USDA certified organic food developed by 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 trying other Harrison's products. We also suggest 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.