B-12 Nasal Spray or Injections, which is better?

I prefer the injectible B-12 since it's just a once every six weeks thing... my pcp is having fits and wants me to take the nasal spray form of B-12, daily. After years of taking pills every day, I am delighted to finally be free of all those daily meds. And the injection is just so much easier. Does anyone know why the nasal form of B-12 would be any better than the injection? My insurance covers the injection, so that's not the issue... The last time I saw the pcp for an injection of B-12, he said it was the last one he'd give me, it was the nasal spray or nothing... I don't know where this pcp got the wild hair from, but it must be quite an irritant to him...lol, other than this issue, he's not that difficult to deal with. :o\

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