Study links intermittent UVB exposure to higher vitamin D in skinks

A new study in the American Journal of Veterinary Research found that intermittent ultraviolet B exposure increased plasma 25-hydroxyvitamin D3 concentrations in blue-tongued skinks, adding species-specific evidence to a husbandry question that’s often guided by extrapolation from other reptiles. In the randomized experimental study, 11 subadult skinks were assigned to either 2 hours of UVB exposure every 3 days for 30 days or no UVB exposure, and the UVB group showed increased circulating vitamin D metabolite concentrations compared with controls. The finding aligns with broader reptile nutrition guidance that UVB light is central to endogenous vitamin D synthesis, while species-level requirements and dosing schedules remain incompletely defined. (repository.lsu.edu)

Why it matters: For veterinary professionals seeing reptiles in general practice or exotics caseloads, the study helps narrow a practical husbandry gap for blue-tongued skinks. Merck notes that UVB exposure, distance from the lamp, bulb type, and replacement schedule all affect vitamin D production in reptiles, and that daily exposure is still commonly recommended because exact species-specific maintenance needs remain uncertain. This new skink-specific work suggests that at least some intermittent UVB schedules can meaningfully raise 25-hydroxyvitamin D3, which may inform discussions with pet parents about enclosure setup, metabolic bone disease risk, and the limits of relying on diet alone for vitamin D support. (merckvetmanual.com)

What to watch: Whether follow-up studies define optimal UVB intensity, lamp type, and maintenance intervals for blue-tongued skinks over longer husbandry timelines. (merckvetmanual.com)