MANY HERBAL PRODUCTS FOUND TO HAVE QUALITY ISSUES
Essentially, herbal remedies consist of portions of plants or unpurified plant extracts containing several constituents which are often generally believed to work together synergistically. The recent resurgence of public interest in herbal remedies has been attributed to several factors some of which include (i) various claims on the efficacy or effectiveness of plant medicines, (ii) preference of consumers for natural therapies and a greater interest in alternative medicines, (iii) erroneous belief that herbal products are superior to manufactured products, (iv) dissatisfaction with the results from orthodox pharmaceuticals (v) high cost and side effects of most modern drugs, and (vi) a movement toward self-medication.
A review of 46 studies on 727 herbal products showed quality problems including large variations in chemical composition that ranged from absence of the expected compound to unnaturally high concentrations.
(Did You Know? The classification of many herbals as food or dietary supplements is the reason why there is little regulation.)
Adverse events related to herbal products are due to improper use or poor product quality. Other specific quality issues included poor-quality or misidentifying herbs; incorrect processing, manufacturing, and storage methods; and contamination of starting materials or products.
These variations not only make it difficult for consumers but also for there to be effective studies on these supplements. Quality control can only help both of these factors.
– Tuft’s Health & Nutrition Letter and National Institutes of Health