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Mastigen-S is an over-the-counter (OTC) oral liquid nutritional supplement developed and marketed by Nippon Zoki Pharmaceutical. Formulated as a strawberry-flavored, low-calorie, fat-free drink, it is indicated for nutritional supplementation and the relief of physical fatigue, sluggishness, and nutritional deficiencies, particularly during pregnancy, lactation, or illness. The formulation contains a combination of active ingredients including ammonium iron citrate (providing iron), calcium gluconate, vitamins B2 (riboflavin) and B6 (pyridoxine), taurine, potassium and magnesium aspartates, nicotinamide, and anhydrous caffeine to support energy metabolism and address anemia-related fatigue.
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