are b12 injections red Seeing Red: Do Work? B-12 Shots | Vitamin B-12
Description
Acta Pharm Sin B 12:483495

Known as cobalamin, vitamin B12 is one of the essential vitamins that your body needs

Vitamin B (pyridoxine), when chronically taken in gram quantities, is known to cause a sensory neuropathy, numbness and tingling in the extremities, but the amount of B in this formula (2 mg per mL) is far below such neurotoxic levels
The largest Phase 2b trial (502 participants, 24 weeks) did not show statistically significant weight loss versus placebo

At that concentration, a 300 mcg dose is about 0.18 mL (18 units on a U-100 syringe) and a 500 mcg dose is about 0.30 mL (30 units)