vitamin b12 injection burning sensation Compounded B-Complex Do B12 Injections Hurt? Painful
Description
This vitamin is also essential for preventing megaloblastic anemia, a condition that makes people feel tired and weak

Feel the Boost Depending on the formula, most people feel improvements within hours to a few days
Indian J Clin Biochemistry: IJCB

You may suffer from tingling and numbness due to nerve damage, as well as anemia that can manifest as weakness and pallor

Legality and Availability FDA Status : Not approved for human use in the US
Any mild soreness usually settles within a day