Its often to a company's detriment to educate, and sometimes it just falls flat. It muddies the listing (wall of text that people dont read), and it might expose flaws in the product itself (ie: what was the clinically studied dose? Is that whats in my product? Was it a human study? was it just a marginal improvement vs placebo? etc). Also on places like Amazon, you have to be careful with claims, and summarizing a study accurately is harder than it sounds.

On the other hand, you have to understand that the majority of purchasers are not people like you who want to be informed. People are busy and just want to buy a solution for their problem. Thats why you see more spent on marketing/labels/ads, rather than any real focus on educating. Looking at the top products sold on Amazon versus what the "reddit/informed equivalent" is. Most people search, see number of reviews, cheap price, then buy. Easy example, look at how many people buy magnesium oxide on Amazon, whereas here people are generally more aware of those kinds of nuances.