I'm backwards researching this after putting some in my smoothie this morning. I bought them just for the fiber, protein and omega 3s. But I feel super energized, beginning even before I drank my coffee.
So I searched online and found a number of sites claiming it gives an all day energy boost. Now I'm usually skeptical of claims as subsequent self experimentation suffers from confirmation bias. But I thought I'd at least share that I found I had an energy boost before even knowing this was a claimed benefit.
I have subsequently ordered some flax seeds (ground) and hemp hearts (whole). I have used flax in smoothies before. I know these need to be ground to digest. I bought ground chia after assuming the same but from searches it seems it is not necessary.