I have used Missing Link a time or two, didn't notice any outstanding results. Currently we are also blowing our coats, and my two black ones are the worse. I like Eagle Pack Lamb and Rice. I also cook up a chicken soup type stew about once a month with lots of veggies and chicken.
Once in a while I add a little cottage cheese. I also brush daily, and spray (once a week) with something called Dander Free (available from sitstay.com)
I have heard the saying "Labs only shed twice a year......for six months at a time."
hang in there...we eat, sleep and live in Lab hair!!