Milk Bones are not good.They contain biproducts(unspecified,therefore unsafe)and unsafe preservatives.Instead,look towards high quality natural biscuits
There are plenty options in various countries,but they must be completely safe which Milk Bones are not!
By the way you won't specifically see those things on Milk Bones in the UK.There are label loopholes(EC permitted antioxidants/additives/etc for example)which allow unspecified preservatives to go into products.EC permitted includes ethoxyquin/BHA/BHT and therefore should be automatically considered unsafe.You won't see specifically labelled biproducts in the UK either,instead you'll see something like animal digest.This is just as bad as biproducts and is a loophole to include slaughterhouse waste and all the undesirables.