casein protein
Dairy & Alternatives
Is casein protein high in sulfites?
Is casein protein high or low in sulfites? See its exact rating, how much counts as a portion, and its FODMAP, salicylate, oxalate and diet compatibility in one place.
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Sensitivity notes
Why sulfites food checker matters
Sulfites are preservatives found in wine, dried fruits, and processed foods. They can trigger asthma symptoms, headaches, and allergic reactions in sensitive individuals.
- Dried fruits are often high in sulfites unless labeled 'unsulfured'
- Wine, especially white, commonly contains sulfites
- Fresh foods are naturally sulfite-free
- Check medication labels - some contain sulfites
- Look for 'contains sulfites' on labels (required above 10ppm)
Sensitivities
What casein protein contains
FODMAPs
Histamine & Amines
Plant compounds
Irritants
Additives
Allergens
Diet fit
Where casein protein fits
Therapeutic diets
Lifestyle diets
Religious diets
What to know about casein protein
Casein protein is the slow-digesting fraction of milk, sold as a night-time protein powder because it gels in the stomach and releases amino acids over hours. It is graded high on dairy protein, and that is the point most labels obscure: casein is one of the two proteins (with whey) responsible for cow's milk protein allergy, so a tub marked lactose free or low lactose is still made of the exact molecule a milk allergy reacts to. Residual lactose is graded moderate, low enough that many lactose intolerant people tolerate it and high enough that some do not. On everything else it is clean: no gluten, no FODMAPs, no histamine, no oxalate, no nickel, no caffeine.
Watch for
- Graded high on dairy protein.Lactose free casein is not milk allergy safe, because the allergy is to the protein and casein is the protein
- Moderate residual lactose.Micellar casein and caseinate powders are filtered, not lactose free, so a large night-time serve can still bloat a lactose intolerant gut
- Casein is the milk protein most likely to survive heat and processing, so cooked-in casein in a bar or ready-to-drink shake stays reactive
- Read the tub, not the front label.Blends marketed as slow-release routinely mix casein with whey, and milk protein concentrate and sodium or calcium caseinate are all casein under another name
- Clean on the food chemistry side: no gluten, FODMAPs, histamine, oxalate, nickel or caffeine, so a reaction to it points squarely at the dairy
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Sulfites Guide
Everything you need to know about sulfites sensitivity and smart food choices.
Sulfites are preservatives found in wine, dried fruits, and processed foods. They can trigger asthma symptoms, headaches, and allergic reactions in sensitive individuals.
Sensitivity varies widely. What triggers one person may be fine for another. Track your reactions to find your personal threshold.
These foods are generally well-tolerated for Sulfites sensitivity:
View all safe options
These foods have moderate levels and may be tolerated in small amounts:
These foods are high in sulfites and may trigger symptoms:
View full list
If you're sensitive to Sulfites, consider these strategies:
- 1Dried fruits are often high in sulfites unless labeled 'unsulfured'
- 2Wine, especially white, commonly contains sulfites
- 3Fresh foods are naturally sulfite-free
- 4Check medication labels - some contain sulfites
- 5Look for 'contains sulfites' on labels (required above 10ppm)
Pro tip: Keep a food diary to track your reactions. The Triggerbites app makes this easy with automatic pattern detection.
Want personalized tracking?
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Get the AppFAQ
Is casein protein high in Sulfites?
Sulfites: low signal for most people.
Can I still eat casein protein if I'm sensitive to Sulfites?
Usually fine in normal portions.
What else should I check?
Check Dairy Proteins, Vegan, and AIP next for a fuller picture.