I think methyl B-12 can be beneficial for high testosterone persons who can't methylate their own B-12. This will help regulate homocysteine and produce glutathione.

I'm not sure how much methylcobalamin contributes to the production of methly-mercury and it's hard to know if the benefit outweighs the risk. There are mixed positions on that.

But again, my best guess is that - in some people, it would be more beneficial (high testosterone) and in others it may be more detrimental.

In the end, we probably don't have enough hard data to be sure. I have no amalgams but am being exposed to regular mercury via chemtrails and I do use methyl B-12 about 5 days a week.

Hope this helps.