Core Viewpoint - The debate surrounding the efficacy of ergothioneine as a dietary supplement has intensified, with prominent figures from both sides presenting conflicting arguments regarding its legitimacy and effectiveness [1][2][3]. Group 1: Company Actions and Responses - On June 5, the "Kelong Yongnian Health" public account published an advertisement for ergothioneine capsules, featuring Kelong Pharmaceutical's chairman Liu Gexin, promoting the product's anti-aging benefits [1][4]. - Following the advertisement, Liu Gexin issued two open letters to the public, endorsing the efficacy of ergothioneine and outlining the company's strategic focus on the anti-aging sector as part of its fourth entrepreneurial venture [1][4]. - Kelong Yongnian Health emphasized that ergothioneine is recognized internationally as a dietary supplement rather than a pharmaceutical drug, positioning it as a health management tool [5]. Group 2: Market Reaction - The stock price of Kelong Pharmaceutical experienced a decline of 4.96% on June 5, closing at 37.47 yuan per share on June 6, with a further drop of 0.74% [6].