Drinks That Lower Cortisol: What the Evidence Actually Supports

What you drink can nudge your stress response a little, but it helps to start with the honest version: there is no drink that drains cortisol on demand. The best-studied options are modest, often short-lived, and most of them work by helping you relax or sleep rather than by lowering the hormone directly.

Here is what the research actually shows for the popular picks, plus the drinks worth limiting.

A quick reality check

Cortisol is your main stress hormone, and it is meant to rise and fall across the day (Physiology, Cortisol — StatPearls). A calming drink will not override that rhythm. What the better-studied options can do is take the edge off in the moment, support sleep, or steady your blood sugar. All of those indirectly help your stress response. Think of these as small, pleasant habits, not treatments. For the bigger picture of how food and drink fit together, see the cortisol diet guide.

Green tea and L-theanine

Green tea is the drink with the most going for it, mostly thanks to an amino acid called L-theanine. In one double-blind trial, a drink containing 200 mg of L-theanine reduced the cortisol response to a stressful task a few hours later, compared with a placebo (L-theanine trial). That is promising, but keep it in perspective. It was a single-dose study, and longer trials have found little effect on everyday cortisol levels.

There is also a catch. Green tea contains caffeine, which tends to nudge cortisol up (caffeine and cortisol). For most people the calming L-theanine and the stimulating caffeine settle into "gentle alertness," which is why green tea can feel smoother than strong coffee. If caffeine affects you, a smaller cup earlier in the day is the sensible move.

Chamomile and other herbal teas

Caffeine-free herbal teas make a good evening habit, and chamomile has the most research behind it. In a randomized trial, long-term chamomile was safe and significantly reduced anxiety symptoms in people with generalized anxiety disorder (chamomile trial). Worth noting: that study measured anxiety, not cortisol. So the benefit is best understood as calming, not as a proven drop in stress hormones.

Peppermint and lemon balm are pleasant and caffeine-free too, though their direct evidence is thinner. The real value of an evening cup is often the ritual itself: a warm, screen-free wind-down that helps your body shift toward rest.

Ashwagandha drinks

Ashwagandha turns up in a lot of "cortisol" drinks and powders. It is one of the more studied options, and some research suggests it may help with stress and sleep. But the evidence is still limited, and the picture for anxiety is unclear (NCCIH on ashwagandha). There are also real cautions: rare reports of liver injury have been linked to ashwagandha supplements, and it should be avoided in pregnancy and while breastfeeding. Because it can interact with medications and health conditions, check with a clinician before adding it, rather than assuming a trendy canned drink is automatically safe.

Water and "hydration" drinks

Plain water earns a place here, but for an honest reason. Staying hydrated supports steady energy and mood, and water is an easy swap for the sugary or highly caffeinated drinks that work against you. The popular claim that mild, everyday dehydration meaningfully raises cortisol is not well established. So drink water because it is a sensible default, not because it is a stress-hormone treatment. Low-sugar electrolyte drinks can help during heavy sweating or illness, but on most days water does the job.

Warm milk before bed

Warm milk is a classic bedtime comfort, and there is no harm in it. The usual explanation, that the tryptophan in milk promotes sleep, is weaker than it sounds. The amounts involved are small, and the direct evidence is limited. What likely helps more is the routine, a warm and calming drink that signals the day is winding down. Plant-based versions work the same way.

Drinks to limit

A few drinks reliably push in the other direction:

• Strong coffee and energy drinks. Caffeine raises cortisol, though daily drinkers build partial tolerance (caffeine and cortisol). Keeping caffeine earlier in the day usually matters more than quitting.
• Alcohol. Drinking enough to reach intoxicating levels raises cortisol, and alcohol tends to unsettle sleep (alcohol and glucocorticoids).
• Sugary sodas and sweet coffee drinks. The issue is less a direct "cortisol spike" and more the blood-sugar swings and the stress-driven craving loop (sugar and stress).

For the full list of what to scale back, see foods that increase cortisol. For how drinks fit alongside meals, see the cortisol-lowering meal plan, and for the blood-sugar side, cortisol and blood sugar.

Frequently Asked Questions

Is there really a drink that lowers cortisol? Not in any dramatic sense. A few drinks, especially green tea with L-theanine, can modestly blunt the stress response, but none "flush" cortisol, and the effects are usually small and short-lived.

Does green tea lower cortisol? It may help a little. The L-theanine in green tea has reduced the acute cortisol response to stress in a trial, but green tea's caffeine pushes the other way, so the net effect is gentle rather than powerful.

What's the best drink before bed? A caffeine-free herbal tea like chamomile, or simply a warm drink as part of a wind-down routine. The benefit comes mostly from relaxation and better sleep.

Do ashwagandha drinks work? The evidence is preliminary, and ashwagandha carries real cautions, including rare liver-injury reports and avoidance in pregnancy. Check with a clinician before relying on it.

Does drinking more water lower cortisol? Hydration supports energy and mood and is a smart swap for sugary drinks, but the idea that mild dehydration meaningfully raises cortisol is not well established.

Medical disclaimer: This article is for informational purposes only. Always consult a qualified healthcare provider before making changes to your health routine.

Sources

1. Physiology, Cortisol — StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK538239/
2. Anti-Stress, Behavioural and Magnetoencephalography Effects of an L-Theanine-Based Nutrient Drink — PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC4728665/
3. Long-term Chamomile (Matricaria chamomilla L.) Treatment for Generalized Anxiety Disorder: A Randomized Clinical Trial — PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC5646235/
4. Ashwagandha — National Center for Complementary and Integrative Health (NCCIH). https://www.nccih.nih.gov/health/ashwagandha
5. Caffeine Stimulation of Cortisol Secretion Across the Waking Hours in Relation to Caffeine Intake Levels — PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC2257922/
6. Alcohol, Stress, and Glucocorticoids: From Risk to Dependence and Relapse in Alcohol Use Disorders — PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC5479733/
7. Excessive Sugar Consumption May Be a Difficult Habit to Break: A View From the Brain and Body — PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC4454811/

All sources accessed 24 May 2026.