>>21880B12 and iron are a necessity (too much monthly blood loss, vegetarian diet).
Magnesium in case of insomnia, and also for dreams (it has tryptophan and L-theanine with it).
Probiotics.
Vitamins (especially D) during winter.
In the past, I have played with weird stuff in the hope of lessening the blood flow, but it just disrupted cycles and actually increased it lol.