Doctors also recommend supplementing with formula during times when milk supply is low. (myorganicformula.com)
I wouldn't recommend supplementing with iodine by itself; you want to supplement with selenium and iodine combined because you want to get the selenium in there with the iodine. (supernutritionacademy.com)
Some weight gain dog food reviews recommend a supplement in addition to a dog's normal food. (geekwrapped.com)