Creatine Shows Modest Association With Lower Depressive Symptoms in Large Observational Cohort

The observational design used food-frequency questionnaires and PHQ-9 scores collected between 2006-2010. Higher creatine consumers showed reduced anhedonia and fatigue items but no difference in suicidal ideation. Effect size remained after controlling for protein intake yet disappeared when stratified by sex, with men driving the signal.

Mechanistic overlap with HSV-1 research is indirect: creatine buffers brain energy metabolism, potentially mitigating inflammation-linked mood changes that viruses may exacerbate in vulnerable neurons. No interventional data here, unlike small RCTs in major depression showing 5-8 point Hamilton score drops at 4 g/day.

Next required step is a placebo-controlled trial powered for remission rates at 12 weeks, stratified by baseline creatine levels and sex, with MRI energetics as secondary endpoint.

Funding from industry sources was absent, yet self-reported intake limits causal inference.