I take various supplements.
Healthline.com seems to have an extensive library of reviews on many herbal supplements.
They appear to be objective because for some herbal remedies, they promote them quite heavily as having numerous health benefits and minimal risks.
I remember another supplement they were warning about - ginseng, which is now added to Red Bull, etc ...
This site does not warn against all non mainstream supplements at all. So if there is a particular warning about excessive risks with sth, I am cautious to use it.
They reference scientific studies, and in the case of colloidal silver, they claim the science isn't solid.
But by all means, cross reference any information with sites you trust.
But keep in mind the same racket occurs as with Big Pharma, ie people get paid to sell supplements and sometimes they won't tell you the risks if they are lining their pockets.