ModerateSynergy
Melatonin
Both can promote sleepiness and may cause next-day grogginess.
Recommendation: Use low evening doses and avoid driving if morning sedation occurs.
Magnolia Bark
Herb ·Emerging evidence ·Reviewed May 2026
Magnolia bark is a traditional Magnolia officinalis bark preparation used for stress, anxiety, sleep, and digestive tension. Human evidence is limited mostly to proprietary magnolia plus phellodendron combinations, while honokiol and magnolol have stronger preclinical evidence for GABA-A and neuroinflammatory pathways. It can cause sedation and should be used cautiously with alcohol, sleep aids, anxiolytics, and other calming supplements.
What it's good for
What to watch for
- Drowsiness
- Dizziness
- Headache
- Pregnancy and breastfeeding
- Use with sedatives, alcohol, benzodiazepines, opioids, or sleep medications without clinician guidance
The bottom line
Evidence rating emerging. Most-documented uses: may promote relaxation, may reduce perceived stress in combination formulas, may support sleep onset when stress-related. 3 sources indexed (2008–2013), with 3 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Honokiol and magnolol interact with GABA-A receptor signaling, inflammatory pathways, and stress-related neuroendocrine systems in preclinical models. Combination human studies suggest possible reductions in transient anxiety, perceived stress, or cortisol exposure, but these data cannot fully isolate magnolia bark alone. Sedation and additive CNS effects are the main practical safety concerns.3
Class
Honokiol and magnolol calming botanical
Found in food
No common food source; used as bark extract or traditional decoction
Low-status signs
None - magnolia bark is not an essential nutrient and has no deficiency state
Dosing
Dosing & protocol.
Common range
100-300 mg/day standardized magnolia bark extract; combination Relora-style products often use 250 mg two to three times daily
Recommended form
Standardized Magnolia officinalis bark extract with disclosed honokiol and magnolol content
Can be taken with or without food. Evening dosing is preferred initially because drowsiness can occur.
Forms
Forms & what to buy.
Ranked by evidence and value.
Standardized Honokiol/Magnolol Extract Recommended
Best for consistent active lignan exposure. Start in the evening to assess sedation.
Magnolia plus Phellodendron Blend
Human trial evidence is mostly with this combination, but phellodendron adds berberine-like constituents. Take with or without food.
Traditional Bark Decoction
Potency varies widely and is not directly comparable to standardized extracts. Use product-specific instructions.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes Standardized magnolia bark extract.
BudgetBest value
$5 /mo
$0.18 per dose
Mid
$14 /mo
$0.45 per dose
Premium
$33 /mo
$1.10 per dose
High-honokiol extracts and branded combination products cost more than bulk bark powders. Updated 2026-06-04.
Goals
Goal-based dosing.
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Anxiety
48% relevance
Honokiol and magnolol may modulate GABA-A signaling and stress pathways.3,2
MoodEmerging evidenceStandardized bark extract
Appropriate only for mild stress support, not severe anxiety alone.
Difficulty falling asleep
45% relevance
Calming GABAergic effects may reduce stress-related sleep latency.3
SleepEmerging evidenceEvening honokiol/magnolol extract
Avoid combining with sedative drugs without supervision.
Stress-related digestive tension
32% relevance
Traditional use and smooth-muscle effects may support nervous stomach symptoms.1,2
DigestiveInsufficient evidenceTraditional bark extract
Persistent abdominal pain, bleeding, or weight loss needs evaluation.
Safety
Full safety detail.
Side effects
- Drowsiness
- Dizziness
- Headache
- Heartburn
- Dry mouth
- GI upset
Contraindications
- Pregnancy and breastfeeding
- Use with sedatives, alcohol, benzodiazepines, opioids, or sleep medications without clinician guidance
- Before surgery because of sedation concerns
- Driving or operating machinery until individual response is known
Interactions
Interaction records.
InfoSynergy
L-Theanine
Both may support calm with generally mild tolerability concerns.
Recommendation: Start at low doses during a low-risk time to assess alertness.
ModerateCaution
Ashwagandha
Both are used for stress and may add sedation or fatigue.
Recommendation: Avoid high-dose daytime stacking until individual response is clear.
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Randomized controlled trials
2- 1Effect of Magnolia officinalis and Phellodendron amurense (Relora) on cortisol and psychological mood state in moderately stressed subjectsNeeds reviewNo linkTalbott SM et al. · Journal of the International Society of Sports Nutrition · 2013
Combination extract reduced cortisol exposure and improved several mood-state measures.
- 2Effect of a proprietary Magnolia and Phellodendron extract on stress levels in healthy women: a pilot, double-blind, placebo-controlled clinical trialNeeds reviewNo linkKalman DS et al. · Nutrition Journal · 2008
Relora reduced state anxiety but did not significantly improve sleep outcomes versus placebo.
Reviews & position papers
1- 3Neuro-Modulating Effects of Honokiol: A ReviewNeeds reviewNo linkWoodbury A et al. · Frontiers in Neurology · 2013
Review summarized honokiol effects on GABAergic signaling, anxiety models, pain, and neuroinflammation.
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Magnolia Bark in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.