Best Inulin (prebiotic fiber)
The best inulin (prebiotic fiber) we track, ranked by real cost-per-dose — not paid placements. Across 4 brands, none carry a certification we could verify in a public registry.
Updated October 2026prices checked what’s changed
How much does Inulin (prebiotic fiber) cost?
Inulin (prebiotic fiber) costs a median $0.20 per serving — the cheapest of the 4 we can price per dose is $0.10 per serving. Prices checked October 2026.
Ranked across 4 products · prices checked Oct 10, 2026
How we rank
We rank by cost-per-dose — price ÷ servings, normalized to the daily dose — so bottle sizes and strengths compare fairly. Prices are scraped at publication and re-checked when the catalog refreshes (see the “Prices checked” stamp above). There is no paid placement and no kickback for ordering. Full methodology · Editorial standards.
When cheapest ≠ best value
The cheapest bottle isn’t automatically the best value: a low per-bottle price usually just means fewer servings or a smaller dose per serving. That is exactly what cost per dose normalises, which is why the ranking above is ordered by it rather than by sticker price. A bigger bottle isn’t automatically cheaper per dose either — this list already ranks by cost per dose, so a larger count only wins if it truly costs less per serving. Compare Inulin (prebiotic fiber) forms.
Our data on this: how much the big bottle saves per serving · the gummy tax · the form premium · the price spread.
Full ranking by cost per dose
Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly.
- See offer#1Best valueNow Supplements, Prebiotic Inulin Fiber, 180 Veg…
capsule · 1serving · 180 servings · $17.40
$0.10per serving - See offer$0.18per serving1.8× #1
- See offer$0.22per serving2.3× #1
- See offer$0.31per serving3.2× #1
| # | Product | Form · dose | Tested | Servings | Price | $ / serving | Buy |
|---|---|---|---|---|---|---|---|
| 1 | Now Supplements, Prebiotic Inulin Fiber, 180 Veg…Best value | capsule · 1serving | 180 | $17.40 | $0.10 | See offer | |
| 2 | KOS Organic Inulin Powder | powder · 1serving | 112 | $19.99 | $0.18 1.8× #1 | See offer | |
| 3 | Sprout Living Organic Inulin with FOS Prebiotic Powder | powder · 1serving | 90 | $19.95 | $0.22 2.3× #1 | See offer | |
| 4 | Wild & Organic Chicory Root Capsules - Digestive & Gut… | capsule · 1serving | 90 | $27.79 | $0.31 3.2× #1 | See offer |
See also: Inulin (prebiotic fiber) basics · all best-value rankings
Read: Inulin (prebiotic fiber) guides
Inulin (prebiotic fiber) brands we compare — which are third-party tested?
None of the 4 brands ranked above appear in the USP, NSF or Informed-Sport public registries. We don't count a "lab tested" claim printed on a label as third-party testing.
Frequently asked
How much does Inulin (prebiotic fiber) cost?+
The cheapest inulin (prebiotic fiber) we track is $0.10 per serving ($17.40 for 180 servings), against a typical $0.20 per serving across the 4 we can price per dose — about $2.90 a month at the cheapest. That's real cost per dose from live Amazon US prices as of October 2026, not the sticker price.
What is the best-value Inulin (prebiotic fiber) supplement?+
Now Supplements, Prebiotic Inulin Fiber, 180 Veg Capsules — $0.10 per serving ($17.40 for 180 servings), the lowest cost-per-dose inulin (prebiotic fiber) in our Amazon US catalog as of October 2026.
How much does Inulin (prebiotic fiber) cost per day?+
The cheapest inulin (prebiotic fiber) we track works out to $0.10 per serving, against a typical $0.20 per serving across the 4 we can price per dose. Retailers and review sites list a price and a serving size but rarely divide it out — this is what a day actually costs, as of October 2026.
What is the typical cost per dose for Inulin (prebiotic fiber)?+
About $0.20 per serving across the 4 inulin (prebiotic fiber) products we can price per dose (combination products are left out — their single label dose belongs to whichever ingredient the product is built around) — the cheapest we track is $0.10 per serving, with most falling between $0.16 and $0.24.
Does the cheapest Inulin (prebiotic fiber) have everything you need?+
Not always — inulin (prebiotic fiber) formulas vary in which ingredients and doses they include, so compare the labels alongside price. We rank by cost per serving as the value baseline: Now Supplements, Prebiotic Inulin Fiber, 180 Veg Capsules is the lowest at $0.10 per serving as of October 2026.
What is the highest-quality Inulin (prebiotic fiber) supplement?+
None of the 4 inulin (prebiotic fiber) brands ranked here carry a USP, NSF or Informed-Sport certification we could confirm in the public registries as of October 2026. That does not make them bad — most supplement brands never submit to voluntary testing — but if independent verification matters to you, check the registries linked below before buying.
Which Inulin (prebiotic fiber) brands are third-party tested?+
None of the 4 brands on this page appear in the USP, NSF or Informed-Sport public registries. We never count a "lab tested" claim printed on a label as third-party testing — only an entry in the certifier's own registry.
Which Inulin (prebiotic fiber) is the top rated?+
We don't republish marketplace star ratings — they belong to the retailer, they move constantly, and a 4.6 average tells you nothing about what is in the capsule. The two things you can verify are what a dose costs and whether an independent lab checked the label. On this page the best value is Now Supplements, Prebiotic Inulin Fiber, 180 Veg Capsules at $0.10 per serving; no brand here holds a certification we could verify in a public registry.
Independent testing
Independent third-party testing is a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
References & sources
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.