The neem tree started in India and is spread around the world now. It is highly regarded in India as a medicinal plant. All parts of the neem plant can be used, although the seeds, bark and leaves are most commonly used. The seeds are made up of at least 50% oil. Neem oil is widely used as an insecticides, especially to organic farmers. Neem can be used as bug repellent, much safer than DEET. The oil has many uses, for one, it is used in making soaps, shampoo, lotions and creams.
The seeds contain the highest concentration of active substances in the neem plant. BUT the seed oil can be toxic and shouldn’t be taken internally.
The leaves of the neem tree contains less active ingredients than the seeds and the leaves are available year round as the tree is an evergreen. Its easy to make your own home remedies from the leaves.
Leaf pastes and extracts are used in skin care products, hair oils, in neem toothpaste and mouth washs.
Many people chew the leaves, take capsules of dried leaf, or drink the bitter tea. The leaves cleanse the blood, help ulcers, support the liver, and strengthen the immune system. These are some of the most popular uses. Neem is a very powerful herb and you should consult a herbalist or natureopath before using, and it should not be taken internally for long periods of time.
But topical use of neem leaf extracts is safe and used as a skin care works very well. It is effective to treat warts, cold sores, inflammation, eliminate bacterial and fungal infections. It moisturizes skin and can even lighten scars.
The bark of the neem tree is not as widely used because it is more difficult to use. It is difficult to extract ingredients because it is dry and hard. One of the uses of the bark is for gum disease. The active ingredients of the bark is used for an antiseptic and anti-inflammatory. Neem bark leaves contain Polysaccharides and liomnoids which are beneficial for alleviating cancer and tumor cells.
Other parts of the neem plant can be used for various things. For example the twigs are good for chewing and were used in India like a toothbrush to prevent cavities and gum disease. The pulp that is left after extracting the oil from the seeds is recommended for use as fertilizer. The flower smells like honey and the bees love the neem flowers and neem honey is made. The flower oil is used in aromatherapy and has a calming effect.
Other uses: the wood is considered an important source of firewood in some areas of Africa because of its rapid growth and it grows well with little water in poor soil. Another use is the neem tree being used for much, it can bring back acid soils to neutral and it improves the water holding capacity and nutritional value of the soil.
Finally, before using neem, you should research it and here is a link that gives you a lot of information on its uses and interactions with other medicinal properties: