The problem
A product page has one job and reviews are the part of it most often placed badly. At the foot of the page, below related products, they are read by the few who scroll that far — and those people had already decided.
The hesitation happens at the price, which is where the evidence needs to be.
What actually works
Put reviews beside or immediately below the add-to-cart area. A rating and count near the price, with the reviews themselves either expanded there or one click away in a popup.
On a catalogue or collection page, a star rating under each item does the equivalent job — it is what makes a shopper click one product rather than another.