Protein supplements are a necessity if lean muscle mass is your objective.
I'm gonna have to disagree with that. I don't personally believe it's a requirement. Protein powder can certainly help and can certainly make it easier, but there are plenty of ways to get it all from food. I typically eat 20-30oz of chicken per day, maybe a can of tuna, maybe a slice or two of cheese, occasionally a serving or two of Fage 0% greek yogurt (1 cup is 24g protein), and maybe one or two other things. I usually get 180-200g of protein all from food, and occasionally I'll have some whey if I haven't eaten much during the day and am low like 120-140g of protein.