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The brain is especially vulnerable to oxidative stress, and glutathione is a key antioxidant that helps protect neurons from damage

This timeline matches B12 pharmacokinetics: intramuscular methylcobalamin reaches peak serum concentration at 8-12 hours, but tissue saturation (particularly in the liver and nervous system) occurs over 48-72 hours as the vitamin is transported into cells and converted to active coenzyme forms (Andrs et al., 2018)

Temperature control is another important factor

Grip strength increased by approximately 60% when the compound was combined with rigorous exercise training, compared to about 25% improvement from either exercise or treatment alone