Yes. – Whey Protein Powder (isolate form) is allowed, in restricted amounts, on the slow carb diet.
You may have up to 50 grams of Whey Protein Powder within 30 minutes of resistance training one time each day.
*Note: Some recent studies indicate that Whey Protein, may limit weight loss, and have recommend other Protein Powders as alternatives.
Recommended alternatives: Casein Protein Powder, Hemp Protein Powder, Brown Rice Protein Powder, and Pea Protein Powder.
Vegan recommended protein sources are:Pure Advantage Pea Protein Isolate, Sun Warrior Brown Rice Protein and
Nitro Fusion Plant Fusion (Rice, Pea, and Artichoke Protein)
The above protein powders can be mixed with Almond Milk, and 1-2 Tablespoons of Almond Butter.