Vitamin b12 injections? any advice

Hi, I am thinking of buying Vit B12 and syringes to inject it, has anyone done this or have advice about it?

Nats.x.x.x

B12

do not do this unless you have seen a doctor you should be given these injections by a nurse or doctor. they are very painful snd must be carefully done . you can take V12 in tablet form but this is not as effective you docter will do tests to see if you need this . hope this helps