Lipid ciliology: specialized ciliary membrane lipids in physiology and disease.

Vitamin D supplementation stands at a translational crossroads. Its biological relevance is well-established, supplementation is accessible, and suboptimal vitamin D status remains common across clinical and population settings. From a public health perspective, addressing vitamin D deficiency requires integration of nutritional epidemiology, prevention strategies, and health promotion approaches, particularly in populations characterized by social, demographic, or clinical vulnerability. Yet the central challenge is no longer simply whether vitamin D matters, but how evidence can be converted into safe, targeted, and measurable action. The contributions to this Research Topic move the field beyond a generic “more vitamin D” message. They suggest that the future of supplementation lies in precision: identifying who is likely to benefit, which outcomes should be targeted, what dose and formulation are appropriate, and how efficacy and safety should be monitored. A first theme emerging from the Research Topic is that vitamin D should be interpreted as a regulator of biological networks rather than as a single-purpose micronutrient. provide mechanistic support for this view by identifying early vitamin D-responsive genes in human immune cells, including genes linked to antioxidant defense and redox homeostasis. This mechanistic layer is clinically meaningful because several contributions connect vitamin D status with inflammation-related phenotypes. reported that higher serum 25-hydroxyvitamin D concentrations were associated with lower prevalence of overactive bladder in females, with inflammatory biomarkers partly attenuating the association. extended this inflammatory perspective to intervention studies, showing that magnesium and vitamin D/E co-supplementation improved 25-hydroxyvitamin D status and reduced inflammatory markers in overweight or obese populations, while also emphasizing heterogeneity across trials. Together, these studies support a view of vitamin D action as context-dependent and biologically integrated with immune, inflammatory, and micronutrient networks. A second theme is phenotypic heterogeneity. The articles do not support a one-size-fits-all model of supplementation; rather, they show that associations vary by sex, age, body composition, comorbidity, and vitamin D isoform. Sleep-related outcomes illustrate this point. summarized mechanistic and clinical evidence linking