Preheat the oven to 350ºF. Line 12 cups of a standard muffin pan with paper liners.
In a large bowl, whisk together the coconut flour, salt, and baking soda. In a separate bowl, whisk together the eggs, butter, honey, and vanilla. Add the wet ingredients to the dry and mix well to combine. Gently stir in the blueberries, lemon juice, and lemon zest.
Divide the batter among the lined muffin cups. Bake for 20-25 minutes until golden brown and cooked through. Cool completely before serving. Store in an airtight container in the refrigerator.