
Vitamin D3 and Vitamin K2 are not merely individual nutrients; they function as a tightly regulated “metabolic pair” essential for the management of calcium homeostasis and immune resilience. While D3 facilitates the initial absorption of calcium from the gut, K2 acts as the structural “traffic controller,” ensuring that calcium is directed away from soft tissues—such as arterial walls—and into the skeletal matrix where it is biologically required. Unfortunately, modern lifestyles characterized by limited sun exposure and diets low in fermented foods frequently leave individuals with significant systemic gaps. Sports Research Vitamin D3 + K2 provides a clinical-grade, synergistic solution, delivering an ultra-potent 10,000 IU dose of D3 and a standardized serving of K2 to support skeletal health, cardiovascular tone, and robust immune defenses already within a normal physiological range.
The Science of Synergistic Calcium Regulation
The metabolic synergy of D3 and K2 is foundational to total-body health. When taken in isolation at high doses, D3 can lead to increased calcium serum levels, but without adequate K2, that calcium cannot be utilized by the bone tissues effectively. By pairing 10,000 IU of D3 with MenaQ7® (a pure form of K2 as MK-7), Sports Research ensures that your body maintains the metabolic precision required to keep bones strong and blood vessels clear.
Bone Mineral Density Support: D3 elevates intestinal calcium absorption, while K2 activates osteocalcin, the primary protein responsible for binding calcium into the skeletal matrix, preventing bone-density loss.
Cardiovascular & Vascular Tone: K2 activates Matrix GLA Protein (MGP), which inhibits the deposition of calcium in vascular tissues, supporting the long-term flexibility and health of the arterial walls.
Systemic Immune Modulation: Vitamin D3 serves as a profound regulator of the innate and adaptive immune systems, acting as a steroid hormone precursor that supports the body’s natural ability to respond to seasonal environmental stressors.
Key Benefits of Sports Research Vitamin D3 + K2
- Foundational Immune Defense: Provides a robust, high-potency dose to support year-round immune function and systemic resilience.
- Optimized Calcium Homeostasis: Ensures that calcium is efficiently absorbed and properly routed to the bones rather than the arteries.
- Bioavailable Formulation: The coconut oil base (MCT) provides the necessary lipid environment for the absorption of these fat-soluble vitamins.
- Clinically Validated K2: Contains MenaQ7®, the most researched form of Vitamin K2-MK7, renowned for its superior stability and efficacy.
- Purity & Consistency: Non-GMO, soy-free, and third-party tested, providing a clean-label solution for those with complex metabolic sensitivities.
Explore our comprehensive Bone and Immune Support product family here.

Usage Guide
Take one (1) softgel daily with a meal containing dietary fat. Because D3 and K2 are strictly fat-soluble, the presence of fats is clinically mandatory for effective emulsification and uptake. For individuals managing established deficiencies, clinical practitioners may recommend this high-potency dose to achieve rapid systemic saturation, followed by a maintenance protocol. Seek the guidance of your healthcare provider to monitor your serum Vitamin D levels periodically to ensure your dosage remains within an optimal range.
Safety Information
This formulation maintains an excellent safety profile; however, the high-potency 10,000 IU dose is intended for those with specific metabolic requirements. Individuals currently taking prescription anticoagulant (blood-thinning) medications—specifically Warfarin—must consult their physician before use, as Vitamin K2 can significantly affect blood-clotting pathways. Do not exceed the recommended daily dosage. Pregnant or nursing women should seek clinical guidance before initiation. If persistent gastrointestinal discomfort or unexpected systemic reactions occur, discontinue use and consult a professional.













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