Cream of tartar (potassium bitartrate) is an acidic powder that forms as a byproduct of winemaking. It contains no digestible carbohydrates and is commonly used in low-carb and keto baking to stabilize egg whites, activate baking soda, and prevent sugar crystallization.

Quick Carb Snapshot

  • Carbs (per 100 g): 0 g net
  • Carbs (standard portion): 0 g per ¼ tsp
  • Glycemic Index: 0
  • Similar Low-Carb Options: Lemon juice, white vinegar
  • Blood Sugar Impact: Lower
  • Keto-Friendly? Yes

Key Traits

  • Texture: Fine powder
  • Flavor: Mildly acidic
  • Carb Impact: None
  • GI / GL Notes: No glucose impact
  • Common Uses: Meringues, baking, stabilizing eggs

Best For

  • Low-carb and keto baking
  • Stabilizing whipped egg whites
  • Activating baking soda

Avoid For

  • Excessive use (metallic taste)
  • Potassium-restricted diets
  • Direct substitution without acid balance

Why Choose Cream of Tartar for Low-Carb Eating

Texture & Structure

  • Improves structure without starch
  • Enhances volume in egg foams
  • No thickening from carbs

Flavor & Nutrition

  • Neutral in small amounts
  • No sugars or starches
  • Source of potassium

Storage & Shelf Life

Pantry

Store airtight in a cool, dry place.

Cooked

Prepared foods store normally.

Signs It Has Gone Bad

  • Clumping from moisture
  • Off odor
  • Loss of acidity

Allergy & Dietary Flags

  • Gluten-Free: Yes
  • Nuts: No
  • Nightshade: No
  • Vegan / Vegetarian: Yes

Often paired with baking soda and egg whites, cream of tartar is a
zero-carb acidic stabilizer.

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