I just started feeding mine Manna and BOSS about three weeks ago. I have 5 6 month olds, and several hens molting and they are really burning through their pellets.
The BOSS I actually started with about a month ago, and just added the manna a week later. I have actually seen an increase in egg production and the size and quality of the eggs. I dont know how long it takes before you see a difference, but nothing else has changed for them so....
I just mix up 1/3 manna and 2/3 BOSS and throw it out in the yard like scratch for them. They come running to the fence in the mornings waiting for it!