yes it is ok but useless for your use..... super maket stuff has been filtered etc for human consumption and all the benifical bits for birds digestion etc has been filtered out so its useless for the purposes of poultry tonic, this has also been the subject of an article in PP magazine which confirms my info to you, supermarket stuff wont do any harm but it wont do any good either, someone said theyve used supermarket stuff for years and their birds have thieved on it , how can you tell that, they would have thrieved without it. its got to be straight from a brewer or from a poultry farm shop. you are better off putting it on your chips and useing garlic in their drinking water. these days theres a lot of cider presses all over the country it isnt just somerset., my local one is in norfolk. If your supermaket stuff has a sediment at the bottom of the bottle (bacteria etc) and states unfiltered then i might be ok