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Vitamin B12 can treat anemia, help with the production of creatine, which is beneficial for building muscle mass and reducing muscle weakness

The results showed that the overall response rate was 91%, with a complete response rate of 73% and a partial response rate of 18%, indicating that this treatment plan has significant clinical efficacy [134]

Validating a large animal literature [e.g., (98)], newer human studies have demonstrated that exogenous proinflammatory cytokines (e.g., injected IFN-) or other immune challenges (e.g., injected typhoid vaccine) can influence behavior and fMRI brain activity in otherwise healthy humans [e.g., (99102)]

Current Environmental Health Reports, 1 (2), 132147

It may also be a reaction to artificial additives or heavy metal contaminants found in lower-quality brands