I've been meaning for weeks to write a short post on this topic because it's gotten ridiculous. The issues are multi-faceted:
First off are the fake reviews, the paid reviews, and the review of products that were provided as free goods in exchange for a review. I'm not going to sugar-coat it- It's all bullshit. The reviews are garbage pulled out of thin air and some (Many?) people are such sheep they read them as gospel and reinforce the scam by supporting the businesses with their purchases. The nutritional supplement reviews on Amazon are rife with this crap.
Secondly is the increasing barrage of contacts made to me by so-called professional Amazon Reviewers. It's become an epidemic. These folks attempt/purport to analyze the value-proposition of a product and compare it to other similar products. It's not 100% BS here, a small handful of these folks are well-intentioned, fair, objective and serve as a healthy unbiased check/balance in regards to disclosure and claims and for that I'm appreciative as it can help sort out the good from the bad.
A big challenge for me and my customers is when a reviewer presents a "cost per dose/serving" calculation. I'll excerpt a response in part of a email discussion with a ("good") reviewer:
"Now, let's get to the complexity part of my reply. I'm especially sensitive to the issue of cost/dose. In fact, the past few days I've been having quite a row with a popular and well-followed "Amazon Reviewer" who provides these calculations in his reviews. The problem, the fatal problem with these calculations, is the fact the calculation is not corrected for product purity or form (as the specific case may be).
For example, EgCG. I use a raw material which is amazing. Standardized to level of purity and strength that exceeds any other product that I am aware of. A consumer gets a high level of catechins and polyphenols in a relatively small mg dose that is exceptionally well tolerated.
Another example is R-Lipoic acid, specifically the Na-R-ALA form which is bound to a sodium salt as a (necessary) carrier and stabiliser. I correct for the Na content and my 100mg dose is actually a 125mg capsule fill of raw, and I disclose that on the label. Not to mention that R-lipoic is 100% bioavailable vs only 50% of Alpha-lipoic (racemic molecule, S-form is not bioavailable, only R-form).
Another example is my Bacopa product, like the EgCG, standardized to the highest percentage of purity of any product I know of. It requires much less mg fill, yet is an astronomically expensive raw. If a correction is not applied to cost/dose to recognize this then the calculation is flawed and my product can appear to be "overpriced."
I'll also note that in regards to the EgCG and Bacopa for example, the high quality and lower overall mgs fill necessary to offer a very-high active content provide the added benefit to consumers of excellent tolerability compared to other suppliers products. Both materials (if from other manufacturers) frequently result in gastrointestinal upset for people, my products almost never do. That is critical informational input to an overall value-proposition consideration, yet not captured in a cost/dose calculation.
Another example which is particularly frustrating for me is K2, both MK4 and MK7. On this material, one must know the percent of "Cis-Form" of the material used by the manufacturer so as to apply a correction factor, because Cis-form (vs the active and bioavailable Trans-form) is not bioavailable (active) to humans. Think of it as sawdust added to your oatmeal, or saline added to a persons insulin injection. No one discloses it, but I will be the first and only (to my knowledge?) to disclose it on my new K2 product labels.
Ditto with my Lutein, Advanced Hexose Correlated Compound, CurcuWin, Lion's Mane (hericium), they are all very unique raw materials and formulations. I could go on but we both have limited time and I think I made my point with gusto...lol.
Unfortunately, the "reviewers" also include some epic fails, people asking me the most offensive and ridiculous questions, with no qualms to waste my time for no good reason. Almost 100% of them include no personal information about themselves, to which I ask, who the hell are you and what are your qualifications to think you can judge my business? To you I say- I have a track record of public communication, quality products and very happy customers going back a decade, I don't need or want to deal with you. My business and product reputation is well established.
I could go on for a while but I think this captures the essence of the challenges posed to nutritional supplement manufacturers (me) and "Amazon Reviewers". A complicated relationship.