What percentage of reviews on Amazon are fake?

According to the 2018 findings on Amazon, the category of products that recorded the highest rate of fraudulent reviews (64%) was the supplements category. Electronics was the second category with 61%.

Source: Report Fake Amazon Reviews | How To Fight Back Against Fake Negative Reviews

If you receive an email solicitation to write a fake review – such as vendors who offer to give you a free product in exchange for a good review – you can forward the email solicitation to community-help@amazon.com