i think most products are aimed at emptying the fanciers pocket , i look at maintaining health , im not looking for a miricale go faster potion , i've tried many products over the years and dismissed them Aviform Ultimate , fresh garlic , cider vinegar and natual naturaline and orego stim do work . but products dont replace hygene or natural vitality or natural immunity in a loft , thats down to removing weak birds good hygene and common sense and hard work I have the use of a good vet and test quite regulary as i say these products do work if they didnt i'd be the first to bin them the amount of money i'd use on treating blind alone would easily pay fer these few products