The poster pointed out in a comment that this was listed as “Sold By” a random 3rd party seller called “Ramwest”. Amazon’s interface doesn’t make it easy to see this, but if you’re worried about the products you’re buying, always check for this info in the “buy box”.
Even that can still be annoying to check unless it's sold by amazon, I've seen several manufacturors point to amazon listings sold by "company name", but I've also seen some cases where some 3rd party seller listed their company name as "company name USA" that weren't where people were getting counterfeit.
I've pretty much stopped buying health products from amazon, as even buying "sold by amazon" they'll mix in 3rd party sellers products and you're at the mercy of luck on getting the real deal.
Amazon's co-mingled inventory really does mean you have no idea who you're getting a product from. It could be sold from Amazon in your order, and you can still get a knock-off because they're mixed in with the genuine products.
I've pretty much stopped buying health products from amazon, as even buying "sold by amazon" they'll mix in 3rd party sellers products and you're at the mercy of luck on getting the real deal.