After many trials of vitamin B12, I think I found the right one. It has a very nice taste and it is effective

I don't know if it's effective, after all, that takes time to show, but both that I bought have problematic spraying (from minimal to none).

Fast and efficient. Longer duration of use. Proven effective both in practice and in the laboratory.

Intense apricot flavor. Slightly more expensive compared to this:
https://www.skroutz.gr/s/10096104/John-Noa-Origin-Spray-Vitamin-B12-30ml.html