Additionally, oral supplements require daily adherence to maintain consistent levels, which can be a challenge for some people
Your doctor will typically monitor your response through clinical improvement and blood tests such as full blood count, rather than rechecking B12 levels after starting injections
This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation
A deficiency in the mother can lead to low B12 levels in the infant, potentially causing developmental delays or neurological issues