human grade b12 injectable Vitamin B-12 5000 mcg Injection 100mL Vitamin B-12 Injection, 5,000 mcg/mL,
Description
15 Although many research studies and clinical laboratories define vitamin B 12 deficiency at a level of less than 150 pg per mL (110.67 pmol per L), or in some cases 200 pg per mL, patients with values above these levels may be symptomatic and benefit from treatment
You might consider a B12 shot if you follow a vegetarian or vegan diet, since B12 comes mainly from animal foods

This nutrient plays a pivotal role in the production of red blood cells, DNA synthesis, and nerve function

Vitamin B12 I noticed this with one form of B12 that I tried but not with the other form
