Tempeh is a very good source of protein, manganese, and phosphorous. It is also a good source of vitamins B2, B6, and B3, as well as the minerals magnesium, copper, and iron. In addition, it is a good source of monounsaturated fats.
As a product of soybeans, tempeh confers the same health benefits of the soybean, including the anticancer effects.
As the organism that makes tempeh also makes vitamin B12, it is thought that tempeh may be a good B12 source for vegetarians. Unfortunately, evidence shows that the forms of B12 found in fermented foods may not be the best in terms of absorbability into the body. As a result, it is important that vegetarians supplement their diet with vitamin B12.