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Three have consistent evidence: enough total protein, creatine monohydrate at 3 to 5 grams daily, and enough calories. Protein powder is a convenient way to hit the first, creatine improves output on repeated hard sets, and neither works without progressive training. Everything else in this category is optimisation at the margins.

Between 1.6 and 2.2 grams per kilogram of bodyweight per day, from all sources combined. Beyond roughly 2.2 grams per kilogram the research shows no further benefit for muscle growth.

EAAs if either, and only if your total protein is already low. BCAAs supply three of the nine essential amino acids, which is not enough to build muscle protein on their own. If you are hitting your protein target, neither adds much.

Yes. They work through different mechanisms — creatine on phosphocreatine availability, protein on muscle protein synthesis — and there is no interaction. Mixing creatine into a protein shake is fine.

Strength improvements from creatine typically appear within two to four weeks. Visible muscle change from training and adequate protein takes eight to twelve weeks of consistency. Anything promising faster is selling something.