I wonder about the following: Leucovorin is most often given in the form of Leucovorin calcium. That is interesting, because calcium is needed to regulate the release of dopamine in the brain. And this might also help with autism:

https://news.ki.se/new-study-links-dopamine-to-autism-sympto...

However there is also Leucovorin sodium.

Are there any studies that compare Leucovorin calcium vs. Leucovorin sodium in autism? Maybe it is in fact the calcium that helps with autism and not the Leucovorin part?