No, Amazon mixes inventory. You should not trust Amazon with anything that is expensive or you put into your body. A product gets high ratings and is successful, then counterfeiters flood the market with a fake product that you end up inadvertently buying.

A recent example is Eclipse glasses that were purchased on Amazon. Since the inventory was co-mingled and Amazon doesn't have the time or expertise they refunded most purchases of the glasses both from legitimate and illegitimate sellers.

I could be mistaken, but my understanding is that there is no indicator if comingled inventory is enabled or disabled for a SKU, and that even product sold “by Amazon” could be comingled.

https://news.ycombinator.com/item?id=13926015

That is no guarantee it seems, even for really expensive items.

Go to Youtube and search for "chaseontwowheels" and "rocks", you'll see an interesting story in three parts about a guy trying to order a high end camera from Amazon.

I've received counterfeit electronic goods from a Chinese third-party seller before.