This recipe is from Carrie Brown’s Eat Smarter! Smoothies and Sides.  While not particularly low carb due to the orange, it packs a solid amount of nutrients.

ingredients

• 1 cup / 8 fl oz. unsweetened coconut
• milk ⅔ cup / 2 oz. / 55g powdered egg white
• 1 oz. / 30 g unsweetened cocoa powder
• 2 oranges, take zest from one orange before peeling
• ½ tsp. sea salt
• ½ tsp. orange essence
• 1 head Romaine lettuce
• Xylitol as needed to sweeten
• ½ tsp. guar gum

directions

1. Place ingredients in the blender in the order listed, except guar gum.
2. Blend on high until completely smooth.
3. Tap the guar gum through the hole in the blender lid while the blender is still running and blend for 5 seconds.

The micronutrient breakdown is shown below indicating that it does quite well in terms of vitamins, minerals and protein.

The table below shows the nutritional data per 500 calorie serving.