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It is a fair question with a reassuring answer. Milk can bind to some of the antioxidant compounds in tea, but the research is mixed and the real-world difference is minor. Your splash of milk is not cancelling out your cup.
What actually happens
Tea's antioxidant polyphenols can attach to the proteins (caseins) in milk. Some studies suggest this reduces how many are available to the body; others find little meaningful change. The honest position is that the effect is real but small and not settled. See Wikipedia: green tea and Wikipedia: tea.
The practical takeaway
If antioxidants are your main reason for drinking tea, green and white teas are usually drunk without milk anyway. For everyday black tea, the modest effect of milk is not worth worrying about, the benefits of tea are modest to begin with, and enjoyment matters more than chasing a marginal number.
FAQ
Does milk ruin tea's health benefits? No; it may slightly reduce antioxidant availability, but the effect is small and uncertain.
Should I drink tea black for the antioxidants? Only if you prefer it; green and white teas are naturally milk-free.
Does it matter for hydration? No, milky tea still hydrates.
This is general information, not medical advice.
Sources
Related
Shop the green tea range or the full tea shop (free UK postage over £35).
More from the tea wiki
- Green tea
- Black tea
- Oolong tea
- White tea
- Herbal tea
- Caffeine in tea
- How to make tea properly
- Loose leaf vs teabag
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