Folic Acid

I've been prescribed a well-known chemotherapy to manage an auto-immune disorder.  I'm taking folic acid, since this particular chemo is a folic inhibitor.  My question is what natural and alternative approaches can I consider?  I've done colloidal silver and I do not have the financial resources, at this time, to spend on it, although I didn't see any improvement after a year of taking it. 

And, before anyone gets all up-in-arms about my remark re colloidal silver, keep it in mind that not every approach is going to work for every human being in the same manner.  It just didn't work that well for me with regard to my auto-immune issues.