Thin product pages built on manufacturer copy fail to index because the same description appears on dozens or hundreds of other retailers, so a search engine sees no unique value on your version and picks one canonical to represent the lot, and that chosen page is rarely yours. This is a duplication-selection problem, not a punishment. When identical text fills the internet, the engine does not want to store and serve the same content many times over, so it consolidates: it identifies the duplicates, selects a single representative, and leaves the rest out of the index. Your page is competing against every other shop selling the same item with the same words.
The reason it usually is not your page that gets selected comes down to the signals around the duplicate. The engine tends to favor the version with stronger authority, more links, deeper trust, or a longer track record on that exact content, often the manufacturer’s own site or a large established retailer. If your store is smaller or newer, your copy of the shared text loses the selection by default, and the page simply never enters the index, no matter how technically clean it is.
It helps to be precise about what is not happening here. There is no penalty for using manufacturer copy. The engine is not flagging you, demoting your domain, or marking the page as spam. It is making an efficiency choice, deduplicating near-identical content and serving one copy. Treating this as a penalty leads people to chase the wrong remedies, disavowing links or fearing a manual action, when the actual issue is that their page offers nothing the chosen canonical does not already have.
Because it is a value problem, the fix is value. Add genuinely unique content to the pages you need indexed: original descriptions written in your own words, real specifications you verified, honest pros and cons, usage notes, sizing or compatibility guidance, photos and reviews from actual customers. The moment your page says something the duplicate set does not, the engine has a reason to index it on its own merits rather than fold it into someone else’s.
Pick the products that actually matter to your business and rewrite their pages so the copy is yours and nobody else’s, then let the long tail of low-stakes SKUs wait. Replace borrowed text with real, specific, unique content on the pages you need to rank, and you give the engine the reason it needs to keep them.