When I typically inject affiliate marketing products into my site, I copy the text and the pictures that the affiliate distributor website provides. I'm assuming this text and pictures is exactly the same as the other hundred, or thousand, website owners that wanted to install those same products on their website to generate some commission sales. Because the content of these entries is the same, and search engines don't like your site if there's content directly copied from another...will entering affiliate marketing products on my site have a negative impact upon my SEO???
if your most content is unique than i think will not effect much but you can make the affiliate content by changing some words in it for sure
Google knows what a product page is and will rank it accordingly. Don't worry about the duplicate descriptions - just make the rest of your site unique and robust for users.