Hi, it seems people who can't process Methyl-B12 can use Hydroxy-B12 with less issues and push it to a higher dosage. What is not entirely clear to me is what is really the difference... Let's say I can't tolerate 1mg Methyl-B12 but I can tolerate 4mg OH-B12... In theory a good part of the latter should be turned into Methyl-B12 anyways and I thought I should get the same side effects. What I understand from Dr.Lynch is that some people cannot tolerate extra Methyl groups, therefore the difference would be that OH-B12 gets methylated by already existing methyl groups instead of adding more by taking the Methyl-B12 directly. Is this correct, or am I making it too simple? It also seems that OH-B12 helps people with high oxidative stress, whereas too many methyl groups can raise nitric oxide. It's quite complicated subject... if you have any clue, please let me know.