This 12-week, randomized, double-blind, placebo-controlled Phase 2 study will evaluate two fixed-dose oral combinations of L-leucine, sildenafil, and metformin (NS-0200) versus matching placebo in adults 18-75 years with hypertension. Approximately 150 subjects will be screened to randomize \~150 (≈50 per arm) with an expected completer population of \~120. The primary objective is to compare change in mean seated systolic blood pressure from baseline (Day 1) to Week 12 (Day 84) for each NS-0200 dose versus placebo. Secondary outcomes include change in seated diastolic blood pressure and change in body weight. Safety will be monitored through adverse events, labs, vital signs, ECGs, and pregnancy testing.