The best replacement for flaxseed oil is fish oil.

The best alternatives to flaxseed oil are rated as following:
★★★★★  fish oil
★★★★  ground flaxseed
★★★  flaxseed
★★  olive oil
★★  cod liver oil
★★  omega 3
★  capsules
★  coconut oil
★  evening primrose oil
★  fish oil omega 3
★  hemp seed oil
★  krill oil
  flax oil
  flax seed
  flaxseed meal
  walnut oil
  linseed oil
  fish oils
  black seed oil
  omega 3 fish oil
  flaxseed capsules
  hemp oil

Your alternative for flaxseed oil is not listed? Suggest!
Speaking about flaxseed oil, one probably shouldn't forget about omega 3.

Other search terms related to flaxseed oil and their ratings are:

★★★★★ omega 3
omega three
omega 3's
You have in mind a companion for flaxseed oil and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of flaxseed oil in all years. Click on graph for more.
flaxseed oil
fish oil
ground flaxseed