What Is Cramp Bark Good For?

Cramp bark is a deciduous shrub that belongs to the Adoxaceae family. It can grow up to 15 feet (5 meters) tall and 15 feet wide. It is often grown for its attractive white flowers that resemble snowballs and clusters of red berries.

The American variety of Viburnum opulus (also known as Viburnum trilobatum) has edible red berries, whereas the European variety bears bitter fruit.

The majority of cramp bark supplements are made exclusively from the bark of the plant, but some may include flowers or berries.

Cramp bark has been traditionally used as a remedy for various ailments:

• Cramps
  • Muscle spasms
  • Dysmenorrhea (menstrual cramps)
  • Cramps during pregnancy (to prevent miscarriage)
  • Premenstrual syndrome
• Urinary conditions that involve pain or spasms (uteritis and kidney stones)
• Diuretic (to increase urinary flow)
• Hysteria or anxiety
• Nervous disorders
• Scurvy (a disease caused by vitamin C deficiency)
• Cancer

The active compounds in cramp bark include coumarin, salicin, flavonoids, triterpenes such as ursolic acid, hydroxycoumarins, caffeic acid derivatives, phenol carboxylic acids, and tannins. These compounds have been shown to decrease muscle spasms, lower blood pressure, and decrease heart rate.

1. Relieves menstrual cramps

Cramp bark has antioxidant properties that can protect cells from oxidative damage and remove toxins from the liver and kidneys.

According to a study published in the Journal of Medicinal Chemistry, the antispasmodic properties of cramp bark are due to the presence of a coumarin derivative called scopoletin, which contains volatile oils to soothe and relax uterine cramps associated with the menstrual cycle. 

The bark also contains methyl salicylate, which is a weak-acting precursor to salicylic acid (similar to aspirin) but much less irritating to the gastric mucosa compared with some commonly used over-the-counter medications.

In addition, the astringent action of cramp bark also helps slow heavy menstrual bleeding, especially bleeding associated with menopause.

2. Provides postpartum relief

The antispasmodic action of cramp bark is beneficial for women who have gone through childbirth. The herb helps reduce muscle tension without inhibiting muscle function. It also relieves after-birth cramps and regulates heavy bleeding, preventing excessive blood loss.

3. Acts as a muscle relaxant

Antispasmodic compounds in cramp bark act efficiently on all types of muscle spasms, including bronchial, gastrointestinal, genitourinary, and skeletal muscle spasms. Taking cramp bark in conjunction with magnesium can relieve cramps caused by a wide variety of health conditions.

4. Boosts circulation

Cramp bark promotes increased circulation and blood flow. Muscles that are relaxed work more efficiently, and improved blood flow aids in the removal of waste products from the body. It has vasodilatory properties, meaning it helps widen the blood vessels, allowing blood to flow more easily, thus exerting a positive effect on blood pressure.

5. Promotes kidney function

Cramp bark fruit is rich in citrate, a compound often recommended by doctors for people who are at risk of kidney stones.

6. Supports the nervous system

Cramp bark restores the sympathetic and parasympathetic balance in voluntary and involuntary muscle spasms of the autonomic nervous system, which is vital to overall health.

7. Acts as a sedative

Cramp bark is rich in valerianic acid, which is most commonly associated with the sedative herb known as valerian. Its mildly sedative effect can be enhanced by combining it with other hormone-regulating sedative herbs.

Although no serious side effects linked to cramp bark supplements have been reported, they may cause digestive issues if consumed in large amounts.

Cramp bark is not recommended for the following:

• Young children
• Pregnant or lactating women
• People with aspirin sensitivity
• People on prescription medications (especially blood-thinning medications)

Cramp bark supplements can be purchased in tea, liquid extract, or capsule form.

Further studies are needed to fully understand safe and effective dosages, but the commonly preferred dose is as follows:

• Capsules: 3-4 grams/day
• Tincture: 2-3 mL/day

Always consult your doctor before you start taking any supplements.