The Claim

Milk lacking A1 beta-casein (A2 milk) is associated with higher glutathione levels and lower inflammation in animal models.

Source: Effect of A1 vs A2 beta‐casein containing diet on glutathione antioxidant status: Implications for inflammation and cognitive function via gut‐brain axis

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
40score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

A2 milk, which lacks A1 beta-casein, is linked to increased glutathione levels and reduced inflammation in animal studies.

See the scientific wording

Milk lacking A1 beta-casein (A2 milk) is associated with higher glutathione levels and lower inflammation in animal models, suggesting it may be a preferable dietary option for individuals sensitive to oxidative stress.

Why this might work

When A1 beta-casein is digested, it releases a peptide that blocks the absorption of a building block needed to make a key antioxidant. Without enough of this antioxidant, cells experience more damage and trigger inflammation.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Effect of A1 vs A2 beta‐casein containing diet on glutathione antioxidant status: Implications for inflammation and cognitive function via gut‐brain axis

    In animals, milk with A1 protein made them have less of a key antioxidant and more gut inflammation, while milk with only A2 protein kept their antioxidant levels higher and inflammation lower. This suggests A2 milk might be better for people whose bodies are sensitive to stress.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.