In November 2025, Amazon and L'Oréal USA filed a joint lawsuit against a network of sellers who had been shipping counterfeit CeraVe products to customers through Amazon's own platform. The products looked right. The listings were fulfilled by Amazon. Customers had no obvious reason to suspect anything was wrong until L'Oréal's brand protection team flagged the problem after an extensive investigation. Amazon blocked the accounts and issued refunds, but only after the counterfeits had already reached buyers.
That case is not an outlier. Amazon seized more than 15 million counterfeit products in 2024 alone, according to the company's own Brand Protection Report (Amazon, March 2025). The scale of that enforcement effort is impressive. It also tells you something about the volume of fakes circulating in the system at any given moment.
Third-party sellers now account for the majority of units sold on Amazon. Most of them are legitimate. The problem is that the platform's design makes it genuinely difficult to tell the difference between a trustworthy independent seller and one that is cutting corners, sourcing gray-market goods, or operating as a pure dropshipper with no inventory or accountability. This guide breaks down the specific risks and what signals to look for.
The "Fulfilled by Amazon" Badge Doesn't Mean What You Think
The Prime badge and "Fulfilled by Amazon" label create a strong impression of Amazon accountability. The product is in Amazon's warehouse. Amazon handles shipping. If something goes wrong, Amazon will sort it out. That impression is partially accurate, but it papers over a meaningful gap.
Amazon warehouses products from hundreds of thousands of sellers. When a seller sends inventory to a fulfillment center, Amazon historically commingled identical products from different sellers into shared bins. A customer buying from Seller A might receive a unit originally sent by Seller B. If Seller B sourced counterfeit or substandard goods, the customer gets them regardless of which seller they chose.
Brands were aware of this problem. Amazon estimated that companies spent approximately $600 million annually re-stickering and re-labeling products specifically to opt their inventory out of the commingled pool (Amazon, September 2025). That number reflects the true cost brands assigned to the contamination risk. Amazon announced it would end the commingled inventory program effective March 31, 2026, citing both the cost burden on brands and the diminished speed benefits as its logistics network matured. For purchases made before that date, the risk remains.
Counterfeits Reach More Buyers Than Most People Realize
A 2023 study from Michigan State University's Center for Anti-Counterfeiting and Product Protection found that almost 7 in 10 consumers were misled into purchasing a counterfeit item online at least once in the prior year (MSU, 2023). E-commerce platforms accounted for 39% of those purchases. Most buyers did not know they had received a fake until after the fact, if they ever found out at all.
The categories most affected are predictable: electronics accessories, skincare, supplements, apparel, and baby products. These are high-margin categories with lightweight items that are easy to manufacture cheaply and ship internationally. The CeraVe lawsuit is one high-profile example, but the same dynamics apply to a USB-C cable that charges slowly and fails at six months, or a supplement whose elemental content does not match the label.
BuyWise recently analyzed a supplement listing on Amazon with a D-grade that had 52% suspicious reviews out of 21 total. The listing carried flags for keyword stuffing and a generic product description, both common signals in listings where sellers are working to move inventory quickly rather than establish a credible product identity. The high rating on that listing was, in the analysis, significantly inflated by reviews that appeared to misunderstand what the product actually contained. A buyer relying on star rating alone would have no way to know that.
Safety Hazards Are Part of the Risk Profile
Counterfeit skincare is annoying. Counterfeit safety equipment is dangerous. In July 2024, the U.S. Consumer Product Safety Commission ruled unanimously that Amazon qualifies as a "distributor" under the Consumer Product Safety Act and is liable for hazardous products sold through its FBA program (CPSC, July 2024). The ruling addressed more than 400,000 products that posed a substantial product hazard, including children's sleepwear that failed flammability standards, carbon monoxide detectors that did not properly alert users, and hair dryers lacking electrocution protection.
The Commission found that Amazon had not adequately notified consumers about the hazardous products or taken sufficient steps to encourage returns. Those products were sold through third-party listings, many fulfilled by Amazon. The CPSC ruling matters because it established regulatory accountability, but it does not retroactively protect the buyers who already received those products before the decision.
