Ranked by evidence

Best supplements for anxiety and everyday stress

Almost everything in this aisle promises calm, and very little of it has been tested properly. The list below is ordered by how strong the evidence is for this specific goal — anxiety and everyday stress — not by popularity or how good the marketing is. Nothing here replaces therapy or a proper assessment if anxiety is getting in the way of your life.

Evidence last reviewed: August 2026

Top picks

Option	Evidence	Best for	The honest note
Lavender Extract (Silexan)	Moderate evidence	generalised anxiety, without sedation	Multiple large placebo-controlled RCTs show meaningful anxiety reduction, including a comparison with an SSRI in GAD, without sedation or dependence.	View
Ashwagandha	Moderate evidence	everyday stress and cortisol	Trials point to lower stress, anxiety and cortisol; the effect looks real, but the studies are still small, so keep expectations modest.	View
Chamomile	Moderate evidence	steady, low-level anxiety over weeks	Standardised extract has replicated RCT support for reducing generalised anxiety over about 8 weeks. Its sleep reputation rests on much weaker data.	View

Solid options

Option	Evidence	Best for	The honest note
L-Theanine	Moderate evidence	acute nerves before a stressful task	Small but genuine reductions in acute stress and anxiety, plus better attention when paired with caffeine. Sleep claims are weaker than the marketing.	View
Milk Peptides (Lactium)	Moderate evidence	stress that shows up as poor sleep	Alpha-casozepine binds GABA-A benzodiazepine sites without their liabilities; small RCTs show modest drops in stress symptoms and better subjective sleep.	View

Situational

Option	Evidence	Best for	The honest note
L-Tyrosine	Moderate evidence	thinking clearly under acute stress	Protects working memory and mental flexibility when the brain is taxed by cold, noise or sleep loss. Does nothing measurable in rested, unstressed people.	View
Bifidobacterium Longum	Moderate evidence	low mood alongside IBS	Strain NCC3001 lowered depression scores in people with IBS; the generic B. longum in most capsules has not been shown to do the same.	View
St John's Wort	Strong evidence	when low mood, not anxiety, is the issue	Works about as well as standard antidepressants for mild-to-moderate depression and is better tolerated, but it interacts with a long list of medicines.	View

Popular for this goal — but the evidence says skip

CBD (Cannabidiol) Limited evidence
Genuinely effective for rare epilepsies, but the anxiety and sleep evidence is thin and inconsistent at the doses sold over the counter.
GABA Limited evidence
Oral GABA barely crosses the blood-brain barrier, and the stress trials behind it are small, short and often funded by GABA manufacturers.
Kava Moderate evidence
Older meta-analyses were positive, but the largest modern trial was flatly negative and kava carries a regulator-recognised liver-toxicity signal.
Rhodiola Rosea Limited evidence
The fatigue trials are small and mostly at high risk of bias, and the one rigorous depression trial found it no better than placebo.
Bach Flower Remedies Limited evidence
Systematic reviews find no effect beyond placebo, and test anxiety, the most-studied use, came out negative.
Adrenal Support Formulas Limited evidence
Adrenal fatigue is not a recognised condition, and testing of these products found undeclared hormones in them.

Our verdict

If you try one thing, make it Silexan lavender extract — it has the largest and most consistent anxiety dataset of anything on this page. Ashwagandha and standardised chamomile are the sensible next choices for ongoing everyday stress.