High homocysteine concentrations causes brain toxicity which can lead to memory problems and (thereby and on its own) psychotic symptoms.

All the supplements are neuroprotective, counteracting the toxicity directly by helping to increase the speed by which homocysteine is metabolised to be like that of most people, or indirectly (there being many causes of toxicity).

Many/all meds for BP do the same, but maybe such supplements are enough.

I see meds as a necessary evil in many cases, but definitely not for life. The biggest problem I have with psychiatry is not the meds (there is that) but that they tell us we are the ones with the problem, not (everyone in) society. It teaches us to fear our BP, not to embrace the less extreme aspects of it. It makes us (feel) disabled, not just different.