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doi: 10.1016/S0165-5728(02)00095-4

However, compounded medications are not required to undergo the same rigorous testing for bioequivalence that generic drugs require

Some medications can reduce the absorption of vitamin B12 including me dull, tobramycin, gentamicin, and other medications such as tributyl antihistamines

Some people prefer to take a sublingual (under the tongue) daily supplement or a monthly injection of B12 as both of these methods bypass the digestive system and help avoid poor absorption issues

In March 2025 it will be a year since the Nice Guideline on B12 Deficiency in over 16s was published

The false-low b12 phenomenon complicates assessment further