Neem has been used as an insecticide, insect repellent, and oral dentifrice, and in traditional medicine to treat malaria, diabetes, worms, and cardiovascular and skin diseases. It reportedly has contraceptive, antiulcer, and fungicidal properties, as well as applications relevant to cancer.
Is neem toxic to humans?
 In children, neem oil is reported to cause toxic encephalopathy and Reye’s–like syndrome.  We report a case of neem oil poisoning in a 73-year-old male who presented with vomiting, seizures, metabolic acidosis, and toxic encephalopathy.
What insects will neem oil control?
As an insecticide Neem kills small soft-bodied insects like Aphids, Mealybugs, Mites, Thrips and Whiteflies on contact. Spraying Neem Oil as a knockdown followed by releases of generalist beneficial insects, like Green Lacewing, is a good way to minimize pest populations that are already present in the growing area.
What are the three uses of neem?
People use neem for lice, tooth plaque, gingivitis, psoriasis, to repel insects, and for many other purposes, but there is no good scientific evidence to support most of these uses. There is also no good evidence to support using neem for COVID-19. Neem seed oil is used as a pesticide.