We鈥檝e all heard it: chamomile tea is what you drink if you have difficulty falling asleep. This bit of folkloric wisdom has been repeated so many times, it must be true, right?
听over the age of 15 has trouble falling into the arms of Morpheus or staying asleep. Chamomile tea, if it can pull off the spectacular feat of resolving this epidemic, would become an herbal hero. Chamomile is a type of plant that has a long, varied history of being used as a panacea, a supposed cure-all. It鈥檚 said to be a remedy for infections, like chickenpox and the common cold; for inflammation, like gingivitis; for neurological issues such as anxiety and insomnia; for ulcers, acne, diaper rash鈥� basically, it seems chamomile was the medical duct tape of the pre-MacGyver days.
Now, anecdotes can be the spark that initiates scientific inquiry, but they should not be held as reliable evidence. So can science tell us if drinking chamomile tea will help you sleep?
I was able to find three randomized controlled trials that looked at the interplay between chamomile and sleep. The 2016听听in Taiwan randomized 40 women who had just given birth to drinking one cup of chamomile tea a day for two weeks, whereas another 40 postpartum women got nothing. While the tea group got better scores on their sleep questionnaires, that difference went away four weeks after they stopped drinking the tea. A year later, a different trial was published by听, reporting on the positive impact of chamomile in the elderly, but it wasn鈥檛 from drinking tea. Researchers gave participants capsules containing 400 mg of chamomile, twice a day, while the control group received nothing. The influence of receiving some kind of treatment cannot be discounted: I wish both trials had used placebo drinks or placebo pills in their control group.
These positive signals are encouraging, but they must be contrasted with the findings of听听in 2011. Their patients received chamomile capsules twice a day for a month and also kept a sleep diary. This allowed the researchers to conclude there was no difference in how fast these patients fell asleep, or how much sleep they got (on top of many other sleep-related variables) when compared to participants receiving a placebo.
You may be wondering how much chamomile was in those pills. Zick听et al.听reported in their article that each daily dose represented 15 grams of chamomile flowers. They concluded that 鈥渢his amount could not feasibly be delivered as a tea and could only be achieved using a concentrated extract.鈥�
Although results so far have been somewhat disappointing, I鈥檓 not ready to write off chamomile entirely. You see, this herb is made up of听, including apigenin which has an affinity for the same cellular receptors used by minor tranquilizers. Is chamomile the new Xanax?
A particularly thorough clinical trial was conducted in 2009 at the University of Pennsylvania known as听听The researchers excluded from the trial anyone who was already on anti-anxiety medication; the placebo pill bottles they gave participants had a drop of chamomile oil inside the lid to make it harder to tell to which arm of the trial participants had been assigned; and the data analysis itself was blinded. Such robust work yields confidence in the results, and the results were鈥μ� sure, there was a reduction in anxiety for people who got the chamomile pills, but the overlapping of听anxiety scores with those of the placebo group leaves me a little disappointed. Moreover, the lower dose of chamomile was counterintuitively more poorly tolerated than the high dose, which makes me think the results are particularly noisy.
Given this underwhelming performance by chamomile, how can we explain that some people swear by its soothing properties? Drinking tea can鈥檛 be boiled down to the mere ingestion of molecules (pun intended). It鈥檚 often a ritual. We boil the water. We take out the fragrant tea pouch. We smell the tea as it steeps. We wrap our hands around the warm mug and drink a hot beverage. The ceremony itself calms us down. What I would like听to see in the scientific literature is a comparison between drinking chamomile tea鈥� and drinking hot water. (A听听and found that 鈥渞elaxation scores increased after drinking either beverage.鈥�)
In the meantime, we may discover interesting properties of specific compounds found in chamomile, such as apigenin. If these components are potent enough, and safe enough, they could enter the drug development pipeline and, one day, become a standardized treatment, with a well-understood pharmacological profile, in much the same way that the discover of salicylic acid in willow bark led to the development of aspirin听(acetylsalicylic acid). But we need strong, reproducible positive results first.
Does this mean we should stop drinking chamomile tea? Absolutely not. If you enjoy the taste (and aren鈥檛 allergic to it, as some people are), drink away. But we shouldn鈥檛 let historical and anecdotal evidence trump scientific data. Next time you want to pull yourself closer to sleep, boil the water but withhold the tea bag. See how you feel. You might be surprised at the power of age-old rituals.
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