I wouldn't recommend buying anything health-related on Amazon due to inventory commingling and their complicity with counterfeiters. As a rule, unless you have

I wouldn't recommend buying anything health-related on Amazon due to inventory commingling and their complicity with counterfeiters. As a rule, unless you have the skills and equipment necessary to evaluate the legitimacy and safety of the product you receive, don't buy it. For electronics it's usually pretty easy for us HN users, but for this kind of product you'd need an entire lab to be able to tell whether what you got is actually real (and safe) or a knockoff/contaminated/expired.