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Certainty assessment To assess certainty of evidence across the included studies, the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) Working Group guidelines were used

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Proteins are more fragile than most people realize

Maintaining healthy vitamin B12 levels supports: Energy production Brain and cognitive function Nervous system health Overall wellbeing A deficiency in vitamin B12 can lead to fatigue, weakness, and neurological symptoms

Opitac is a pharmaceutical-grade, reduced L-glutathione manufactured by KOHJIN Life Sciences in Japan under strict quality standards