The best replacement for psyllium is methylcellulose.

The best alternatives to psyllium are rated as following:
★★★★★  methylcellulose
★★★★★  inulin
★★★★★  flax
★★★  wheat dextrin
★★★  metamucil
★★★  benefiber
★★★  flax seed
★★  glucomannan
★★  miralax
★★  oat bran
★★  chia
★★  pgx
★★  bran
★  wheat bran
★  dextrin
★  inulin fiber
★  ispaghula
★  xanthan gum
★  polycarbophil
★  chia seeds
★  senna
★  methyl cellulose
  flaxseed
  guar
  acacia fiber
  acacia
  citrucel
  bentonite
  calcium polycarbophil
  cellulose
  flax fiber
  fiber
  polyethylene glycol
  guar gum
  rice bran

Your alternative for psyllium is not listed? Suggest!
Speaking about psyllium, one probably shouldn't forget about senna.

Other search terms related to psyllium and their ratings are:
★★★★★ senna
★★★ bentonite
★★★ acidophilus
You have in mind a companion for psyllium and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of psyllium in all years. Click on graph for more.
psyllium
methylcellulose
inulin