According to the Law on the Protection of Consumers' Rights and Interests, "consumers have the right to ask business operators to provide prices, places of origin, producers, uses, performance, specifications, grades, main components, production dates, expiration dates, inspection certificates, instructions for use, after-sales services or the contents, specifications and expenses of services." .
Therefore, his secret recipe 1% is not the main ingredient and does not infringe on consumers' right to know. Did not apply for a patent, protected by trade secrets. The disadvantage is that it can't fight against bona fide third parties. Anyway, no one can crack his formula so far, and he is happy to sell it as a gimmick.