I agree with many of these supplements but the dosage is often sorely lacking. An example is Bitter Gourd (ampalaya) leaves in tea bags or extracts in tablets of whatever form.
This is a far cry from my recommendations which are often at least 20 times more. (1 tea bag as against 1 bundle of leaves)
While many patients react to different meds differently, the natural supplement market is unfortunately, its own negative promotion by not encouraging increase in use, lowering of prices, and an awareness and proper study of the product involved.