These foods can be used as occasional supplements to a dog's standard diet. (reference.com)
Protein shakes can be beneficial as occasional supplements to a normal diet, but they should not replace the nutrition you get from food. (healthyeating.sfgate.com)
For those of us who (hopefully) don't smoke or have cancer, a diet rich in vitamin C and some occasional supplements will likely just help keep inflammation at bay. (wellnessmama.com)