Ester-C has immune health covered it supports circulation is beneficial to and connective tissues, helps reduce the premature aging of and forms the basis for healthy skin . Ester-C aids in the nutritional absorption of iron and works with other nutrients to promote overall health. Along with essential vitamins, such as B-6 and B-12 to support energy metabolism and vital electrolytes to aid in metabolic hydration. Product Benefits. Dietary Supplement. Uniqua Vitamin C Formula. 24 Hour Immune Support. Plus Electrolytes. Effervescent.