vitamin b12 injection dosage for deficiency Are Shots Right You? Vitamin B12 Injections (Cyanocobalamin Injections)

High doses of B12, often used to treat deficiencies, may cause side effects such as headaches, nausea, diarrhea, fatigue or weakness, and tingling in the hands and feet

Administer slowly and with caution in doses over 1/3 mL (50 mg Thiamine).

Sublingual tablets & sprays A sublingual B12 tablet offers superior delivery as it gradually releases B12 as the tablet melts, ensuring adequate time for absorption into the blood vessels

These are foods that have had B12 added and if you eat these foods regularly, i.e

This direct delivery is why the timeline for injections is often measured in days rather than weeks, especially for someone who was deficient