Use your coffee grinder if
It is clean, dry, and you do not mind switching between coffee and flaxseed.
Direct coffee-grinder answer
Yes. A clean, dry coffee grinder can grind dry whole flaxseed. The question is whether you want your coffee gear doing seed duty every morning.
Plain choice
It is clean, dry, and you do not mind switching between coffee and flaxseed.
You dislike shared smells, seed residue, or cleaning coffee gear before breakfast.
Your existing coffee grinder already makes the flax routine easy enough to repeat.
If you use coffee gear
This is not a medical routine or a big prep system. It is a small kitchen step: dry whole seed, quick grind, use it now.
Current FreshFlax answer
The Multi-Grain Flax Grinder is the practical current checkout option for dry whole flaxseed and small dry batches. Every order is reviewed before shipment release.