i have a bottle of b12 i didnt buy it it was free. i have never really considered using b12 before. if i were to take it how and when should i use it? i am currently off cycle and dont plan on getting back on until about march. i read alot saying it is crap, but i got it here and dont want to just throw it away. what if i did it now off cycle, its not gonna shut me down or anything like that is it?