“There are special standardized extracts for herbal supplements that guarantee a certain percentage of active ingredients, which is very important, since the effect of the plant extract depends on it. And from experience I can say that herbal supplements with standardized raw materials work great and show a predictable effect,” the expert also says. And he continues: independent organizations that have a good reputation and authority (the same Consumer Labs) regularly check supplements of popular brands, it is not difficult to look at this data. You can also find the certificates mentioned above right on the packaging of supplements. There are plenty of quality brands, they have been around for a long time (many for decades), have been tested in practice many times and have never made anyone doubt their quality.