Yes, in fact I have not taken any B2 or MK4 for ages. I do not need them anymore. It seems that the RS and probiotics are doing their job.
Good for you. This would also of course effect MTHFR, which uses a FAD cofactor. This should occur in concert with all the other processes including the heme metabolism, and everything else effected by flavin coenzymes. I bet you wouldn't react to 5-MTHF today like you did in the past. Until people stop having "reactions" to B2, folate, and B12, their GIT has a ways to go.
Slowly but steadily getting better until I do something stupid like take something I am not ready to take yet.