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While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient

Aggressive media campaigns about its exaggerated effects as a skin lightening agent and over-the-counter availability of this drug have resulted in consumption of improper doses and schedules

Kinetics of reaction of peroxynitrite with selenium- and sulfur-containing compounds: Absolute rate constants and assessment of biological significance

Nguyen TX, Huang L, Liu L, Abdalla AME, Gauthier M, Yang G

If the goal is supporting glutathione production pathways, NAC may be a better match