PMID 15214618
The research utilizes a comparative methodology with a before-and-after design
Quick Comparison Table: When tablets are enough: Mild or early B12 deficiency You have no absorption issues Maintenance doses after recovery When injection is better: Severe nerve damage or neuropathy Pernicious anemia (body can't absorb B12 from food) Post-surgery patients with gut issues What Research Says: A study published by the NIH (National Institutes of Health) found that intramuscular B12 injections showed significantly faster neurological recovery compared to oral supplements in patients with severe deficiency
It is well known that oxidative stress is one of the factors implicated in the pathogenesis of schizophrenia (Mahadik and Mukherjee 1996)
Thirdly, single measurements of serum iron and iron intake do not reflect long-term iron metabolism
Curie A, Touil N, Gaillard S, Galanaud D, Leboucq N, Deschenes G, Morin D, Abad F, Luaute J, Bodenan E, Roche L, Acquaviva C, Vianey-Saban C, Cochat P, Cotton F, Bertholet-Thomas A (2020) Neuropsychological and neuroanatomical phenotype in 17 patients with cystinosis