Waccamaw i agree with you and frostypaws. By taking the recommended dosages of b vitamins and iron this alone will not cause problems for your animal but like both of you said coupling a blood builder with drying out a dog causes problems. Which is why i said i wean the dog off of those vitamins toward the end of a keep. Drying a dog out naturally or with a drug and then giving the dog those vitamins is trouble jmo.