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Researchers had previously believed that vitamin B-12, when combined with folic acid (vitamin B-9) and vitamin B-6, might prevent diseases of the heart and blood vessels by reducing the levels of an amino acid in the blood (homocysteine)

However, due to limited human clinical trials, long-term safety is not fully understood

The single biggest variable that actually affects outcomes isn't timing

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Perturbations in gut microbiota composition in psychiatric disorders: a review and meta-analysis

Vitamin B12 plays a critical role in supporting red blood cell formation, neurological health, and DNA synthesisdeficiencies can lead to fatigue, mood changes, and cognitive decline