You cant overdose, and theres no toxicity threshold
Vitamin B12 Supplements Depending upon the reason for the vitamin B12 deficiency, It may be treated through oral supplements or injections
In such cases, 1000 mcg of B12 is injected into the area, often preceded by a numbing agent such as thiamin or lidocaine
Many clinics exclude this group
They will review your medical history (or may be able to assess you for anemia and treat as clinically indicated ) , help you understand the risks and symptoms of vitamin B12 deficiency, and share advice for prevention
Clinical Benefits Supports NAD+ metabolism and mitochondrial functionkey factors in cellular energy production, vitality, and overall metabolic efficiency