Don't worry about the different levels of folate in the 2 medications. 500 is the minimal recommended dose for pre conception, and pregnant women "without" a history of spina bifida.

I take elevit and an additional 5mg (5800mg in total) of folic acid every day due to Max having spina bifida, this was recommended by my Ob, GP, Pharmacist and genetic counsellor.

I have no idea why they recommend Elevit over the other types, but after Max having SB, I am quite happy to pay the additional money for a supplement that is so highly recommended. For the record I was taking blackmores pregnancy formula throughout Shelby's pregnancy (she has a sacral dimple, not sure if related) and never stopped it until after Max was born and I swapped it for elevit.

It may be coincidental but I am not willing to take a chance.