Honestly, this Gift of Fa.Vihado I begeistert.Nehme it now only 4 weeks and since then my knee pain (arthritis) have become less and I have such a power that it almost surprises me. Super I find the high concentration of OPCs in other manufacturers usually much less. For this the reasonable price, unbeatable. I'll take it in the long term continues because I have a feeling I hereby do something good.