Last verified: today
Cramp Bark
Also known as: Viburnum opulus, Guelder Rose, European Cranberry Bush, Snowball Tree
Evidence under review. — Not yet rated
Traditional herb used for menstrual cramps and muscle spasms. No rigorous clinical trials confirm its effectiveness.
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What it does
Cramp bark is a shrub whose bark has been used in traditional herbal medicine for centuries, primarily to relieve muscle spasms and menstrual cramps. It contains compounds like scopoletin and...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose
What the Science Says
Cramp bark is a shrub whose bark has been used in traditional herbal medicine for centuries, primarily to relieve muscle spasms and menstrual cramps. It contains compounds like scopoletin and viopudial that are thought to have antispasmodic and muscle-relaxing properties. However, no rigorous clinical trials have been conducted to confirm these effects in humans, so its use remains rooted in traditional practice rather than proven science.
What It Doesn't Do
Not proven to treat menstrual pain better than standard pain relievers. No clinical evidence it relieves PMS symptoms. Not a substitute for medical treatment of uterine or muscle conditions. No proven benefit for anxiety, sleep, or hormonal balance despite some marketing claims.
Absorption & Bioavailability
Unknown — no pharmacokinetic studies identified in the provided research data.
Red Flags to Watch For
- No clinical trials have tested cramp bark for safety or efficacy in humans — all use is based on traditional practice
- May interact with blood-thinning medications due to salicin-like compounds in the bark
- Products are not standardized, so potency varies widely between brands
- Pregnant women should avoid use without medical supervision despite traditional use during pregnancy
- Over 1,000 supplement products contain it, but none have FDA-reviewed evidence of effectiveness
Frequently Asked Questions
What does Cramp Bark do?
Traditional herb used for menstrual cramps and muscle spasms. No rigorous clinical trials confirm its effectiveness.
What is the effective dose of Cramp Bark?
No established dose
Is Cramp Bark safe?
No clinical trials have tested cramp bark for safety or efficacy in humans — all use is based on traditional practice
What doesn't Cramp Bark do?
Not proven to treat menstrual pain better than standard pain relievers.
Research Sources
- PMID 27677719
- General knowledge — limited published research available
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-07-05