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13 articles were assessed for eligibility and 3 were eventually included in the analysis

Decreased stomach acid production also provides an environment conducive to the overgrowth of anaerobic bacteria in the stomach, which further interferes with vitamin B 12 absorption (3)

Biomaterials, 2021, 268: 120545 Shi H, Sun Y, Yan R, et al
Saponins in the genus Panax L.(Araliaceae): a systematic review of their chemical diversity
