why would i need a b12 injection Shots & B12 Injections: The Good, Bad and Alternative! Benefits of Vitamin B12 Shots

How much should I use in my formulation

Consistency across days matters more than perfection on a single day

"Nascobal (Cyanocobalamin, USP) Nasal Spray 500 mcg/spray 0.125 mL Rx only" (PDF)

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That's why it's important to let your doctor know if you have any of the following conditions before you're prescribed hydroxocobalamin: If you've had an allergic reaction to hydroxocobalamin or any other medicines in the past If you've been diagnosed with low levels of potassium If you have an irregular or fast heartbeat Once you've started taking hydroxocobalamin, you may have some side effects such as pain, swelling, or itchy skin at the point where the syringe was injected