In short
Yes, in three specific ways rather than as a general ranking boost. Reviews put shopper vocabulary on a page that would otherwise carry only supplier copy, they let a product page qualify for rating stars in search results through valid Product structured data, and they give AI assistants something to summarise when a shopper asks what real buyers say. None of that is automatic: the review text has to be crawlable in the page HTML, the markup has to match what is visible, and the ratings have to be genuine.
Reviews add the one thing a product page usually lacks: other people's words
Most product pages are written by whoever sells the product, which means they describe the item and not the situation the buyer is in. Reviews fill that in. They mention the dog that chewed the last one, the narrow foot, the small kitchen, the humidity, the gift that arrived late. That is language nobody in the business would write, and it is the language people search with.
That has a direct effect on which queries a page can match. A tent page written by a brand talks about denier and hydrostatic head. Its reviews talk about condensation, two adults and a dog, and whether it fits on a platform pitch. Long-tail queries land on pages that contain the phrasing of the question.
Reviews also keep the page changing without anyone editing it. A product that collects a few new reviews a month is a page that has fresh, relevant content added by the people best placed to add it, which matters most in categories where the product itself does not change year to year.
Star ratings in results come from structured data, not from installing a widget
Rating stars appear when Google can read an aggregate rating inside valid Product structured data on the page and decides to show it, and that decision is never certain. Two things have to be true first: the rating and review count must be present in the markup, and the same rating must be visible to a person looking at the page. Markup that describes reviews the visitor cannot see is a policy problem, not an optimisation.
The common failure is technical. Many review apps render their content in JavaScript after the page loads, and some inject the structured data into a widget that a crawler may render late or not at all. If the rating is not in the HTML that Google processes, the stars never appear no matter how many reviews the store has collected. Testing a live URL in Google's rich results tooling and checking the enhancement reports in Search Console tells you which situation you are in.
Ratings for Shopping surfaces work differently again. Product ratings alongside free listings and Shopping ads come from review data supplied to Google, typically through an approved review aggregator or a product review feed, and they need a minimum number of reviews before anything shows. A store can have stars on its own product pages and none in Shopping, or the reverse, because the two are fed separately.
Review text is keyword research you already own
Read the reviews before writing anything for the category. Export them, sort by product line, and look for the words that repeat: the sizing complaint, the comparison shoppers keep making, the use case nobody in the business had thought about. Those phrases belong in the product description, the collection page introduction and the FAQs, because they are evidence of demand rather than guesses about it.
The same material answers questions on other surfaces. When a shopper asks an assistant whether a jacket runs small or whether a stand fits a particular monitor, the answer exists in your reviews, and a page that states it in plain text near the specification is far easier to draw on than one where the information is buried in review number forty-one.
This is also the cheapest way to find product problems that are costing conversion. A repeated note about confusing assembly instructions is a returns and CRO issue first and a content issue second, and both are worth acting on. Reviews are the only place in the store where the reasons behind a return rate are written down by the people who lived them.
Where review setups quietly fail
The most common problem is invisible reviews. If the app loads content only when a shopper clicks a tab, and the content is fetched at that moment, there may be nothing in the page for a crawler to index. Ask for the reviews to be present in the server-rendered HTML, or at minimum rendered without interaction, and confirm by looking at the rendered page in Search Console's inspection tool rather than in the browser.
The second is markup on the wrong page. Aggregate rating markup belongs on the product page that carries the reviews. Putting it on a collection page, a homepage or a page about the business as a whole does not qualify for product rich results and can trigger a manual action for structured data that does not match the content.
The third is provenance. Reviews collected in exchange for payment, filtered so only positive ones publish, or imported from another product break both platform policy and consumer protection rules in Canada and the United States. Syndicating reviews from a manufacturer across many retailers is permitted in some programs and not others, so check the terms of whichever review provider and shopping surface you are using rather than assuming.
The fourth is language. On a multi-market store, reviews written in one language on a page targeted at another market help neither ranking nor conversion, so keep review display consistent with the locale of the page.
Related questions
Do reviews on third-party sites help my product pages rank?
Not directly, since the content sits on someone else's page. They still matter commercially, because assistants and shoppers researching a brand read them, and Google can use reviews collected by approved partners for the product ratings shown on Shopping surfaces. Treat them as reputation and Shopping inputs rather than as on-page SEO.
How many reviews does a product need before stars can show?
For rich results on your own product page there is no published minimum, and a single valid review can be enough for eligibility, though display is never certain. The product ratings shown next to Shopping listings do have a threshold that Google applies at the product level, which is why a new product often shows no rating even when the store has plenty overall.
Should review content be paginated or loaded on one page?
Keep the first batch in the initial HTML and paginate the rest with real URLs or a crawlable link, rather than loading everything at once. That way the page stays fast on a phone and search engines can still reach older reviews. Avoid setups where every additional review is only reachable by clicking through a script.