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Some people report acne or a flushing sensation after high-dose injections, but that relates to the injection rather than the blood level

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Specific dosing depends on the condition being treated, administration route, and individual response

Low B12 levels can contribute to fatigue, weakness, anemia, and neurological symptoms

At certain concentrations and time points, overstimulation may suppress rather than enhance melatonin output, highlighting the importance of dose, timing, and context when considering clinical protocols [1]

This randomized controlled trial demonstrates that 28 days of vitamin B complex supplementation significantly improved exercise endurance and reduced fatigue-related biomarkers in healthy adults