Barley tea is a grain-based drink with modest effects on digestion and blood sugar, but not a cure for any condition

Barley tea is made by steeping roasted barley grains in hot water, producing a mild, slightly sweet beverage with no caffeine. It contains compounds called beta-glucans—a type of soluble fiber—along with small amounts of B vitamins, magnesium, and antioxidants like ferulic acid. The research on barley tea shows real but limited effects: it may help slow digestion slightly, reduce blood sugar spikes after meals, and support cholesterol levels. These changes are measurable in controlled studies but modest in size.

Barley tea is not a treatment for diabetes, heart disease, or any other condition, and it should not replace medical care or medication. If you take blood sugar or cholesterol medication, barley tea is a beverage you can enjoy alongside your treatment, not instead of it.

Key Takeaways

  • Barley tea contains beta-glucans, a soluble fiber that slows digestion and may reduce how quickly blood sugar rises after eating.
  • Human studies show small improvements in cholesterol and blood sugar control, but the effects are not large enough to treat disease on their own.
  • Barley tea has no caffeine and is generally safe for most people, though those with celiac disease should avoid it because barley contains gluten.
  • The strongest evidence comes from studies of barley grain itself rather than tea, so the drink may have weaker effects than whole barley.

How beta-glucans in barley affect digestion and blood sugar

Beta-glucans are long-chain carbohydrates that dissolve in water and form a gel-like substance in your digestive tract. This gel slows the movement of food through your stomach and small intestine, which means glucose enters your bloodstream more gradually. A slower rise in blood sugar produces a smaller spike, and your pancreas does not have to release as much insulin to bring it back down.

In human trials, people who consumed barley or barley products showed blood sugar rises that were 20 to 30 percent lower than when they ate the same meal without barley. A 2016 review in the journal Nutrition Reviews found that barley beta-glucans reduced post-meal blood sugar in most studies, though the effect size varied. The effect is real but modest—it is not the same as taking a diabetes medication, and it works best when barley is part of a meal with other foods rather than consumed alone.

What the research shows about cholesterol and heart health

Several human studies have found that barley consumption is linked to small reductions in LDL cholesterol (the kind associated with heart disease risk) and total cholesterol. A meta-analysis published in Nutrition Reviews in 2016 pooled data from multiple trials and found that barley beta-glucans lowered LDL cholesterol by an average of 5 to 8 percent. This is a measurable change, but it is smaller than the effect of prescription statins or major dietary shifts like reducing saturated fat intake.

Most of these studies used whole barley grain or barley flour rather than barley tea. Tea is a more dilute form—you are steeping the grain rather than eating it whole—so the amount of beta-glucans you actually consume in a cup of barley tea is likely lower than in a serving of barley grain. This means the cholesterol effect from tea alone is probably smaller than what the grain studies show.

Antioxidants and other compounds in barley tea

Barley contains phenolic compounds, including ferulic acid and other polyphenols, which act as antioxidants in the body. Antioxidants neutralize free radicals—unstable molecules that can damage cells. In test-tube and animal studies, barley extracts have shown antioxidant activity, but human evidence is limited. Most antioxidant research on barley has been done in cells or in animals, not in people drinking barley tea.

Barley also contains small amounts of B vitamins (thiamine, niacin, and pantothenic acid) and minerals like magnesium and manganese. These are present in the grain, but the amount that leaches into tea water is small. If you are looking to barley tea as a source of these nutrients, whole grains or fortified foods are more reliable sources.

Who should avoid barley tea

Barley contains gluten, a protein that triggers an immune response in people with celiac disease and causes symptoms in those with non-celiac gluten sensitivity. If you have either condition, barley tea is not safe for you. People with a wheat allergy may also react to barley, though the proteins are different and cross-reactivity is not universal—check with your doctor if you have a wheat allergy and want to try barley.

Barley tea is generally safe for pregnant and nursing people, though there is limited research on heavy consumption during pregnancy. If you take blood-thinning medications like warfarin, very high intakes of barley might theoretically interfere, but normal tea consumption is unlikely to cause a problem. If you are on medication for blood sugar or cholesterol, barley tea is not a substitute, and you should not change your diet without talking to your doctor first.

How barley tea compares to whole barley grain

The strongest evidence for barley's health effects comes from studies of whole barley grain or barley flour, where people consume the entire grain. In tea, you are steeping the grain in hot water, so only the water-soluble compounds—mainly beta-glucans and some antioxidants—transfer into the liquid. The insoluble fiber and many of the minerals stay behind in the grain.

This means barley tea has a weaker effect than eating barley grain itself. If you want the full benefit of barley's fiber and nutrients, eating barley as a grain (in soups, salads, or as a side dish) or using barley flour in baking will give you more of the active compounds. Barley tea is a pleasant, caffeine-free beverage, but it should not be your only way of consuming barley if you are looking for health effects.

What remains unclear about barley tea

Most research on barley has focused on the grain itself, not the tea. The amount of beta-glucans that actually dissolves into barley tea water depends on how long you steep it, the water temperature, and the type of barley used. No standard has been set for how to prepare barley tea, so the strength of different commercial products likely varies. This makes it hard to know exactly how much of the active compound you are getting in each cup.

Long-term studies of barley tea in humans are scarce. Most trials last weeks to a few months, so we do not know whether the blood sugar or cholesterol effects persist if you drink barley tea regularly for years. It is also unclear whether barley tea has any effect on weight, inflammation, or other health markers beyond blood sugar and cholesterol.

Frequently Asked Questions

Does barley tea have caffeine?

No. Barley is a grain, not a caffeinated plant, so barley tea contains no caffeine. This makes it a good choice if you want a warm beverage in the evening or if you are sensitive to caffeine.

Can barley tea replace diabetes medication?

No. Barley tea may slow blood sugar rises slightly, but the effect is small and not enough to treat diabetes. If you have diabetes or prediabetes, continue taking your medication as prescribed and talk to your doctor before making any dietary changes.

How much barley tea do I need to drink to see health benefits?

The studies that found effects on blood sugar and cholesterol used barley grain or flour, not tea. There is no established dose for barley tea itself. Drinking it regularly as part of a balanced diet is unlikely to cause harm, but do not expect large health changes from tea alone.

Is barley tea safe during pregnancy?

Barley tea is likely safe in normal amounts during pregnancy, but research is limited. If you are pregnant or nursing and want to drink barley tea regularly, ask your doctor first to be sure it fits your individual situation.

What is the difference between barley tea and other grain-based teas?

Barley tea is made from roasted barley grains. Other grain teas like corn tea or brown rice tea are made from different grains and have different nutrient profiles. Barley is notable for its beta-glucan content, which the others have in lower amounts or not at all.