I of course agree not enough research exists out there LONG TERM to back up the use of the vitamin patches. A four month post-bypass lab draw is not enough time to say they are working. I had read about a clinical trial on these Patches I think in 2016 or the very beginning of 2017 and there is no published data from that I have been able to find. So that can tell you how long testing needs to be done for. It is much easier to prevent a deficiency than correct one, so keep that in mind. We all wish there was an easier way but why is there no long term vet than can speak to the efficacy of these patches? Likely because they don’t use them and right now, there is a reason for that.