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A second study, this time of 44 products, found only about half were authentic. Roughly six in ten were mislabelled, three in ten contained a substituted ingredient, and one in five held contaminants or fillers.
One study of this kind is a story about some bad batches. Two independent studies finding the same thing is a description of how the market works. That changes what you do with the information. It is not avoid this brand, it is assume nothing about any product that has not been independently tested.
Qur’an and Sunnah
Watch their fruits as they grow and ripen (Quran 6:99). Looking more than once, over time, is the kind of attention being commended.
وَهُوَ ٱلَّذِيٓ أَنزَلَ مِنَ ٱلسَّمَآءِ مَآءࣰ فَأَخۡرَجۡنَا بِهِۦ نَبَاتَ كُلِّ شَيۡءࣲ فَأَخۡرَجۡنَا مِنۡهُ خَضِرࣰ ا نُّخۡرِجُ مِنۡهُ حَبࣰّ ا مُّتَرَاكِبࣰ ا وَمِنَ ٱلنَّخۡلِ مِن طَلۡعِهَا قِنۡوَانࣱ دَانِيَةࣱ وَجَنَّٰتࣲ مِّنۡ أَعۡنَابࣲ وَٱلزَّيۡتُونَ وَٱلرُّمَّانَ مُشۡتَبِهࣰ ا وَغَيۡرَ مُتَشَٰبِهٍۗ ٱنظُرُوٓاْ إِلَىٰ ثَمَرِهِۦٓ إِذَآ أَثۡمَرَ وَيَنۡعِهِۦٓۚ إِنَّ فِي ذَٰلِكُمۡ لَأٓيَٰتࣲ لِّقَوۡمࣲ يُؤۡمِنُونَ
It is He who sends down water from the sky. With it We produce the shoots of each plant, then bring greenery from it, and from that We bring out grains, one riding on the other in close-packed rows. From the date palm come clusters of low-hanging dates, and there are gardens of vines, olives, and pomegranates, alike yet different. Watch their fruits as they grow and ripen! In all this there are signs for those who would believe
Qur’an 6:99read it in the library
Translation: M.A.S. Abdel Haleem, The Qur'an, Oxford University Press, 2004.
What the research says
Pooling separate studies is how researchers tell a real pattern from a fluke, and it also shows where results disagree. An early meta-analysis of double blind placebo controlled trials found a significant antidepressant effect of omega-3 while flagging substantial variation between the trials it pooled. Repetition strengthens a finding, and the spread between studies is part of what you are meant to look at.
Lin PY, Su KP. (2007). A meta-analytic review of double-blind, placebo-controlled trials of antidepressant efficacy of omega-3 fatty acids.. The Journal of clinical psychiatry doi
Strength of evidence: one line of research. A single study, or a theoretical account.
Why it works
A finding that repeats in a separate sample is usually telling you about the system rather than about one supplier.
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
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.
Water, sleep, food and digestion are not the boring preamble to the real work. When those are running badly, everything else you try has less to work with.
Put a rubber band round your water bottle for each refill you want to get through today, and slide one off each time you finish it. Nothing to remember, nothing to buy, and you can see where you are at a glance.