A study by the National University of Singapore showed that Chinese dark soy sauce contains 10 times the antioxidants of red wine, and can help prevent cardiovascular diseases.[27] Soy sauce is rich in lactic acid bacteria and of excellent anti-allergic potential.[28][29]
Soy sauce does not contain the level of isoflavones associated with other soy products such as tofu or edamame.[30] It can also be very salty, having a salt content of between 14–18%. Low-sodium soy sauces are made, but it is difficult to make soy sauce without using some quantity of salt as an antimicrobial agent.[31]
100ml of soy sauce contains the following nutritional information according to the USDA: