Why No One Is Buying Oat Milk Anymore—Here’s What’s Going On

Oat milk may still be the most popular plant-based milk in the UK, but interest is cooling. Here’s a breakdown of what’s behind the slowdown—and how the market is shifting.

Oat Milk Still Leads—but Its Growth Is Slowing

Oat milk remains the UK’s top dairy alternative. While widely used, recent reporting in The Guardian indicates the category’s growth is softening compared to its early boom.

Why Demand Is Cooling Off

• Nutritional concerns for unfortified options: Gov.UK states that unfortified plant milks—including oat—aren’t nutritionally equivalent to cow’s milk, particularly for young children, unless fortified with key vitamins and minerals.
• Cost difference persists: The Food Foundation notes that plant-based milks still retail for roughly 50% more per litre than standard cow’s milk—a price gap that matters for many shoppers.
• Lactose-free dairy is catching up: Sales of lactose-free milk are rising. Brands like Arla’s Lactofree account for over 70% of the UK’s lactose-free market, offering a familiar taste with dairy’s nutrient profile.

Brands Are Pivoting to Stay Relevant

Some companies are adapting. Alpro, for instance, has invested in producing oat drinks using British-grown oats at its Kettering site—highlighting both sustainability and local sourcing.

Yet not all players are thriving. Lite milk maker Mighty Drinks entered administration this year—a reminder that even established oat-based brands can struggle amid tightening demand.

The Bottom Line

Oat milk isn’t disappearing from UK fridges—but it’s no longer riding a wave. Shoppers are more discerning, leaning toward fortified, budget-friendly dairy alternatives. Brands that prioritise nutrient transparency, affordability, and UK-based production may still keep oat milk relevant in the long run.