Genestra Active Chewable B12 - 1000 mcg - Supports red blood cell formation and macronutrient metabolism with a concentrated dose of methylcobalamin, the body’s preferred active form of vitamin B12. B12 deficiency is one of the most common causes of nutrient-related anemia, especially among the elderly, with an estimated 11% of anemia cases in adults 65+ being B12-related.