From what this book states, THF levels do not matter at all for the FIGLu urinary markers. The simple folic acid form's function is to accept a carbon group in the FIGLu reaction. This is all a little too complex to fully understand, but it very plainly says that THF levels have no bearing on lowering or increasing FIGLu levels. You don't need methyl donors to lower FIGLu in the urine and if I am reading this right, it's biologically impossible to use THF to lower FIGLU.
Also what happens when one has been on high doses of B12 and THF with high FIGLu? Remember my test results are after at least 3 months of following these methylation block protocols, so I'm a little skeptical. Prior to the daily methyl B12 injections, I was taking bi weekly HydroB12 injections. I just don't see any reason for that marker to be high unless I just need regular folic acid.
Hi, Calico13.
I hope you will understand that I am trying to be helpful, not argumentative. I can understand why you might be a little skeptical, given your experience up to now.
I think I need to clarify something. When I mentioned THF, I was referring to tetrahydrofolate. That's not the same as methyltetrahydrofolate. It's a simpler folate form, without the methyl group. It's true that methyltetrahydrofolate does not react with FIGLU, and I think that's the point the Metametrix handbook is trying to make. However, tetrahydrofolate most assuredly is the form of folate that does react with FIGLU. And folic acid has to be converted into tetrahydrofolate before this reaction can take place. If you would like references for this, I can supply them.
As I wrote before, if all you had was high FIGLU, and not also high MMA, and if you were fortunate enough to have inherited a fast form of DHFR, then yes, folic acid would likely do the job for you, just like the Metametrix handbook says (I also have a copy of it, as well as the book by Lord and Bralley upon which it's based). However, you also had elevated MMA, and given that, it's likely that you still have a partial methylation cycle block, and will need both high-dose B12 and a reduced form of folate, preferably both folinic acid and 5-methyltetrahydrofolate.
So why didn't the three months of treatment correct this partial block? There are several possibilities. Assuming you were using high enough dosages of the proper forms of B12 and folate, then here's something I posted recently to the Yahoo CFS_Yasko group that may apply to your case:
"First, for the people who can tolerate the treatments but do not experience benefits from them, I suspect that the likely causes are that the methylation cycle and related pathways do not have all the nutrients they need to come back up to normal operation. These include amino acids (especially methionine, serine, glycine, glutamine, and cysteine), vitamins (especially the other B vitamins and vitamin C), and certain minerals (especially zinc, copper, magnesium, manganese, selenium and molybdenum). These deficiencies could be at least partly caused by dysfunction of the digestive system, and I think that there is a lot of potential in working to fix the gut problems. I think the biofilm treatments and Dr. de Meirleir's most recent gut work are things we should pay attention to here. I think the KPU or HPU that Dr. Klinghardt has emphasized comes in here, too, in some cases, depleting zinc, B6 and other nutrients."
As I noted in my comments on your NutrEval results, there were some indications of deficits in some of the vitamins and essential minerals. Perhaps that explains the lack of improvement on the treatment you underwent.
Of course, you are perfectly free to try taking folic acid. As I mentioned, Dr. Vinitsky advocates that, and he recommends a pretty high dosage. As you also may have noticed in the Metametrix handbook, there is some published evidence suggesting that folic acid can increase the risk for cancer in certain cases, though there are other papers concluding that it does not. We have discussed these reports on this forum in the past.
I hope this is helpful. I know that it must be frustrating to go through all of this.
Best regards,
Rich