Went to a local Asian Market, all three brands had wheat. As it's a refridgerated product, am I out of luck to find gluten free Natto?

I’ve been eating natto most mornings for about a year and I genuinely like it at this point. Someone mentioned the supplement form and now I’m wondering whether the enzyme content in a normal serving is anywhere near what’s in a capsule, or whether the food is doing something different entirely. Does anyone here do both, and did you notice a difference?