An unexpected finding from the present study was that 25(OH)D and resting BP were positively correlated, such that individuals with sufficient 25(OH)D (i.e., ≥30 ng/mL) had higher resting SBP (120±14mmHg) than individuals with insufficient 25(OH)D (117±13mmHg; p=0.020). Reasons for this are unclear as mechanistic studies on 25(OH)D and BP have been equivocal. It has been speculated that excess circulating 25(OH)D may disrupt mineral levels within the vasculature, leading to increased mineralization, vascular hardening, inflammation, and increased BP (Razzaque, 2011). Nevertheless, in the present study, the absolute mean BP in the optimal 25(OH)D group is on the lower threshold for meeting the criteria for elevated BP (~120/76 mmHg), calling into question the clinical importance of this finding.