PurAmino Jr. Unflavored Powder, 14.1 ounce (400 gram) Can, 1,980 Calories Per Can. PurAmino Jr is a 30 Cal/fl oz, iron-fortified, hypoallergenic, amino acid-based medical food for the dietary management of children aged 1 year and up with severe cows milk protein allergy, not effectively managed by an extensively hydrolyzed formula. PurAmino Jr is also indicated for the dietary management of children with multiple food protein allergies. It may also be suitable for conditions requiring an elemental diet such as protein maldigestion, malabsorption, short bowel syndrome and eosinophilic esophagitis.