"clinically proven to relieve cough and cold symptoms"Wondering what "clinically proven" meant I headed over to Helixia's webpage and found their references section. There I learned that the "clinical proving" came primarily from studies conducted in the early 1990s and unfortunately, they were all published in German. The one item not published in German wasn't actually published and was described as, "internal data" and was sourced to South Korea.
That said, I was able to find a recent English language systematic review regarding the use of ivy leaf (the active ingredient in Helixia) on coughs and colds (I could not find any English language papers actually on Helixia in medline). It was published in the journal Evidence-Based Complementary and Alternative Medicine in 2011 and I will highlight their conclusion here,
"Although all studies report that ivy extracts are effective to reduce symptoms of URTI, there is no convincing evidence due to serious methodological flaws and lack of placebo controls."I often wonder how health professionals with conflicts sleep at night. That wonderment extends to the folks who have set up Canada's Natural Health Product Directorate as they're the very folks involved in clearing products like Helixia for the market (and for marketing).