Peptamen® Tube Feeding Formulas | Peptamen® Peptamen ® Formulas are designed for adults and older children (age 14+) with GI impairment, and can be consumed via tube-feeding and/or taken orally. Hover over the … Peptamen ® Formulas are designed for adults and older children (age 14+) with GI impairment, and can be consumed via tube-feeding and/or taken orally. Hover over the …