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Description
Mild stomach upset with oral capsules in some users
III Opinions of respected authorities, based on clinical experience, descriptive studies and case reports, or reports of expert committees

While vitamin B12 itself doesnt directly cause gas, some factors related to its intake might contribute to digestive discomfort: 1

A condition of low-grade inflammation has been related to NAFLD, with an abnormal production of cytokines and adipokines, such as interleukin (IL)-6, tumor necrosis factor (TNF)-, IL-1, leptin

The small sample size is also listed as another potential limitation of the study
