The 4 Best Inulin Supplements of 2026
The best inulin for most people is Nutricost Organic Inulin Powder: 7 g of fiber a scoop for $0.39, $1.37 an ounce. We found no plain inulin powder on a public testing list; Benefiber Prebiotic Fiber Gummies use inulin and are on NSF/ANSI 173. For constipation, buy psyllium instead.
By Erin Rose Updated October 20, 2026 How we score
Our pick for: Most people
Nutricost Organic Inulin Powder
6.0/10 Our score
6.0/10, the top score of the 3 inulin powders we score
- Fiber
- 7 g a serving1 scoop (8 g)
- A serving
- $0.39brand list price
- In the jar
- Organic inulinunflavored, no sugar
- Jar
- 1 lb, $21.95$1.37 an ounce, iherb.com
- Per 10 g of fiber
- $0.56at list price
Why we pick it It has the top score of the 3 inulin powders we score. A scoop gives 7 g of fiber, so one scoop a day keeps you under the 10 g that healthy adults handled as a single test dose (Bonnema 2010). It costs $1.37 an ounce, less per gram of fiber than NOW’s organic inulin ($0.75 per 10 g).
What you give up A testing list: no plain inulin powder we found is on one. If that matters to you, the Benefiber gummies use inulin and are on one.
One more thing Inulin does little for constipation, and it makes gas. Start with a third of a scoop a day. How much to take.
Which inulin is right for you?
Costs are each brand’s list price, checked October 6, 2026. Prices on Amazon differ.
Want a small jar to try first?
Plain organic inulin in an 8 oz jar, 4 g of fiber in a level teaspoon, so it is easy to start small. $0.30 a teaspoon at NOW’s list price, $2.12 an ounce: more per ounce than our pick, but a smaller first buy.
NOW Organic Inulin Prebiotic Powder
4.5/10 · $16.99 for 8 oz · $0.30 a teaspoon
Want the lowest price per ounce?
$0.95 an ounce of powder, the least of the inulin powders we priced, in a 2.2 lb bag. A scoop is small, 2.3 g of fiber, which suits a slow start. It is sold as inulin and FOS, a shorter-chain form that is harder on the gut: keep it to 5 g a day or less (Bonnema 2010).
Micro Ingredients Organic Inulin FOS Powder
4.0/10 · $0.95 an ounce · $0.09 a serving
Want one on a testing list?
The top-scoring product with inulin that is on a public testing list (NSF/ANSI 173, which checks that what is inside matches the label). The fiber is inulin. It costs 2.5 times as much per gram of fiber as our powder pick, and has 2 g sugar a serving.
Benefiber Prebiotic Fiber Gummies
8.0/10 · $0.85 for 3 gummies · NSF/ANSI 173
Want a mix of prebiotic fibers?
7 g of fiber a scoop, $0.50 per 10 g.
Nutricost Prebiotic Fiber Powder, Unflavored
5.5/10 · $0.35 a serving
Want the cheapest inulin gummy?
5 g of fiber in 2 gummies, $1.41 per 10 g.
Physician's Choice Fiber Gummies
5.0/10 · $0.71 a serving
Want regularity?
Skip inulin: guidelines found it does little for constipation (AGA-ACG 2023; BDA 2025). Buy psyllium instead.
Konsyl Daily Psyllium Fiber Powder
9.0/10 · NSF/ANSI 173
If you buy psyllium: Take psyllium with a full glass of water. Do not take it if you have trouble swallowing. Take other medicines 2 hours before or after. All psyllium cautions
Of the inulin products here, only Benefiber’s gummies are on a public testing list (NSF/ANSI 173). Which fiber is on which list, with screenshots.
| Item | Value |
|---|---|
| Micro Ingredients inulin | $0.38 |
| Nutricost fiber blend | $0.50 |
| Nutricost inulin | $0.56 |
| NOW inulin | $0.75 |
| Physician's Choice gummies | $1.41 |
| Benefiber gummies | $1.42 |
The 6 inulin products we show, ranked
| Product | Score | Fiber | Per 10 g | Per oz | Testing list | Buy |
|---|---|---|---|---|---|---|
| Benefiber Prebiotic Fiber Gummiesgummy · 2 g sugar a serving | 8.0/10 | 6 g3 gummies | $1.42 | NSF/ANSI 173 | Buy on Amazon | |
| Nutricost Organic Inulin Powderpowder | 6.0/10 | 7 g1 scoop (8 g) | $0.56 | $1.37 | Not found* | Buy on Amazon |
| Nutricost Prebiotic Fiber Powderpowder, fiber blend | 5.5/10 | 7 g1 scoop (8 g) | $0.50 | $1.25 | Not found* | Buy on Amazon |
| Physician's Choice Fiber Gummiesgummy | 5.0/10 | 5 g2 gummies | $1.41 | Not found* | Buy on Amazon | |
| NOW Organic Inulin Prebiotic Powderpowder | 4.5/10 | 4 g1 level teaspoon (about 4 g) | $0.75 | $2.12 | Not found* | Buy on Amazon |
| Micro Ingredients Organic Inulin FOS Powderpowder, inulin and FOS | 4.0/10 | 2.3 g1 scoop (2.6 g) | $0.38 | $0.95 | Not found* | Buy on Amazon |
* Not found on the public NSF, USP or Informed lists (searched September 22, 2026 to October 6, 2026).
The score. Five marks: does a serving give at least 5 g of fiber, which we count as a full serving (our line); is the product on a public testing list; what 10 g of fiber costs against the cheapest in its group; does the label state the amounts; and any FDA recall naming the brand. Dose and testing are worth up to 3 points each, cost up to 2, label and recalls up to 1 each, for 10 in all. Scores checked October 12, 2026. How we score.
Not scored: Earthborn Elements Inulin FOS capsules (no store listing we could link to) and Anthony’s inulin (no label we could confirm). Reasons for each.
More: how much inulin to take, what inulin does and the best fiber of any type.
Sources
- Chang L, et al. AGA-ACG Clinical Practice Guideline: Pharmacological Management of Chronic Idiopathic Constipation. Gastroenterology. 2023. PubMed 37211380
- Dimidi E, et al. British Dietetic Association guidelines for the dietary management of chronic constipation in adults. J Hum Nutr Diet. 2025. PubMed 41081513
- Bonnema AL, et al. Gastrointestinal tolerance of chicory inulin products. J Am Diet Assoc. 2010. PubMed 20497775
- Labels: each brand’s page or the NIH Dietary Supplement Label Database. Testing: NSF/ANSI 173, NSF Certified for Sport, Informed Choice, Informed Sport and USP Verified, searched September 22, 2026 to October 6, 2026. Recalls: openFDA. Prices: each brand’s own list price (Walgreens or iHerb where named), checked October 6, 2026.