do vitamin b12 injection go bad Feeling worse after Injection: Answering concerns What happens if you inject
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Frequently Asked Questions Are vitamin injections right for me

Long-term users should be assessed if symptoms of deficiency develop, with supplementation provided if deficiency is confirmed

2014;63(25 Pt B):29853023

Whilst the NHS notes that taking up to 2,000 micrograms daily is unlikely to cause harm in most people, there is generally no benefit to consuming such excessive amounts unless treating confirmed deficiency under medical supervision