how often should b12 injections be taken Injections: Who Get Them and Long Do They Last? How to Give a B12
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People with stomach issues might do better with sublingual or injectable forms
The first is a 2014 Nature paper in which researchers knocked down NNMT in the fat and liver of mice

Treatment-Related Dysgeusia in Head and Neck Cancer Patients

Additional in...dicators of vitamin B12 deficiency may include depression, headaches, gastrointestinal problems, muscle weakness, pale/yellow skin, loss of appetite, etc
