Chamomile tea does appear to lower blood sugar, based on the clinical evidence available so far. A systematic review and meta-analysis published in the Journal of Diabetes and Metabolic Disorders found that chamomile consumption significantly reduced both fasting blood sugar and HbA1c (a marker of long-term blood sugar control) in randomized controlled trials. The effect is modest, and the studies are still relatively small, but the results are consistent enough to take seriously.
What the Clinical Evidence Shows
The strongest evidence comes from a meta-analysis that pooled results from multiple randomized controlled trials. Across these studies, people who consumed chamomile had statistically significant reductions in fasting blood sugar compared to control groups, with high consistency between studies. That consistency matters: it suggests the effect is real rather than a fluke of one particular trial.
The same analysis found a significant reduction in HbA1c, which reflects average blood sugar levels over the previous two to three months. This is arguably the more important finding, because a single fasting blood sugar reading can fluctuate day to day. A drop in HbA1c means chamomile was associated with better blood sugar control sustained over weeks, not just a temporary dip after drinking a cup of tea. The HbA1c analysis included 83 participants across two studies, so while the results were strong, the sample size is still small by medical research standards.
How Chamomile May Affect Blood Sugar
Chamomile contains several plant compounds that interact with glucose metabolism. The most studied is apigenin, a flavonoid found in high concentrations in chamomile flowers. In laboratory and animal research, apigenin has been shown to improve how cells respond to insulin, the hormone responsible for moving sugar out of the bloodstream and into cells. When cells respond more efficiently to insulin, blood sugar levels drop.
Chamomile compounds also appear to slow the activity of enzymes in the gut that break down starches into sugar. When those enzymes work more slowly, sugar enters the bloodstream more gradually after a meal rather than in a sharp spike. This is a similar mechanism to how some prescription diabetes medications work, though chamomile’s effect is much milder. The antioxidant activity of chamomile may also play a role, since oxidative stress (a kind of cellular damage from unstable molecules) tends to worsen insulin resistance over time.
What This Means in Practical Terms
The reductions seen in the clinical trials are meaningful but not dramatic. Chamomile tea is not going to replace diabetes medication, and nobody should treat it as a substitute for the lifestyle changes or drugs their doctor has recommended. What the data suggests is that regular chamomile consumption could be a useful addition to an existing blood sugar management plan, particularly for people with type 2 diabetes or prediabetes who are already working on diet and exercise.
Most of the clinical studies used chamomile in tea or extract form, consumed daily over periods of several weeks. A single cup before bed is unlikely to produce a noticeable change in your next morning’s fasting glucose. The benefit appears to accumulate with consistent, daily use over time, which is reflected in the HbA1c improvements rather than just short-term fasting sugar readings.
Safety and Drug Interactions
Chamomile tea is generally safe for most people, and it has been consumed for centuries without significant safety concerns. However, because it does lower blood sugar, there is a theoretical risk of an additive effect if you’re already taking medications that do the same thing. If you’re on insulin or oral diabetes drugs, adding daily chamomile could potentially push your blood sugar lower than expected. This is especially worth paying attention to if you already experience episodes of low blood sugar (hypoglycemia).
Chamomile also belongs to the same plant family as ragweed, so people with ragweed allergies occasionally react to it. And because chamomile contains compounds that can mildly thin the blood, people taking blood-thinning medications should be cautious about consuming it in large amounts or as a concentrated supplement. A regular cup or two of tea is a different situation than high-dose chamomile extract capsules, both in terms of benefits and risks.
How Much and How Often
There’s no standardized dose for chamomile tea as a blood sugar intervention. The clinical trials varied in what they used, from brewed tea to capsules of chamomile extract. Most tea-based studies involved one to three cups per day, consumed consistently for at least eight weeks. If you’re drinking bagged chamomile tea from the grocery store, steeping it for five to ten minutes in freshly boiled water will extract more of the active compounds than a quick dip.
Timing may also matter. Some research suggests that drinking chamomile tea with or shortly after meals could help blunt post-meal blood sugar spikes, given its effect on starch-digesting enzymes. Drinking it before bed, which is the most common habit, may still contribute to overall glycemic improvement over time but is less targeted at those post-meal surges. Experimenting with both approaches, especially if you monitor your own blood sugar, could help you see whether it makes a noticeable difference for you personally.