It is illegal for companies selling health products not to sign labor contracts with employees. According to the law of our country, if the employer fails to conclude a written labor contract with the employee for more than one month and less than one year from the date of employment, it shall pay the employee twice the monthly salary. You can propose to terminate the labor relationship according to the specified circumstances (the employer violates the law), without 30 days in advance or approval. Moreover, the employer must also pay the economic compensation of one month's salary for each year of work in accordance with the regulations.

Article 10 of People's Republic of China (PRC) Labor Contract Law

To establish labor relations, a written labor contract shall be concluded. If a labor relationship has been established and a written labor contract has not been concluded at the same time, a written labor contract shall be concluded within one month from the date of employment. If the employer and the employee conclude a labor contract before employment, the labor relationship shall be established from the date of employment.