HomeoPet natural, homeopathic remedies for pets are the only brand of pet homeopathic product that is FDA approved. To preserve their effectiveness, please do not store HomeoPet remedies on top of your refrigerator or microwave. HomeoPet remedies do not expire and are not heat sensitive, but they may be affected by electromagnetic emissions. HomeoPet remedies are packaged in non-leeching plastic to preserve the quality of the solutions.