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All mechanistic descriptions remain observational and confined to preclinical research systems

Vitamin B-12 status in infancy is positively associated with development and cognitive functioning 5 y later in Nepalese children

doi: 10.1021/acs.jmedchem.9b01255

User reports consistently mention mild headaches, particularly during the first week or two of use

These include: Metformin (used for diabetes or PCOS) Proton Pump Inhibitors (used for acid reflux or GERD) H2 Blockers Birth control pills Certain antibiotics If youre taking these medications long-term, particularly in combination, regular B12 injections might be beneficial

Either it's underdosed, impure, or fake