Neem Oil is obtained from the cold pressing of the fruit seeds of the Azadirachta Indica tree, a tropical evergreen that is native to India. It is very drought tolerant and as a result is considered a weed in many parts of the world.
The chart below shows the approximate percentages of fatty acids present in Neem Oil. As you can see, the palmitic and stearic acid will lend your soap a decent amount of hardness and stable lather. The remaining majority of the acids present will lend the soap a conditioning quality due to the high percentage of oleic and linoleic.
This information is provided for reference use only and is not meant to substitute the advice of a licensed health care professional.