I switched my girls to a new product by Nutrena called Feather Fixer. It is designed to be fed during molt with pre and pro biotics and increased protein. Been feeding for a couple weeks and can really see an improvement! I also give them other protein treats but you have to be careful! Adding too much protein can throw the calcium/protein equation out of balance and cause problems if your girls are still laying or will delay them re-starting.
I hate to be a pain, but can you source this? I keep reading/hearing different things about protein ... from too much can destroy a bird's kidneys, too much can make a bird grow too fast, etc., but have also been told by a nutrition specialist at an organic feed mill that "extra" protein is actually not a problem for poultry.