Moringa oleifera, AKA malungaay, has been traditionally used to treat a variety of ailments, but only recently has the science begun to catch up with the hearsay in the areas of breast and colon cancer, lung cancer, pancreatic cancer, diabetes, stroke, and myeloma. Granted, most of this evidence is in vitro, but we're getting there, and this is only a sampling of the available literature.
I've actually kept a moringa tree myself, in an effort to raise a source of it for personal consumption. Unfortunately, it's a tall spindly thing with relatively low leaf yield. The leaves themselves are ovals about a centimeter long, which makes them inefficient to grow and harvest. As a result, a large amount of cleared land and cheap labor are required to produce it economically.
Fortunately, an Indiegogo startup, Kuli Kuli, appears to be 77% of the way to solving the problem. Their solution is to reforest Haiti, capitalizing on its vast farm labor resources, to raise Moringa cheaply and sustainably. This makes particularly good sense on account of its proximity to the USA, overflowing as we are with preventable diseases. While I'm not affiliated with them, I look forward to trying their product when it's available in early 2016.