Setting expectations
Natural doesn't mean weak, but it also doesn't mean miraculous. These supplements have milder effects than medication. They work best for mild-to-moderate anxiety, or as part of a broader approach including practice and technique.
If you don't want prescription medication, or can't take it, there are natural options worth considering. Here's what the evidence actually shows.
Tier 1: Strongest evidence
L-theanine
An amino acid found in green tea. Promotes alpha brain waves — the same pattern seen during meditation. Creates "calm alertness" without sedation.
- Dose: 100-200mg
- Timing: 30-60 minutes before
- Evidence: Multiple studies show reduced heart rate and cortisol under stress
- Side effects: Generally well-tolerated; rare headaches
- Note: Available in supplement form or via green tea (though tea contains much less)
Magnesium
Many people are deficient, and deficiency worsens anxiety. Supplementation may help — but mainly if you're deficient.
- Dose: 200-400mg (glycinate or citrate forms best absorbed)
- Timing: Daily supplementation, not acute use
- Evidence: Modest evidence for anxiety reduction, mainly in deficient individuals
- Side effects: High doses can cause digestive issues
- Note: Won't help much acutely; best as ongoing support
Tier 2: Some evidence
Ashwagandha
An adaptogen used in Ayurvedic medicine. Research suggests it lowers cortisol over time.
- Dose: 300-600mg (KSM-66 or Sensoril extracts studied)
- Timing: Daily for several weeks for full effect
- Evidence: Some studies show reduced cortisol and anxiety; not for acute use
- Side effects: Generally safe; avoid with thyroid conditions
Lavender (Silexan)
Oral lavender oil capsules (brand: Kalms Lavender in UK, Lavela in US) have some anxiety research.
- Dose: 80mg (standardised Silexan)
- Timing: Daily use, though some acute benefit reported
- Evidence: Comparable to low-dose benzos in some studies (though this is debated)
- Side effects: Lavender burps; otherwise well-tolerated
Tier 3: Weaker or mixed evidence
Valerian
Traditional herb for sleep and anxiety. Evidence for anxiety is weak. Often causes drowsiness — not ideal before presenting.
Passionflower
Some small studies suggest anxiety benefits, but evidence is limited. May cause drowsiness.
Kava
Has anxiety evidence, but liver safety concerns have led to it being banned in some countries. Not recommended.
CBD
Popular but evidence is mixed. One study showed benefit for public speaking anxiety at high doses (300mg), but quality varies wildly and it's expensive. May cause fatigue.
What about chamomile tea?
Chamomile contains apigenin, which binds to GABA receptors. However, the amounts in a cup of tea are very small. It might help you relax before bed the night before, but don't expect it to stop trembling hands.
Combining approaches
Natural supplements work best combined with:
- Breathing techniques: Physiological sighs, box breathing
- Practice: Exposure is the strongest anxiety reducer
- Sleep: Anxiety is always worse when sleep-deprived
- Caffeine management: Cut caffeine the day of your presentation
Natural supplement summary
- Best evidence: L-theanine (100-200mg, 30-60 min before)
- For ongoing support: Magnesium, ashwagandha (daily)
- Avoid: Anything that causes drowsiness if you need to perform
- Manage expectations: Effects are milder than medication