Modeling a methylmalonic acid-derived change point for serum vitamin B-12 for adults in NHANES
Neurological symptoms deserve particular attention
If low levels of B 12 remain for a long time, the condition also can lead to irreversible damage to nerve cells, which can cause the following symptoms: numbness and tingling in the hands and feet difficulty walking muscle weakness irritability memory loss dementia depression psychosis
Much of what is sold online is labeled research only, and the purity of those products is highly variable, with independent testing repeatedly finding under-dosed, degraded, or mislabeled peptides across the unregulated market
People with documented malabsorption disorders including Crohns disease, celiac disease, or those whove had portions of stomach or small intestine removed need direct delivery
Another study conducted by the University of California found that B12 supplements improved energy levels and reduced fatigue in individuals with chronic fatigue syndrome