Which peptide types are best suited for neurobiology research?

I’m knee‑deep in a neurobiology project and honestly feeling a bit out of my depth with all the peptide options out there. Every paper I read throws around different types like everyone’s supposed to just know which ones actually work best. I’m trying to figure out what people here have had real hands‑on success with—something reliable, not just theory. I don’t want to waste weeks (or my tiny budget) ordering peptides that won’t even move the needle. If anyone’s worked with specific peptide types that really shine in neuro research, I’d love to hear what’s actually worth trying.