Black currant fiber

Prebiotic

What is it

Black currant fiber is the dietary fiber from black currant (Ribes nigrum) berries, often supplied as a byproduct of juice manufacturing. It contains insoluble and soluble fiber plus residual anthocyanins and polyphenols.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Bowel regularity (general fiber benefits)

Strong Evidence

Dietary fiber supplementation in general has well-established effects on stool frequency and consistency.

How it works

Dietary fiber adds bulk to stool, slows nutrient absorption, and supports beneficial gut bacteria through colonic fermentation. Soluble fibers form viscous gels that can slow glucose absorption and bind bile acids. Residual berry polyphenols add antioxidant activity.

Dosage

Typical fiber supplement doses range from 3-10 g/day. Black currant fiber is often added to fiber blends at variable amounts.

When and how to take it

Take with adequate water. May be taken with or between meals; spacing from medication doses is advisable.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Powder

Mixed into water or other liquids.

Acts in GI tract; not absorbed intact

Safety

Generally well tolerated. Common side effects include gas and bloating, especially when starting at higher doses. Drink adequate water with any fiber supplement.

Who should be cautious

Caution in severe constipation, intestinal obstruction, or strictures. People on chronic medications should space them from fiber intake.

Interactions

Fiber can slow absorption of co-administered medications. Take medications separately (1-2 hours before fiber).

Food sources

Black currants (fresh)

Amount
5.9 g fiber per 1 cup
%DV
21%

Frequently asked questions

Is black currant fiber better than other fiber sources?⌄

It provides fiber plus residual polyphenols. Functionally similar to other plant fibers for bowel benefits.

Is it safe?⌄

Yes, at typical doses with adequate water. Start low and increase gradually to minimize gas.

References

Black currant fiber on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Black currant fiber (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.