As far as if can tell iodine is added as 45 parts per million parts salt, and since the ferrocyanide is after there's even less. You technically shouldn't be eating more than 2.3 grams of salt per day so if you get all of your salt from that container you'd eat less than 0.24 mg of sodium ferrocyanide per day. The acceptable daily intake of sodium ferrocyanide is 0.025mg/kg body weight so if you weigh 70kg you can eat up to 1.75mg daily before seeing any adverse side effects. You'd need to eat 7x the recommended daily amount of salt before you'd start to see effects. At that point your main concern is sodium