【How-to】Is tempeh good or bad for you

1. Tofu, Tempeh, Natto and Soybeans. … Similarly, 6 ounces (168 grams) of tofu or tempeh each offer 3–3.6 mg of iron, or up to approximately 20% of the RDI (5, 6). In addition to iron, these soy products contain between 10–19 grams of protein per portion and are also a good source of calcium, phosphorus and magnesium.