I mean, maybe Moringa Oil is amazing (I doubt it). It's available for much cheaper than the listed amazon link: https://www.vitaminshoppe.com/p/cold-pressed-rwandan-moringa...
The price point on amazon is ridiculous though...makes me want to get in the business of packaging and selling this product in the future (not specific to covid).
There aren't very good studies for basically anything in medicine (let alone outside of medicine). Triple/Double-blind large studies are expensive in the extreme. We don't have strong evidence for the majority of things we do.
Recent examples might be mamograms causing more cancer than it detects and stents, it turns out, are no better than a placebo.
Therefore, the lack of a decent studies isn't in itself that interesting. Neither is it illogical for people to turn to old wives tales for knowledge because the filter of history on the knowledge is more powerful than retail medicine in terms of anecdata.
We forgot about it until I was gasping for air and then my wife remembered and we had some laying around. I could breath again in about 20 minutes. My chest and lungs still hurt until today.