Chamomile for Anxiety and Sleep: What the Evidence Shows

Chamomile is the bedtime cliché — the golden tea on the nightstand, the herb your grandmother swore by for nerves and sleep.

Here’s the honest version. The anxiety evidence is real and, for a herbal remedy, unusually rigorous: two double-blind, placebo-controlled trials from the University of Pennsylvania found a standardized chamomile extract beat placebo in people with generalized anxiety disorder. The sleep evidence is much thinner — smaller, lower-quality trials and systematic reviews that keep landing on the same verdict: not enough good data. And there’s a catch the tea aisle skips entirely: the trials that worked didn’t use tea. They used a concentrated pharmaceutical-grade extract at doses a mug can’t touch.

Does chamomile actually reduce anxiety?

This is the strongest part of the case, and it rests on genuinely controlled trials.

The first was a 2009 double-blind, placebo-controlled RCT (Amsterdam et al.) in the Journal of Clinical Psychopharmacology. Researchers randomized 57 outpatients with mild-to-moderate GAD to a standardized chamomile (Matricaria recutita) extract or placebo for 8 weeks. The chamomile group showed a significantly greater reduction in Hamilton Anxiety (HAM-A) scores than placebo (P = 0.047), with side-effect rates no different from placebo. The authors’ careful conclusion: chamomile “may have modest anxiolytic activity.” It was the first controlled trial of its kind — a real signal, not a folk claim.

A 2024 systematic review (Saadatmand et al.) in Clinical Nutrition Research pooled 10 clinical trials of oral chamomile for anxiety. Nine of the 10 concluded chamomile reduced anxiety. The proposed mechanism centers on apigenin, a flavonoid in chamomile thought to modulate the stress (HPA) axis and neurotransmitter pathways — the same broad target as conventional anxiolytics, at a fraction of the potency.

What did the big long-term trial actually find?

This is where the honest reading matters, because the headline and the fine print point in different directions.

The 2016 long-term RCT (Mao et al.), also from Penn, published in Phytomedicine, is the most ambitious chamomile study to date. 179 people with moderate-to-severe GAD took open-label chamomile extract — 1500 mg/day (a 500 mg capsule three times daily) — for 12 weeks. The 93 who responded were then randomized to keep taking chamomile or switch to placebo for 26 weeks, to test relapse prevention.

Here’s the information-gain the supplement copy skips: chamomile did not significantly beat placebo on its primary outcome. Fewer chamomile patients relapsed (15.2% vs 25.5% on placebo) and the hazard of relapse trended lower (hazard ratio 0.52), but the difference was not statistically significant (P = 0.16) — the trial was underpowered and placebo relapse ran lower than expected. What was significant: chamomile continuers maintained lower GAD symptoms than placebo (P = 0.0032), and the extract was safe over the full run. So the fair summary is a maintained-benefit signal, not a proven relapse-prevention effect. Encouraging, unfinished.

Does chamomile help you sleep?

This is the weaker half of the story, and it’s worth separating from the anxiety data.

The most-cited sleep trial is a 2017 study (Adib-Hajbaghery & Mousavi) in Complementary Therapies in Medicine. 60 nursing-home residents aged 60+ took chamomile extract (200 mg twice daily) or a wheat-flour control for 28 days. Sleep quality on the Pittsburgh Sleep Quality Index was significantly better in the chamomile group afterward. A positive result — but note the design limits: it was single-blind, the sample was small and elderly, and the comparator wasn’t a matched placebo. That’s a long way from proof.

Zoom out and the picture flattens. A 2020 systematic review of plant extracts for sleep (Guadagna et al.) in Evidence-Based Complementary and Alternative Medicine screened dozens of trials across seven compounds and concluded there is “a scarcity of evidence on the efficacy of each product.” Valerian and lavender had the most study behind them; chamomile’s sleep case was thinner still. The reviewers’ verdict was blunt: more high-quality research is needed before recommending any of these for sleep complaints. If you want the better-studied botanicals for the same job, the evidence on lavender for anxiety and magnesium for anxiety and sleep is worth comparing.

The tea-versus-extract gap nobody mentions

Here’s the practical catch. Every positive anxiety trial above used a standardized, pharmaceutical-grade extract — Mao’s dose was 1500 mg/day — not a tea bag. A cup of chamomile tea delivers a small, variable fraction of that apigenin content, and no trial has shown the tea itself moves clinical anxiety scores. So when a study says “chamomile works for GAD,” it’s making a claim about a concentrated capsule, not the mug on your nightstand. Whether the tea does anything measurable for anxiety is genuinely untested — the ritual and warmth may matter as much as the plant.

So should you try it?

The safety bar is low: across these trials, chamomile’s side-effect profile matched placebo, with no serious harms attributed to the extract. (The main caveat is a rare ragweed-family allergy and a theoretical interaction with blood thinners.) For short-term, mild anxiety, a standardized extract is a reasonable, low-risk experiment.

Just calibrate to the evidence. The anxiety case is modest but real; the sleep case is promising but unproven, and the tea is essentially a comfort ritual, not a studied dose. If chamomile helps you wind down, that’s a win — just don’t expect a capsule to fix anxiety or insomnia that’s rooted in an over-activated nervous system. Those drivers sit upstream of any herb, which is the whole premise behind training the system directly — see the saffron evidence for another herbal comparison, and the pillar guide on anxiety regulation and sleep restoration for the non-supplement tools that address the cause.