USDA certified organic food for medium and large parrots developed by world-renowned avian veterinarian Greg Harrison. This food contains no pesticides, GMOS, preservatives, or artificial ingredients. It is simply nutritious, natural, and wholesome. It is recommended that birds be first switched to the High Potency formula for at least 6 months before offering other Harrison's products. We also recommend reading all the instructions before use, as this product contains no preservatives and must be kept in its original container for up to 6 weeks after opening.