Return Policies Are Not Standardized
Amazon's A-to-z Guarantee covers third-party purchases in many situations, but the process is not as frictionless as returning something sold and shipped directly by Amazon. Return windows vary by seller. Some categories are explicitly excluded. International third-party sellers may require you to ship items back at your own cost to an overseas address, making small-value returns economically pointless.
Before buying from a third-party seller, scroll past the "Add to Cart" button and find the seller name and their individual return policy. It is a separate policy from Amazon's. Check three things:
- The return window length and whether it applies to your product category
- Whether the return address is domestic or international
- Whether the seller is responsible for return shipping costs or requires you to cover them
If a return would cost you more than the item is worth, factor that into the effective price before you buy.
Dropshipper Red Flags Worth Knowing
A significant portion of problematic third-party listings are operated by dropshippers: sellers who do not hold any inventory and instead forward your order to a manufacturer or wholesaler, often overseas. Dropshipping itself is not inherently fraudulent, but it introduces a layer of separation between you and whoever actually made the product. Quality control is the supplier's problem, not the seller's, and the seller has little incentive to vet it carefully.
Common indicators of a dropshipper listing:
- Generic or templated product description with no brand-specific detail — often copied from a manufacturer spec sheet
- Seller storefront with dozens or hundreds of unrelated product categories
- Seller account that was created recently but already has a large volume of listings
- Product images that appear on multiple listings from different sellers (reverse image search helps here)
- Keyword stuffing in the title, often including competitor brand names or unrelated search terms
- Unusually long estimated delivery windows for a Prime-labeled item
Across 50 BuyWise analyses of Amazon listings, 22 flagged a high proportion of suspicious reviews — meaning 44% of analyzed listings showed meaningful signs of review manipulation. Listings with keyword stuffing flags showed up in the majority of lower-graded analyses. That pattern is consistent: sellers who game search rankings tend to also game the review system, because both are levers to drive conversions without actually improving the product.
How Platform Incentives Shape the Problem
In September 2025, Amazon agreed to a $2.5 billion settlement with the FTC over deceptive practices related to Prime enrollment (FTC, September 2025). Within the FTC complaint was a specific accusation relevant to third-party sellers: Amazon was accused of coercing sellers into using FBA by restricting the Prime Eligibility badge to FBA participants. That means the signal consumers use most heavily to assess listing trustworthiness, the Prime badge, was partly a function of whether a seller paid for Amazon's fulfillment service, not purely a reflection of product quality or seller reliability.
The structural incentive matters because it explains why the Prime badge should be treated as a logistics indicator, not a quality or authenticity signal. A third-party seller shipping a counterfeit product through FBA gets the same Prime badge as a legitimate brand selling genuine inventory.
What Actually Helps Before You Buy
You cannot eliminate the risk of buying from a third-party seller, but you can dramatically reduce it with a consistent pre-purchase checklist.
Check who is actually selling the item. The seller name appears near the "Add to Cart" button. If it says "Ships from and sold by Amazon.com," that is a first-party sale. Everything else is a third-party seller, regardless of whether it is Prime-eligible or FBA-fulfilled.
Read the seller's storefront page, not just the listing. Look at how long the account has been active, how many product categories it covers, and what the seller feedback score says. Feedback scores below 95% on a high-volume account are a meaningful signal. Very new accounts with no feedback and many listings are higher risk.
Look at the review distribution before trusting the star rating. A product with 4.6 stars but a significant cluster of one-star reviews describing authenticity problems or misrepresented contents warrants more scrutiny than the average does. BuyWise analyzes that distribution automatically, flagging the share of reviews that show signs of being generic, incentivized, or inconsistent with verified purchase patterns.
For categories where safety matters, including children's products, electronics with power components, and supplements, consider whether buying directly from the brand's own store or a major authorized retailer is worth the extra few dollars. The CPSC ruling in 2024 demonstrated that "sold through Amazon" does not guarantee the product meets the safety standards printed on the box.
The platform has made real progress on counterfeits. Fifteen million seized products and $1 billion invested in anti-counterfeiting operations annually is not nothing (Amazon Brand Protection Report, March 2025). But the volume of enforcement activity required is itself evidence that verified, safe products are not the default when you click buy on a third-party listing. Treating the marketplace as a tool that requires active use, not passive trust, is still the right posture.
