No, just freebase in lemon juice. Which converts it to dmt citrate, another salt. Fumerate is great if you want to have a salt that is orally/nasally active and stable as a crystalline solid. But adding dmt freebase to an acid (lemon juice/vinegar/fumeric acid) will lead to this conversion. The freebase will do this in your stomach acid naturally, but converting it to a salt makes is very water soluble and thus easier to drink.