b12 nasal spray vs. injection Cyanocobalamin 500 mcg: Boost & Energy — Mountainside Medical B12 Nasal spray - who

I think the shot is taking hold now but yes, it could have been too strong intially at first

An update

Prevention of vitamins deficiency for the following diseases (excluding vitamin K) - Surgical surgery, severe burn, fracture and other injuries - Severe infection, coma Dosage Adults and children over 11 years : after melting this medicine by putting it into 5mL distilled water for injection by gently shaking, mix it in 500~1,000mL of glucose injection solution, saline or equivalent injection solution for intravenous injection within 5 minutes, and inject by intravenous infusion once daily Package 10V Never be multivitamin deficient

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If there is a lack of B12 in your system, it can lead to nerve damage

Typical starting doses range from 0.5 g to 2 g (10 - 40 mL of the 50 mg/mL solution) given intermittently (e.g., weekly)