公告日期：2025-04-30

JOINN Laboratories (China) Co., Ltd.

北京昭衍新藥研究中心股份有限公司

(A joint stock company incorporated in the People’s Republic of China with limited liability)

（於中華人民共和國註冊成立的股份有限公司）

（Stock Code 股份代號：6127）

NOTIFICATION LETTER 通知信函

29 April 2025
Dear Non-Registered Shareholders,

JOINN Laboratories (China) Co., Ltd. (the “Company”)

– Notice of publication of 2024 Annual Report (the “Current Corporate Communication”)

The English and Chinese versions of the Company’s Current Corporate Communications are available on the Company’s website at www.joinnlabs.com and the website of The Stock
Exchange of Hong Kong Limited (the “Stock Exchange”) at www.hkexnews.hk respectively (the “Website Version”). The Company strongly recommends you to access the Website
Version of Current Corporate Communication.

If you have difficulty in receiving email notification or gaining access to the Website Version of the Corporate Communications and would like to receive the Current Corporate
Communication and all future Corporate Communications in printed form, please complete, sign the enclosed Request Form and return it to the Company’s H share registrar in Hong
Kong, Tricor Investor Services Limited (“H Share Registrar”) at 17/F, Far East Finance Centre, 16 Harcourt Road, Hong Kong by post using the provided prepaid mailing label (no
stamp is needed if posted in Hong Kong) or by email to is-ecom@vistra.com. The Company will promptly upon your request send the Current Corporate Communication to you in
printed form free of charge.

As a non-registered shareholder, if you wish to receive Corporate Communications of the ……
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