Flaxseed is everywhere. It’s in smoothies, oatmeal, protein bars, crackers, keto bread and many healthy recipes you can find online. You’ve probably heard that it’s a great source of omega-3s, that you should grind it fresh, and that you should eat it for its lignans.
I’ve heard all of it.
I don’t recommend flaxseed.
In June 2026, Germany’s Federal Institute for Risk Assessment (BfR) published a new warning about the risks of flaxseed. The agency recommends that adults limit raw flaxseed to 15 to 20 grams per day and says young children should avoid raw flaxseed altogether.
That’s a strange amount of caution for a food the wellness industry tells you to add to your smoothie every morning.
Flax Has a Defense System
Flaxseed naturally contains cyanogenic glycosides, compounds that can release hydrogen cyanide, a highly toxic gas. When you crush, chew or grind the seed, you break open its cells and bring those compounds and enzymes together, which then releases hydrogen cyanide.
One note is that heat inactivates the enzymes involved in cyanide release, and hydrogen cyanide evaporates readily. So cooking can greatly reduce the cyanide issue. But most people aren’t grinding flax and cooking it. They’re grinding it and putting it straight into a cold smoothie. Plus, later on I’ll tell you why heating it up is a terrible idea too.
In the full article, you’ll get:
The other toxin hiding inside flaxseed
Why flax’s famous “omega-3” isn’t the same as the omega-3 in fish
What I think about flax lignans and flax oil
A super smoothie recipe with no flax
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