Boc157/tb500 nasal spray vs injection. Is there much of a deference in efficacy?

I’m wanting to get my dad on this stack and he will be brand new to peptides, so I want to keep it as easy as possible for him. He would benefit tremendously from this combo. I would obviously prefer to go w/ the nasal spray just so it’s easier for him to use. Will it be effective or is it that combo much more effective via injection? Thanks!