Folate, B12, and taurine and dementia risk

"…prospective epidemiology has associated low dietary or plasma levels of folate, B12, and taurine with increased dementia risk.

Rodent studies suggest that effective nutraceutical strategies for boosting brain H2S synthesis may in fact have broad neuroprotective utility, possibly aiding prevention and/or control not only of AD but also Parkinson’s disease and glaucoma, while diminishing the neuronal damage associated with brain trauma or stroke."

But would an additional supplementation of folate, B12, and taurine mitigate the risk? What would be the best form of folate and B12 to take? (MTHF and methyl- and adenosylcobalamin, I guess)