Magnolia Bark
Herb ·Exploratory record · not publication-reviewed ·Updated July 13, 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.
Exploratory record, not a reviewed medical publication.
See the editorial and medical-review policies for the publication gate.
This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Magnolia Bark is a herb most often used for may promote relaxation, may reduce perceived stress in combination formulas, may support sleep onset when stress-related. NutriStack rates the overall evidence as emerging. A typical adult dose is 100-300 mg/day standardized magnolia bark extract; combination Relora-style products often use 250 mg two to three times daily, commonly taken as standardized magnolia officinalis bark extract with disclosed honokiol and magnolol content. This profile indexes 3 sources.
- 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 0 interaction records on file.
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
Dosing & protocol.
Can be taken with or without food. Evening dosing is preferred initially because drowsiness can occur.
What it actually costs.
Real-world pricing across three quality tiers. Assumes Standardized magnolia bark extract.
High-honokiol extracts and branded combination products cost more than bulk bark powders. Updated 2026-06-04.
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
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 subjectsTalbott 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 trialKalman 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 ReviewWoodbury A et al. · Frontiers in Neurology · 2013
Review summarized honokiol effects on GABAergic signaling, anxiety models, pain, and neuroinflammation.
Common questions.
Quick answers about Magnolia Bark, drawn from the data on this page.
What is Magnolia Bark?
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 is Magnolia Bark used for?
Commonly cited benefits of Magnolia Bark include: May promote relaxation; May reduce perceived stress in combination formulas; May support sleep onset when stress-related; May ease stress-related digestive tension. NutriStack rates the overall evidence as emerging.
What is a typical dose of Magnolia Bark?
A typical adult dose of Magnolia Bark is 100-300 mg/day standardized magnolia bark extract; combination Relora-style products often use 250 mg two to three times daily. The commonly recommended form is Standardized Magnolia officinalis bark extract with disclosed honokiol and magnolol content. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Magnolia Bark?
Reported side effects include drowsiness, dizziness, headache, heartburn, dry mouth, gi upset. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Magnolia Bark?
NutriStack rates this as Emerging, meaning early RCT signal, mechanistic data, or limited human evidence. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
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.