Is Optimum Nutrition Gold Standard 100% Isolate Strawberry Flavor Vegan?

No. This product is not vegan as it lists 4 ingredients that derive from animals and 1 ingredient that could could derive from animals depending on the source.

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Why it's not vegan

hydrolysed whey protein isolate
milk
whey protein isolate
whey isolate proteins
xanthan gum

hydrolysed whey protein isolate

Dietitian note

Whey is a protein found in milk.

Note by Rhyan Geiger, RDN

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Ingredients

Whey Isolate Proteins [milk] (95%) (whey Protein Isolate, Hydrolysed Whey Protein Isolate, Emulsifier: Soy Lecithin), Flavourings [milk], Acids (citric Acid. Malic Acid), Thickener (xanthan Gum, Sweetener (sucralose), Colour (beetroot Red). Contains Milk, Soy. May Contain: Gluten, Egg.

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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.