Any idea where I can buy fish meal with Naturox in California and experience with feeding it to your

I am looking to try adding some fish meal with Naturox to a flock of chickens that I got from a neighbor that are in poor health. I was thinking that might be something that would help them out since they have only been fed whole kernel dried corn until I got them. They are emaciated and have lice/mites and worms which they are being treated for. Does anyone have any idea where I could purchase it in Central Coast California or anywhere in Cali? I am not finding it. Also has anyone used it on your flock and if so did you notice an improvement and how much did you use? Did you just add it to the food? Thank you for any advice on it and I am new to this so I am learning so much from this site!