In July, some employees at L'Oreal's New York office learned they would go back into the office after months of working from home.
In an email to staff L'Oreal's HR chief, Stephane Charbonnier, said they planed to increase its current maximum of 25% of employees at the office to 50%.
CNN obtained the email, which said worker "will be expected to be onsite if you are assigned by your manager to be onsite."
The only exception is approved paid-time off or a reason approved by the company.
CNN spoke employees who expressed concerns about health risks of showing up to an office during the pandemic
They felt their jobs could be done from home. They said meetings are still being done virtually.
The company said in a statement to CNN, "L'Oréal's plan to cautiously return employees to worksites is guided by one fundamental principle: to protect the health and safety of our employees.