that is worth something. It does not say how many people were hurt, how much they took or whether the plant worked better than rest and time. Records of harm are rarely kept in folk practice, while records of success are retold.
Neem shows the gap well. Leaves and twigs have been chewed for generations, and yet MSK reports that concentrated oil has caused severe poisoning, especially in children (MSK, Neem). The risk lives in the form and the dose, which is the thing a supplement label should state.
That is why the information we ask for is so basic: plant part, form and amount. Without them, history is a comfort and not a guide.
What to do06
Who should be most careful?
Children, pregnant and nursing women, people with liver or kidney disease and anyone on several medicines should ask a clinician before using neem. Traditional use is not a safety record, and oil in particular should not be swallowed.
Neem oil poisoning has caused seizures and deaths. If you suspect any exposure, seek urgent medical care.
On the label07
What it means for the drops
Neem is last in the list, so the blend rules say it cannot be a large share. That limits the risk but does not remove the question, since the real amount is unknown. See the neem page for the profile and the side effects page for the wider list.
If neem is a concern, ask the seller for the plant part, the form and the amount, and leave the bottle on the shelf until you have an answer.
FAQ08
Prostadine questions people ask
Is neem safe to take by mouth?
MSK says studies on safety and effectiveness are lacking. Neem oil has caused severe poisoning, so ask a pharmacist before taking any neem product.
Does neem help the prostate?
No trial we hold tests it for prostate or urinary symptoms. It is a traditional herb with little human research.
Is neem oil the same as neem leaf extract?
No. Oil has caused poisoning when swallowed. Leaf extract is a different product. The Prostadine label does not say which form is used.
Does neem affect how medicines are processed?
In lab tests, neem extract slowed liver enzymes that process many drugs. The effect in people is unknown, so ask your pharmacist if you take several medicines.
Who wrote this09
Written and reviewed by
Pages built from the bottle photos, the info page and linked NIH, FDA, NCI, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a licensed U.S. retail desk for Prostadine, not by the manufacturer. We earn money when you buy through our order links.
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