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Even where a herb has good evidence behind it, that evidence belongs to the plant and not to the bottle in your hand. Testing keeps turning up products that do not contain what the label says.
This part of the argument does not depend on whether herbal remedies work. You could accept every claim made for a plant and still be left with the problem that you cannot tell, standing at the till, whether the capsule contains it. So the question worth asking is not only does this work, it is has anyone checked what is actually in it.
Qur’an and Sunnah
Let man consider the food he eats (Quran 80:24). The instruction assumes you can know what you are taking in, and that is exactly what an unchecked supplement does not allow.
فَلۡيَنظُرِ ٱلۡإِنسَٰنُ إِلَىٰ طَعَامِهِۦٓ
Let man consider the food he eats
Qur’an 80:24read it in the library
Translation: M.A.S. Abdel Haleem, The Qur'an, Oxford University Press, 2004.
What the research says
How much the exact substance matters is clear in the omega-3 literature. One meta-analysis identified EPA specifically, rather than omega-3 in general, as the component associated with antidepressant benefit. So even inside one well studied family of compounds, which molecule is in the capsule changes the answer. An unverified product leaves you guessing about precisely the thing that decides the result.
Sublette ME, Ellis SP, Geant AL, Mann JJ. (2011). Meta-analysis of the effects of eicosapentaenoic acid (EPA) in clinical trials in depression.. The Journal of clinical psychiatry doi
Strength of evidence: one line of research. A single study, or a theoretical account.
Why it works
A result from a study only carries over to you if what you swallow is the same thing that was studied.
This one is still a draft. It is waiting on a scholar and a clinician to read it before it is published.
Near this one
Irritable bowel symptoms turn up more often in people with ADHD, and they tend to track stress. If your stomach is at its worst in the weeks when everything else is at its worst, that is information rather than coincidence.
Pick one small change and leave the rest alone. A full overhaul asks the most of you at the point when you have the least to give, and it usually collapses in the second week.
If you are going to buy supplements, look for an independent verification mark: USP Verified, NSF, or a product tested by ConsumerLab. It is the nearest thing available to the check that regulators do not carry out.