Technical bits - it's 2,000mcg/ml so twice or 4 times stronger than most
b12 (depends which one you get).
It has 2 esters in it, one quick acting, one longer acting - similar to sustanon's 4 test esters. So, technically you can just inject 1ml/week and that would be fine. I personally like to use 1ml EOD as I like the 'kick' from the short ester. Even if you use 2ml/week, a bottle will last you 1 year, so it's pretty good value that way too.
You can inj IM or SQ.