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Oral supplements have not worked for you, which is common when an absorption problem is the underlying cause

Methods for the analysis of vitamin B 12 in food Several methods have been used to determine the vitamin B 12 content in foods including microbiological assays, chemiluminescence assays, polarographic, spectrophotometric, and high-performance liquid chromatography processes

Age affects both absorption and utilisation of B12, with older adults often experiencing slower responses

The trade-off involves doubling the number of injections required

Heres what most people experience

They can assess your symptoms and adjust treatment if necessary