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Magnolia officinalis (Magnolia Bark Extract)
A traditional Chinese herb (honokiol/magnolol) marketed for stress and sleep. The honest verdict: human evidence is thin — one small RCT of a magnolia-phellodendron blend lowered cortisol and improved mood, but there are no meta-analyses and little testing of magnolia on its own.
What the evidence says
Most Magnolia Bark studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality randomised trials published 2006–2025 with a typical study size of 89 participants.
Based on 14 studies · 4 RCTs · 779 total participants
Confidence
Moderate confidenceBy outcome
Earns an emerging score because only a couple of small RCTs (the n=56 Relora cortisol/mood trial plus menopause-blend studies) test it in humans; most evidence is reviews, mechanism, and animal data with no meta-analyses.
2 trials ongoing or recruiting · 6 completed on ClinicalTrials.gov
Registered trials show research momentum for Magnolia Bark, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Magnolia Bark has been used in Traditional Chinese Medicine for anxiety and digestive complaints. Its compounds honokiol and magnolol modulate GABA-A receptors and may lower cortisol, with anxiolytic effects shown in animal studies.
The strongest human signal is a single small RCT (n=56) of Relora — a magnolia-plus-phellodendron blend — that reduced salivary cortisol and improved mood versus placebo; menopause studies likewise used multi-ingredient formulas.
So the calming claims are plausible but lightly evidenced: there are no meta-analyses, few human trials, almost none testing magnolia alone, and human bioavailability of honokiol/magnolol is still unestablished.
Enhances calming GABA activity
Lowers stress hormone levels
How Magnolia Bark works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Avoid — traditional use advises against
May have additive sedative effects
May enhance sedation A grade for this interaction is held for clinical review and has not been validated, so no severity is given. The precaution still applies: ask a pharmacist about the exact supplement and medicine. Do not stop or change prescribed medicines based on this notice.
Tip: Reduce dose; take in evening
Tip: Usually resolves
Magnolia Bark has an evidence score of 4.5/10 — emerging evidence based on 14 indexed studies. A traditional Chinese herb (honokiol/magnolol) marketed for stress and sleep. The honest verdict: human evidence is thin — one small RCT of a magnolia-phellodendron blend lowered cortisol and improved mood, but there are no meta-analyses and little testing of magnolia on its own. Representative study: PMID 21311416.
The commonly studied dose of Magnolia Bark is 200-400mg (standardized to 2% honokiol and magnolol). These are typical label doses. The only magnolia dose the cited trials state is 60 mg a day inside a combination tablet. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Magnolia Bark is before bed. Taking it with food is preferred. Magnolia bark contains honokiol and magnolol, biphenolic neolignans that act as positive allosteric modulators of GABA-A receptors.
Magnolia Bark is generally well-tolerated and considered safe for most healthy adults at recommended doses. Reported side effects are uncommon and include drowsiness, headache. Use caution if any of these apply to you: Known allergy or hypersensitivity to Magnolia Bark or related compounds; Pregnancy and breastfeeding; Concurrent use with sedative medications.
Ashwagandha
Likely helpsReduces cortisol and anxiety while improving sleep quality and physical recovery in stressed adults.
St. John's Wort
Likely helpsModulates serotonin, dopamine, and norepinephrine; studied for mood, with trials in mild-to-moderate depression comparing it to SSRIs — requires drug-interaction caution.
Lavender
Too few graded studiesAromatic botanical with well-documented anxiolytic, sleep-promoting, and mood-supporting effects. In one 77-person trial, anxiety scores fell 45% on oral Silexan and 46% on low-dose lorazepam, with no test of the difference reported, which does not show it can replace a prescribed anxiolytic.
Kava
Probably helpsKavalactones are studied for anxiety. A Cochrane review of 11 placebo-controlled trials found kava extract lowered anxiety scores more than placebo, but no trial cited here shows it works as well as a prescription anti-anxiety medication.
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Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 14 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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