In blender, combine blueberries, yogurt, orange juice, grapefruit concentrate, oat bran, honey, chia seeds (if using) and flaxseed.
Mix on medium speed until combined.
Add ice cubes; pulse until ice cubes begin to break down.
Puree until completely incorporated.
Notes
PER SERVING (APPROX 1 ½ CUPS): about 262 cal, 15 g pro, 2 g total fat (trace sat. fat), 50 g carb (4 g dietary fibre, 33 g sugar), 10 mg chol, 72 mg sodium, 227 mg potassium. % RDI: 35% calcium, 4% iron, 82% vit C, 15% folate.
Recipe by This Lil Piglet at https://thislilpiglet.net/2013/02/rise-and-shine-citrus-smoothie/