Quick answer
Both are Level 3, but through different routes. Fairlife uses ultra-filtration (a mechanical process) plus lactase enzyme on real milk, 3-4 ingredients. Oatly uses enzymatic processing, added oils, phosphates, and calcium fortification to build a milk substitute from oats; 8-10 ingredients. Fairlife has a shorter ingredient list; Oatly has no dairy. The choice depends on dietary needs, not processing level.
Processing levels can vary significantly between brands and specific products within each category. Always check the ingredient list of the specific product you are considering. Use our product search to look up exact processing scores. These comparisons evaluate processing level and ingredient composition only. They do not account for taste, price, convenience, cultural significance, or individual dietary needs.
How do they compare by the numbers?
Sample products from each
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Frequently asked questions
Is Fairlife or Oatly more processed?
They are comparably processed (both Level 3) but through different methods. Fairlife has fewer ingredients (3-4) because it starts with whole milk and filters it. Oatly has more ingredients (8-10) because it must construct milk-like properties from oats using enzymes, oils, and stabilizers. Neither is ultra-processed.
Which has more protein?
Fairlife, significantly. Ultra-filtration concentrates milk protein to 13g per serving. Oatly has about 3g per serving. If protein intake is a priority, Fairlife is the higher-protein option. Oatly's advantage is being dairy-free and plant-based, not protein content.