ImprovD3™ by Activ’Inside is a patent-pending synergistic formula combining vitamin D3 (cholecalciferol) with standardized green tea extract (Camellia sinensis L.). Developed to enhance vitamin D3 bioactivity, it upregulates conversion to calcitriol, delivering measurable immunological support. The formula provides polyphenols that boost leukocyte function and antioxidant capacity. Supplied from France, ImprovD3™ carries Halal and Kosher certifications, is suitable for food supplements, and offers reliable functionality across capsules and tablets at a recommended daily dose of 187 mg.