While creatine supplementation triggers genuine metabolic adaptation, its practical benefits depend heavily on individual nutritional status and baseline metabolism. Vegetarians and vegans represent the population most likely to benefit, as they consume zero dietary creatine and rely entirely on endogenous synthesis. In these groups, supplementation reduces the metabolic burden on methylation pathways by downregulating the AGAT enzyme—the first step in creatine production. However, clinicians should recognize an important distinction: while supplementation spares methylation demand, freed methyl groups are redistributed throughout cellular pathways rather than accumulated as a net metabolic benefit. Current evidence shows reduced plasma guanidinoacetate but inconsistent homocysteine effects across studies. For omnivorous populations consuming dietary creatine, downstream clinical advantages remain context-dependent and warrant individualized assessment. Read the full article on GMJ Newsroom.
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