Ever had one of those days when your shoulders creep up to your ears? A warm cup of tea feels like a lifeline. People have leaned on comforting drinks for centuries. But can drinks to lower cortisol really change what happens inside your body?
Your body makes cortisol on a daily basis. You need it to stay alert and manage stress. Many drinks are promoted online as ‘cortisol-lowering,’ but the evidence is much more limited. Science is more careful. Here’s what the research shows for five popular stress drinks and where the evidence is weaker.
Quick Byte: No drink cures stress. Limited research has shown green tea, black tea, and vitamin C drinks in relation to cortisol or stress responses, but findings are not strong enough to recommend any drink as a cortisol-lowering treatment. Treat them as helpers, not fixes.
What Is Cortisol, and Do Cortisol Drinks Really Work?
Cortisol is your body’s main stress hormone. Your adrenal glands make it, and it helps manage blood sugar, immune activity and blood pressure [1].
Here’s how the parts connect. When stress hits, your brain signals a small gland called the pituitary. The pituitary then signals your adrenal glands, and they release cortisol. When the stress passes, levels should fall [1]. Trouble starts when stress never switches off. Long-term stress keeps cortisol high, and that may upset the balance of your gut bacteria [5].
So do cortisol drinks work? Somewhat. The studies are small and short, usually six weeks to two months. A drink can support your routine, but it can’t replace sleep, movement or medical care.
5 Drinks to Lower Cortisol, Backed by Cortisol Research
Here are five drinks to lower cortisol that scientists have tested. Each one comes with a note on how strong the evidence looks.
1. Green Tea: A Popular Way to Reduce Cortisol
In one small study, teenagers drank about six cups of decaf green tea a day for six weeks. By the end, their cortisol had dropped and they felt less stressed [2]. Green tea has a calming compound called theanine, which may play a part [2].
Six cups is a lot, though, and the group was small. Think of the result as a promising hint, not a promise. Try two or three cups a day, and skip the sugar. The study used plain tea [2]. If you have liver problems or take regular medicines, check with your doctor first.
2. Black Tea: A Stress Drink That May Help You Settle Faster
Researchers gave healthy men either four cups of black tea a day or a look-alike drink with no tea in it. After six weeks, tough tasks stressed both groups equally. The difference showed up afterward. The tea drinkers’ cortisol dropped lower, and they felt calmer [3].
So black tea may not stop stress from hitting. It may help you recover more quickly. The study only included healthy men, so we can’t say the same for everyone.
3. Water
Scientists noticed that people who drink less water tend to have higher cortisol. Their bodies also make more of a hormone that helps hold on to water [4].
Your body may read low fluids as a mild stress. Many of us are slightly dehydrated without knowing it, because thirst only kicks in after we’ve already lost some water [4]. This is a link, not proof that extra water lowers cortisol. But water is cheap and safe, so keep a bottle nearby.
4. Fermented and GABA-Rich Drinks
GABA (gamma-aminobutyric acid) is a natural chemical that calms nerve activity in the brain. Some fermented foods and drinks contain it, and gut bacteria make some to.
In one small trial, people drank a beverage with added GABA. Afterwards, they had lower cortisol after a mentally tiring task than people who drank a plain drink. For probiotic drinks like kefir, most evidence comes from mice, not humans [5].
Note: Experts also point out that many GABA trials are small, and some carry possible conflicts of interest [5]. Unsweetened kefir or buttermilk (chaas) is easy to try, but the human proof for cortisol is still thin.
5. Vitamin C Drinks
In a two-month study, women with high cortisol from long-term stress took 1,000 mg of vitamin C every day. Their cortisol came down. In one group it fell from 780 to 446 nmol/L. Women who didn’t take it saw no real change [6].
That was a supplement, though. A glass of orange juice or nimbu pani has far less vitamin C, and nobody has tested those drinks for cortisol. High doses aren’t right for everyone, so ask your doctor first.
What About Coconut Water?
Coconut water is rich in potassium, a mineral that helps your muscles and nerves work. So why bring it up in a post about cortisol?
Because very high cortisol can drain potassium from the body. In a study of 195 people with Cushing’s disease, a serious condition where the body is exposed to too much cortisol, about one in four had low potassium. Those with higher cortisol tended to have lower potassium [7].
Most healthy people don’t have this problem. Coconut water is a tasty way to hydrate, but there’s no good evidence that it lowers cortisol. It didn’t make our list of five for that reason.
How to Use Cortisol Drinks Wisely?
Pick the drinks to lower cortisol that fit your day. Sip water in the morning and have tea in the afternoon.
- Keep drinks unsweetened when you can.
- Pair them with sleep, a short walk, and a few slow breaths.
