Support bone health, immune function, and overall wellness with the HormoneSynergy® / RetzlerRx® Vitamin D3 Supplements Collection. This physician-formulated lineup features high-potency Vitamin D3 capsules and softgels designed for optimal absorption and evidence-based dosing. Backed by clinical research and crafted with premium ingredients, these supplements help maintain healthy vitamin D levels, strong bones, and immune resilience year-round.