... on my quite severe neuropathy (burning foot soles, stabbing pains, RLS) has been good. Instead of driving me crazy around midnight, it has become bearable. During the 2 years, I have had different versions of capsules made by three different manufacturers or different batches, as can be told from the markings. Two versions were effective and one felt like I took nothing. I tested this out several times by going back and forth between versions to confirm the effect. Two weeks ago I received a fourth version and after testing again by switching back and forth, I have the same problem again that this version seems to not work well. Is it possible to have such a variability depending on the manufacturer or the batch, or am I loosing it?