- Don’t chase one “perfect” stress drink. Steady habits matter more.
Note: Persistent or unusual symptoms such as unexplained weight gain around belly, muscle weakness, muscle loss, high blood pressure, or high blood sugar warrant medical evaluation. Very high cortisol can cause these signs, and no drink can treat them [1].
Note: No drink can treat an underlying cortisol-related medical condition. But a glass of water and a calming cup of tea can help.
FAQs
Can certain drinks help lower cortisol levels?
Some drinks, such as water, unsweetened green tea, orange juice, and herbal teas, may aid in stress management but do not immediately or reliably reduce cortisol. Also, staying hydrated and cutting back on excess caffeine and sugary drinks may help maintain a balanced stress response.
Is there a link between GABA (gamma-aminobutyric acid) and cortisol?
Yes. Gamma-aminobutyric acid (GABA) calms nerve activity in the brain. When GABA signals drop, the brain keeps telling the body to make cortisol so levels can stay high [5].
Can gut bacteria make GABA?
Yes. Gut bacteria such as Lactobacillus, Bifidobacterium, and Bacteroides can make GABA. This is one reason scientists study the gut and stress together [5].
What time of day is cortisol highest?
Cortisol peaks around 8 AM and dips lowest between midnight and 4 AM [8]. A high morning reading is normal.
Are cortisol and adrenaline the same thing?
No. Adrenaline is the quick alarm that hits within seconds. Cortisol is the slower follow-up that keeps you alert for longer.
Can cortisol be too low?
Yes. In Addison’s disease, the body makes too little cortisol. It can cause tiredness, low blood pressure, and weight loss [1]. Talk to your doctor if you notice these signs together.
Does high cortisol cause belly fat?
Very high cortisol, as in Cushing’s syndrome, can cause weight gain around the middle [1]. For everyday stress, the link is less clear.
Disclaimer: This post is for general awareness and isn’t medical advice. Drinks can’t diagnose or treat any condition. Talk to your doctor before you change your diet or start supplements.
References:
1. Kaur J, Gandhi J, Sharma S. Physiology, cortisol. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan– [updated 2025 Dec 1; cited 2026 Sep 29]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK538239/
2. Almudhi A, Gabr SA. Green tea consumption and the management of adrenal stress hormones in adolescents who stutter. Biomed Rep. 2022 Feb 24;16(4):32. doi:10.3892/br.2022.1515 [cited 2026 Sep 29]. Available from: https://www.spandidos-publications.com/10.3892/br.2022.1515
3. Steptoe A, Gibson EL, Vuononvirta R, Williams ED, Hamer M, Rycroft JA, et al. The effects of tea on psychophysiological stress responsivity and post-stress recovery: a randomised double-blind trial. Psychopharmacology (Berl). 2007 Jan;190(1):81–9. PMID:17013636 [cited 2026 Sep 29]. Available from: https://pubmed.ncbi.nlm.nih.gov/17013636/
4. Armstrong LE, Muñoz CX, Armstrong EM. Distinguishing low and high water consumers—a paradigm of disease risk. Nutrients. 2020 Mar 23;12(3):858. doi:10.3390/nu12030858 [cited 2026 Sep 29]. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7146321/
5. Liwinski T, Lang UE, Brühl AB, Schneider E. Exploring the therapeutic potential of gamma-aminobutyric acid in stress and depressive disorders through the gut–brain axis. Biomedicines. 2023 Nov 24;11(12):3128. doi:10.3390/biomedicines11123128 [cited 2026 Sep 29]. Available from: https://www.mdpi.com/2227-9059/11/12/3128
6. Beglaryan et al. Vitamin C supplementation alleviates hypercortisolemia caused by chronic stress. Stress Health. 2023 Nov 27 (first published);40(3):e3347. doi:10.1002/smi.3347 [cited 2026 Sep 29]. Available from: https://onlinelibrary.wiley.com/doi/10.1002/smi.3347
7. Fan L, Zhuang Y, Wang Y, Liu X, Liu D, Xiang B, et al. Association of hypokalemia with cortisol and ACTH levels in Cushing’s disease. Ann N Y Acad Sci. 2020 Mar;1463(1):60–6. doi:10.1111/nyas.14205. PMID:31456238 [cited 2026 Sep 29]. Available from: https://pubmed.ncbi.nlm.nih.gov/31456238/
8. Chourpiliadis C, Aeddula NR. Physiology, glucocorticoids. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan– [updated 2023 Jul 17; cited 2026 Sep 29]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK560897/
(The article is written by Nancy Dixit, Associate Manager, Clinical Health & Content, Medical Affairs, and reviewed by Monalisa Deka, Deputy Manager, Clinical Health & Content, Medical Affairs.)
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