The same additive in the store dog food is in the cereal corn flakes cherrios etc. etc. yet no one cares Try to eat a small amount you want more. I buy for my two dogs blue buffalo The shine on their coats make it well worth it. I was at the park with my beagle another lady had her beagle she said you buy the pet store dog food and I said yes She said so much for my husbands idea that all dog food is the same.Her dogs coat was dull and lifeless mine glittered Both dogs were the same age and healthy.