Ginger shows some promise for lowering blood sugar, but the evidence is mixed and far from conclusive. Small clinical trials have found modest reductions in fasting blood sugar among people with type 2 diabetes who took ginger supplements daily, yet when researchers pool results across multiple studies, the overall effect loses statistical significance. A cup of ginger tea contains far less ginger than the doses used in these trials, making any blood sugar benefit from tea alone unlikely to be dramatic.
What the Clinical Trials Actually Show
The most-cited research on ginger and blood sugar comes from small trials involving people with type 2 diabetes who took concentrated ginger powder in capsule form. In one Iranian study of 22 participants, those who received ginger supplements saw their fasting blood sugar drop by about 19 mg/dL on average and their HbA1c (a marker of blood sugar control over the previous two to three months) drop by roughly 0.77 percentage points. Those are meaningful numbers on paper, especially the HbA1c change.
But a 2024 systematic review and meta-analysis that pooled five studies together told a more cautious story. Across trials using 1.2 to 2 grams of ginger powder per day over 4 to 12 weeks, the combined results showed no statistically significant effect on either fasting blood sugar or HbA1c. Some individual studies found real reductions; others didn’t. That inconsistency is a red flag that the effect, if it exists, is small and unreliable.
Ginger Tea vs. Ginger Supplements
This distinction matters. The clinical trials used measured doses of dried ginger powder packed into capsules, typically between 1.2 and 2 grams per day. A typical cup of ginger tea, whether made from a commercial tea bag or a few slices of fresh ginger steeped in hot water, delivers considerably less of ginger’s active compounds. Steeping extracts only a fraction of what’s in the root, so the concentration reaching your bloodstream is lower than what trial participants received.
That doesn’t mean ginger tea has zero effect. It simply means the already-uncertain results from supplement trials can’t be directly applied to tea. If concentrated ginger powder at clinical doses produces inconsistent results, a milder tea is even less likely to move the needle in a measurable way.
How Ginger May Affect Blood Sugar
Researchers believe ginger’s bioactive compounds may improve blood sugar through a few pathways. They appear to help cells take up glucose more efficiently, support insulin sensitivity, and reduce oxidative stress, which is elevated in people with diabetes and can worsen insulin resistance over time. The Iranian trial also found improvements in markers related to cholesterol and oxidative damage, suggesting ginger’s benefits may extend beyond glucose alone. These mechanisms are plausible, but “plausible” is not the same as “proven to work at tea-strength doses in everyday life.”
What Diabetes Guidelines Say
The American Diabetes Association’s 2025 Standards of Care are direct on this point: they do not recommend ginger, or any herbal supplement, for glycemic management. The guidelines specifically list ginger alongside cinnamon, turmeric, and aloe vera as supplements lacking sufficient evidence to support routine use in people with type 1 or type 2 diabetes.
Interestingly, the same guidelines do encourage using ginger as a seasoning in food, recommending herbs and spices as a flavorful alternative to salt. So the ADA sees ginger as a fine ingredient in your diet. They just don’t consider it a treatment for blood sugar control.
Safety and Side Effects
Ginger tea is generally safe for most people. A comprehensive review of 109 randomized controlled trials found that heartburn was the most consistently reported side effect, appearing in studies where participants consumed between 500 and 2,000 milligrams of ginger daily. At typical tea quantities, this is unlikely to be an issue for most people, though those prone to acid reflux may notice it.
One concern worth knowing about: ginger can affect platelet function. Research has shown that high doses (around 10 grams of powdered ginger in a single dose) significantly reduced blood clotting activity. You’re unlikely to reach that level from tea, but if you take blood-thinning medications or are preparing for surgery, it’s worth mentioning your ginger intake to your healthcare provider. Similarly, if you take diabetes medications that already lower blood sugar, adding any supplement with glucose-lowering potential could theoretically increase the risk of blood sugar dropping too low, even if the individual effect of ginger is small.
Practical Takeaways
If you enjoy ginger tea, there’s no reason to stop. It’s a low-calorie, flavorful drink, and swapping it for sugary beverages is a net positive for blood sugar regardless of ginger’s direct effects. Fresh ginger steeped in hot water for 5 to 10 minutes will give you more of the active compounds than a commercial tea bag.
What ginger tea shouldn’t be is your strategy for managing blood sugar. The evidence is too inconsistent, the doses in tea are too low, and major diabetes organizations explicitly advise against relying on it. For people with prediabetes or type 2 diabetes, the interventions with strong evidence behind them remain dietary changes, physical activity, weight management, and when needed, medication. Ginger tea can be a pleasant part of your routine. It just isn’t a medical intervention.