As of September 2021, Google will allow more covid-related products that were previously not allowed back on the advertising network.
These products are clothing, home goods, test kits, etc.
Covid-19 home test kits that are approved by the FDA or local governing body are allowed. So make sure to check with your government to know if these are approved or not. Products that perform the test at home or where a sample is sent to a lab for analysis are allowed.
Regardless of whether you can advertise these products or not, make sure you comply with your local countries’ laws before submitting the products.