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Pain Practice
Fine for larger doses, but problematic if you need 100 mcg, because 100 mcg would be just 0.02 mL, or 2 units on the syringe
Symptoms of severe vitamin B12 deficiency can include visual disturbances, severe joint pain, paresthesia (tingling in the hands and feet), memory problems, depression, anxiety, poor muscle function, ataxia (impaired balance and coordination), changes in reflexes and even infertility
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Side Effects can be swelling, redness, tingling or numbness, drainage at the injection site, prolonged bleeding, and possibly some pain at the injection site