how often to take vitamin b12 injections Will I Need B Complex Injections? B12 Injection Dosage and Frequency:

After a single hydroxocobalamin injection, therapeutic levels can be maintained for approximately 8 to 12 weeks in most patients, which aligns with the standard maintenance schedule of injections every 2-3 months recommended in the British National Formulary (BNF)

Your doctor will provide specific recommendations

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When metabolism slows, the body tends to use fewer calories, and fat reduction becomes more challenging

In other words, pills can take longer to raise B12 levels, so if you need a quick boost, injections are the better choice