It seems to be still boosting my dopamine 8 months after I quit taking it then. In all honesty, I think the methyl-B12 had as much to do with it as the SAMe. B-12 has been shown to have a strong effect on sleep cycle timing for certain individuals and there was a doctor on reasearchgate discussing several people who experienced insomnia as an adverse reaction to the two taken together.
https://www.researchgate.net/post/Can_too_much_vitamin_B12_cause_insomnia
That’s why I think it’s so important to consider stories like those of people with an adverse reaction to excessive D3. Messing around with megadoses of these vitamins can apparently make the life of someone with our condition much worse. In fact, it probably isn’t a good idea for those among the general population to megadose vitamins either.