Butternut

BotanicalBest before bed

What is it

Butternut (Juglans cinerea) is a North American tree in the walnut family; the bark of the inner trunk and root has been used traditionally as a mild laxative and bitter tonic. It is distinct from butternut squash.

Evidence for 1 use

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Occasional constipation

Mixed Evidence

Traditional use as a stimulant laxative; no modern controlled trials. Effects extrapolate from the broader stimulant laxative class.

How it works

Butternut bark contains naphthoquinones (juglone, plumbagin-related compounds), tannins, and resin acids. The naphthoquinones act as stimulant laxatives by irritating the colonic mucosa and stimulating peristalsis. Traditional use is for short-term constipation; long-term use is generally discouraged in herbal medicine.

Dosage

No RDA. Traditional doses are 1-2 g of dried bark as a decoction, or 1-3 mL of tincture, typically as a single evening dose.

When and how to take it

Stimulant laxatives are usually taken at bedtime; effects typically occur in 6-12 hours.

1 commercial form

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Bark decoction or tincture

Traditional preparation.

Naphthoquinones act on colonic mucosa.

Safety

Like other stimulant laxatives, prolonged use can cause electrolyte imbalance, dependence, and melanosis coli. Possible GI cramping and watery stool. Long-term use is discouraged. Naphthoquinones may cause skin irritation on contact.

Who should be cautious

Pregnancy: avoid due to potential uterine stimulation. Lactation: limited data, avoid. Anyone with intestinal obstruction, IBD, or known electrolyte imbalance should not use stimulant laxatives.

Interactions

Theoretical interactions with diuretics and cardiac glycosides (digoxin) due to potassium loss with chronic use. Avoid concurrent use with other stimulant laxatives.

Frequently asked questions

Is butternut the same as butternut squash?⌄

No. Butternut refers to a tree (Juglans cinerea); butternut squash is a winter squash (Cucurbita moschata).

Can I use butternut bark long-term?⌄

No. Like other stimulant laxatives, it should be used short-term only to avoid dependence and electrolyte issues.

References

Butternut on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Butternut (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.