v0.8 only states its fibre source is from oats powder which from what I can find shows you need about 400g to get near the RDI of fibre. I use 45g in my mix.
How else are people getting a cheap version of soluble and insoluble fibre in your diet? I’ve been using Fitness fibre but to buy here in AUS and from the number of servings (26g per serve) I get from 1 container it makes it fairly expensive.
I tried adding psyllium husk but if left in the mixture for long periods it swells and turns in to a jello mess.