My two sisters were tested for the MTHFR gene, one has it one has not. I am not sure if I want to know if I do or not. I've got chronic Lyme, and while I did experiement with Vit B-12 infusions, supposedly the right kind, they never did much for me. I'm in an okay place right now, but I do know it sneaks back and I will have long periods of feeling wiped out. I'm tired and very wary of doctors now, because my Lyme literate one was forced to retire by the State Medical authorities. I think I will go with an integrative doctor now if I can find one. But I also know all my long lived parents and grandparents took NO drugs, not even an aspirin, until their 90's...my poor father was the only one I couldn't prevent from taking the covid injection, and he died young. 96. That is young/before his time in my family. From sepsis.