Thank you for choosing the high-quality chemical products of Henan Gaoneng Biotechnology Co., Ltd. The company is committed to providing you with the best after-sales service to ensure your satisfaction and trust. Our after-sales service process is clear, efficient, professional and thoughtful, helping you enjoy a worry-free product experience. 1. Consulting support: If you encounter any product-related problems, you can contact our customer service team through the official website, phone or email. We respond quickly, provide professional answers, and provide you with a full range of technical support. 2. Return and exchange policy: If the product has non-human quality problems, we support unconditional returns within 7 days after receiving the goods. You only need to provide valid proof and we will handle it for you as soon as possible. 3. Maintenance and repair: If there is a problem with the product during the shelf life, we will provide free repair services. If it exceeds the validity period, we will also provide paid high-quality repair services.