You need a letter of introduction from the company to apply for a health certificate, and you can only apply for a health certificate with a letter of introduction.
Health certificate refers to the pre-post, pre-post and age-appropriate health examination for personnel engaged in food and drinking water production and management, personnel directly engaged in cosmetics production, personnel who directly serve customers in public places, hazardous workers, radiation workers and school students according to the provisions of national health laws and regulations.