Flock Party Eggmaker is pricey. Its a Layer Formulation, albeit one with better Methionine and Lysine levels than some. That said, it is a
LAYER formulation, providing calcium level intended for peak production layers. That amount of calcium is NOT good long term for hatchlings, adolescents, roosters of any age, or even hens who are infrequent layers of small or medium eggs. Its intended for first and second year Comets, Isa Browns, Leghorns, and other high producers of large to xtra lg eggs.
Most of us BYCers maintain mixed flocks of things other than peak production layers, which is part of why most of us active on the feed forums
recommend an "all flock" type formulation, all the time, for all your birds at all ages, with free choice fresh clean water and free choice oyster shell or similar supplemental calcium source, as
@nuthatched did above. FWIW , I have a mixed flock of chickens and ducks, all getting the same feed. My flock is in my sig below.
Yes, plenty of BYCers use Nutrena NatureWise All Flock with good result. I've used it myself and was pleased, though its a little pricy locally compared to similar products.
You said, " Looking at the labels gets confusing when you don't know exactly what everything means."
We here at BYC are happy to help you understand how to read a feed label. If you don't get an answer quickly (there's a lot of common questions with broad agreement as to the answer) feel free to @ me. I'm on every other day, sometimes more. Plenty of other very experienced posters on this topic. If you troll this forum, you will see some names float to the top.