VIDEO ANSWER
"Natural" doesn't mean regulated: the real problem
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Now, what I want you to understand. The problem with phytotherapy isn't that it's natural, the problem is that it's not regulated like a medicine, it doesn't pass the same quality controls.
What the label says doesn't always correspond with what's inside the bottle. The concentration of the active ingredient varies from one batch to another, from one brand to another.
Neither the FDA nor the, nor the European Medicines Agency regulate it as a drug, but as a food supplement.