Is it effective to include keywords within product descriptions for SEO?

Keywords help the user, which means including keywords within your product and service descriptions is a recommended best practice.

There is no evidence that keywords in either the GMB product or service sections directly increase rankings for those keywords.

However, adding information to those fields can help users find out more about your business before they visit your website. Writing descriptions for a user is the most important takeaway here.

Also, note that the more user engagement a listing has, the better it will rank. So getting people to click on your service or product offers can help general rankings in the long term, but it is not specific to the keywords used in the descriptions.