Is Optimum Nutrition Gold Standard 100% Casein Chocolate Peanut Butter Vegan?

No. This product is not vegan as it lists 1 ingredient that derives from animals and 2 ingredients that could could derive from animals depending on the source.

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Why it's not vegan

micellar casein
lecithin
xanthan gum

micellar casein

Dietitian note

Casein is a protein found in milk products.

Note by Rhyan Geiger, RDN

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Ingredients

Micellar Casein , Cocoa Processed with Alkali , Flavors Natural & Artificial , Salt , Gum Blend ( Cellulose Gum , Xanthan Gum , Carrageenan ) , Lecithin , Acesulfame Potassium , Sucralose , Aminogen

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What is a Vegan diet?

A vegan diet excludes all animal-derived foods, including meat, poultry, fish, dairy, eggs, and honey. It focuses on plant-based sources such as fruits, vegetables, grains, legumes, nuts, and seeds. Many people choose veganism for ethical, environmental, or health reasons. When well-planned, it provides sufficient protein, fiber, and antioxidants, though supplementation or fortified foods may be needed for nutrients like vitamin B12, iron, and omega-3 fatty acids. Vegan diets are associated with lower risks of heart disease and improved digestion but require mindfulness to ensure balanced and complete nutrition.