Buttermilk is good for far more than biscuits. This tangy, fermented dairy drink delivers 8 grams of protein and 22% of your daily calcium in a single cup, all while carrying only 3 grams of fat. But its real advantages go beyond basic nutrition: buttermilk contains unique compounds that can lower cholesterol, reduce blood pressure, and support digestion in ways that regular milk doesn’t.
A Nutrient-Dense, Low-Fat Dairy Option
One cup (245 ml) of cultured buttermilk provides 8 grams of protein, 22% of your daily calcium needs, and 29% of your daily riboflavin, a B vitamin your body uses to convert food into energy and maintain healthy skin and eyes. At just 3 grams of fat per cup, it’s significantly leaner than whole milk while delivering a comparable protein and mineral punch.
Buttermilk also contains a high concentration of milk fat globule membrane (MFGM) components, a mix of beneficial fats and proteins. The concentration of these compounds in buttermilk is roughly five times higher than in regular milk. MFGM is what makes buttermilk nutritionally distinct from other dairy products and drives several of its health benefits.
Cholesterol and Heart Health
Those MFGM compounds include sphingolipids, a type of fat that interferes with cholesterol absorption in your intestines. In a clinical trial published in Nutrition, Metabolism and Cardiovascular Diseases, participants who drank buttermilk daily saw their total serum cholesterol drop by 3.1% and their triglycerides fall by 10.7%. LDL cholesterol (the kind linked to artery buildup) also decreased by 3.1%. The mechanism is straightforward: sphingolipids block some dietary cholesterol from passing through the intestinal wall into your bloodstream, so more of it gets excreted instead.
These aren’t dramatic, medication-level reductions. But for someone looking to nudge their lipid numbers in the right direction through diet, buttermilk offers a meaningful, food-based contribution.
Blood Pressure Benefits
A randomized, double-blind, placebo-controlled trial found that drinking 45 grams of buttermilk daily for four weeks reduced systolic blood pressure by 2.6 mmHg and mean arterial blood pressure by 1.7 mmHg. Both reductions were statistically significant. For context, a 2 mmHg drop in systolic pressure across a population is associated with meaningful decreases in stroke and heart disease risk over time. The combination of cholesterol-lowering and blood pressure effects makes buttermilk a surprisingly useful food for cardiovascular health.
Digestive Support and Probiotics
Cultured buttermilk is made by fermenting milk with specific bacteria, which gives it its characteristic tang and introduces live cultures into the drink. These bacteria can function as probiotics, supporting the balance of microorganisms in your gut. Traditional buttermilk, the liquid left over from churning cream into butter, doesn’t carry the same probiotic benefit because it hasn’t been fermented.
The fermentation process also partially breaks down lactose, the sugar in milk that causes digestive trouble for lactose-intolerant people. While buttermilk isn’t lactose-free, many people who struggle with regular milk find they tolerate buttermilk more comfortably. The lower fat content helps too, since high-fat dairy can slow digestion and worsen bloating in sensitive individuals.
Lactic Acid and Skin
Buttermilk contains a naturally higher concentration of lactic acid than most other dairy products. Lactic acid is a mild chemical exfoliant that dissolves the bonds holding dead skin cells to the surface, promoting cell turnover without the abrasiveness of physical scrubs. This is why buttermilk has shown up in skincare for centuries, long before anyone understood the chemistry behind it.
Applied topically (in baths, masks, or formulated products), buttermilk’s lactic acid can help soften rough patches, reduce dullness, and smooth uneven texture. It’s gentle enough for sensitive skin. The natural fats and proteins in buttermilk also provide moisture, which prevents the dryness that stronger exfoliants sometimes cause. You won’t get the same intensity as a dedicated lactic acid serum, but as a mild, whole-food approach to skin maintenance, it works.
Traditional vs. Cultured Buttermilk
Most buttermilk sold in grocery stores is cultured buttermilk: regular low-fat milk that’s been fermented with bacteria until it thickens and sours. This is different from traditional buttermilk, which is simply the thin, watery liquid left behind after cream is churned into butter. Traditional buttermilk is considered a waste product of the dairy industry and is rarely sold to consumers in most Western countries.
The nutritional profiles overlap significantly, since both contain MFGM compounds, calcium, and protein. The key difference is that cultured buttermilk carries live bacterial cultures with probiotic potential, while traditional buttermilk does not. If gut health is part of your reason for drinking it, cultured is the version you want. Check the label for “live active cultures” to confirm the bacteria haven’t been killed off during processing.
Why Buttermilk Works So Well in Baking
If you’ve ever wondered why so many recipes call for buttermilk specifically, the answer is chemistry. The lactic acid in buttermilk reacts with baking soda (sodium bicarbonate) to produce carbon dioxide gas. Those CO2 bubbles expand in the heat of the oven, creating the light, fluffy texture in biscuits, pancakes, and quick breads. Without an acidic liquid like buttermilk, baking soda can’t do its job, and your baked goods come out dense and flat.
Buttermilk also tenderizes. Its acidity weakens gluten strands in flour, which prevents baked goods from becoming tough and chewy. This is why buttermilk pancakes have that distinctive soft, almost creamy interior. The tangy flavor adds depth too, balancing sweetness in cakes and creating a more complex taste in savory applications like fried chicken marinades and ranch dressings. Soaking meat in buttermilk before cooking serves a similar tenderizing function, with the mild acid gently breaking down protein fibers on the surface.
How to Use More Buttermilk
Beyond baking and marinades, buttermilk works as a base for salad dressings, cold soups, and smoothies. Its tangy flavor pairs well with fresh herbs, garlic, and citrus. You can drink it straight, which is common in South Asian and Middle Eastern cuisines, where it’s often seasoned with salt, cumin, or mint and served as a cooling side with spicy meals.
If you don’t have buttermilk on hand, adding a tablespoon of lemon juice or white vinegar to a cup of regular milk and letting it sit for 10 minutes creates a passable substitute for baking. It will curdle slightly and develop some acidity. But this substitute lacks the probiotic cultures, the MFGM compounds, and the full flavor of real cultured buttermilk, so it’s a workaround for recipes rather than a nutritional replacement.