About the Product
Amix Vitamin D3 2500 IU with Calcium is a dietary supplement in capsules that combines 2500 IU (62.5 mcg) of Cholecalciferol (Vitamin D3, the most bioavailable and biologically active form of Vitamin D) with 250 mg of Calcium Carbonate per capsule. The combination of Vitamin D3 with Calcium in a single capsule is synergistically relevant from a physiological perspective: Vitamin D3 is the primary regulator of intestinal Calcium absorption, being essential for ingested Calcium to be effectively absorbed and utilized by the body. Without adequate Vitamin D3 levels, Calcium absorption drops to 10 to 15% of the ingested dose; with optimal Vitamin D3 levels, absorption increases to 30 to 40%. The dose of 2500 IU of Vitamin D3 per capsule positions this product in the moderate to high-dose supplementation segment, suitable for adults with documented deficiency or risk of Vitamin D insufficiency.
Benefits
Cholecalciferol (D3) for immunity, bone health, and muscle function: Vitamin D3 (Cholecalciferol) is the form of Vitamin D produced endogenously by the skin in response to sunlight exposure to UVB rays, and it is the form with the highest oral bioavailability and greatest efficacy in raising serum levels of 25-hydroxyvitamin D (25(OH)D), the reference marker for Vitamin D status in the body. As recognized by the EFSA, Vitamin D demonstrably contributes to the normal functioning of the immune system, the maintenance of normal bones and teeth, normal muscle function, the normal absorption and utilization of Calcium and Phosphorus, and the maintenance of normal blood Calcium levels. Vitamin D deficiency is one of the most prevalent globally, especially in countries with less sun exposure, in people with dark skin, in adults over 65, and in athletes who train predominantly indoors (gym, indoor pool).
2500 IU per capsule for effective correction of insufficiency and maintenance of optimal levels: The dose of 2500 IU (62.5 mcg) of Vitamin D3 per capsule is a moderate to high supplementation dose, clearly higher than conventional multivitamin doses (typically 400 to 1000 IU), but well below the tolerable upper limit established by the EFSA for adults (4000 IU/day for long-term use, with a safety margin). This dose is suitable for adults with documented insufficiency (25(OH)D between 20 and 30 ng/ml) who want to quickly reach optimal levels (40 to 60 ng/ml), and for maintaining optimal levels in adults at high risk of deficiency, especially during the autumn and winter months when skin synthesis of Vitamin D is minimal in Portugal and in countries with similar latitude.
Calcium Carbonate (250 mg) for bone health and muscle function: Calcium Carbonate is the form of Calcium with the highest concentration of elemental Calcium per gram of salt (40%), making it efficient in terms of capsule volume. Each capsule provides 250 mg of elemental Calcium (from Calcium Carbonate), which represents 31% of the daily NRV of Calcium for adults (800 mg). As recognized by the EFSA, Calcium demonstrably contributes to the maintenance of normal bones and teeth, normal muscle function, normal nervous system function, and normal blood clotting. For athletes, Calcium is especially relevant due to its participation in muscle contraction (troponin-actin-myosin mechanism), where it acts as an intracellular second messenger that triggers the process of muscle fiber contraction.
Physiological synergy D3 + Calcium to maximize Calcium absorption and utilization: The combination of Vitamin D3 with Calcium in a single capsule is not just convenient: it is physiologically synergistic. Vitamin D3, after hepatic conversion to 25(OH)D and renal conversion to 1,25(OH)2D (calcitriol), regulates the expression of Calcium transport proteins in the small intestine (calbindins), increasing the capacity for active intestinal Calcium absorption in a dose-dependent manner. By taking Vitamin D3 and Calcium in the same capsule and at the same time, it is ensured that Vitamin D is available to enhance the absorption of the Calcium ingested in the same dose, maximizing the effective bioavailability of supplemented Calcium.
Specific relevance for indoor and high-intensity sports athletes: Athletes often have higher Vitamin D needs than the general population, both due to the greater demand on bone tissue (repetitive mechanical stress) and due to Vitamin D's role in muscle protein synthesis, immune function (important for maintaining training capacity), and modulation of post-exercise inflammation. Athletes who train predominantly in gyms, indoor pools, or during periods of limited sunlight (morning training before sunrise, night training) are at an especially high risk of Vitamin D insufficiency, making supplementation particularly relevant in this group.
Directions
Recommended dose: Take 1 capsule daily with a fat-containing meal to maximize the absorption of Cholecalciferol, which is a fat-soluble vitamin whose intestinal absorption is significantly improved by the presence of fat in the meal.
Timing: Taking it in the morning with breakfast is often recommended, as some studies suggest that Vitamin D may interfere with melatonin production when taken at night, potentially disturbing sleep in sensitive individuals.
Storage: Store below 25°C in a cool, dry place, away from sunlight and humidity. Keep out of reach of children.
