The thinking seems to be that subQ might not get past the blood brain barrier as well, while nasal can reach the brain along the olfactory nerve. So nasal is my choice too, even if it could just be placebo.
From what I've seen in my own reading, nasal spray seems to be the favored way to take Adamax, though subQ is another option that some try even if it's considered less ideal. How well does that match up with actual experiences people have had?