1. Official certification: official website and authorized sales channels of Yiyang Tongkang will undergo strict certification and audit to ensure that the goods sold are genuine and meet relevant quality and safety standards.

2. Brand reputation: Yiyang Tongkang, as a well-known health brand, pays attention to product quality and user experience and has a good brand reputation.

3. User evaluation: The products of Yiyangtongkang have a large number of user groups and good reputation in the market, and the user evaluation is relatively high.