I did both, and I must admit that I felt the effects more quickly with the nasal spray.
So I decided to reconstitute my vials both ways.
One vial in the form of a nasal spray, where I use saline water, not bac water.
And one vial as an injection, which I reconstitute with bac water.
I take the spray in the morning, and another dose in the evening, if necessary, by injection.
I will do this for my entire kit