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All supplements

Fiber, probiotics & enzymes

Other fiber supplements

Fibers like inulin, acacia or glucomannan. Fiber helps keep digestion regular and feeds the good bacteria in your gut.

117 products from US online stores, sorted by what 5 g of fiber costs – not by the price per pack.

5.7¢Lowest cost
per 5 g fiber

  • Prices checked Nov 1, 2026, US
  • No paid placements

What does 5 g mean?

fiber per serving in most of the products we checked
2–7.5 gfiber per serving in most of the products we checked
  • 5 g is about one serving: half of the 117 products we checked have up to 4 g per serving, the other half more.
  • 5 g is less than the 28 g Daily Value for fiber, from food and supplements together (FDA (opens in a new tab)).

We compare by 5 g only so products line up – it’s not a recommendation. Not medical advice.

Where products miss quality points

How the 117 products score

  • Very good 90+: 0
  • Good 75+: 97
  • Fair 60+: 18
  • Low under 60: 2

2 products contain artificial colors with an EU warning – a food authority has banned, restricted or flagged it as a possible health risk. Their score is cut in half, so it’s always in the red range. Each product says why.

have no seal from an independent testing program
100%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 24 whose label says “third-party tested”
hide amounts in a “proprietary blend”
15%hide amounts in a “proprietary blend”5 of 20 transparency points – you only see the total

The full 30 testing points need an independent test. Every supplement sold in the US is made under the FDA’s GMP rules – the maker checks its own products, which gives 10 points. A seal from a testing program like NSF, USP or Informed Choice means a lab outside the company checks that what’s inside matches the label. Most brands don’t take part. That doesn’t make a product bad – without a seal, a clean product still gets up to 80.

We find seals on the label and in NSF’s public lists. USP and Informed Choice don’t let us search their lists automatically, so a seal that’s only in their lists can be missing. How the score works

Pack size

Compare packs of a similar size.

Pack size

All sizes in one list can affect the results – big packs usually cost less per 5 g. Pick a size above to compare packs that are alike.

Sort by

117 products · cheapest per 5 g fiber first

  1. Rank 1

    NuNaturals

    Oat Fiber Powder

    Powder

    80Good qualityCountry not stated
    5.7¢

    per 5 g

    Lowest

    Pack
    $5.19454 g (1 lb)151 servings
    Fiber per serving
    3 gin 3 g
    Pack lasts
    90 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  2. Rank 2

    Nutricost

    Organic Acacia Fiber Powder, Unflavored

    Powder

    85Good qualityPacked in USA
    $0.15

    per 5 g

    160% more

    Pack
    $26.95907 g (2 lb)302 servings
    Fiber per serving
    3 gin 3 g
    Pack lasts
    181 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  3. Rank 3

    Micro Ingredients

    Organic Inulin Powder, Unflavored

    Powder

    85Good qualityCountry not stated
    $0.15

    per 5 g

    162% more

    Pack
    $29.951 kg (2.2 lb)385 servings
    Fiber per serving
    2.6 gin 2.6 g
    Pack lasts
    200 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  4. Rank 4

    Nutricost

    Pantry, Organic Oat Fiber

    Powder

    85Good qualityCountry not stated
    $0.15

    per 5 g

    171% more

    Pack
    $18.95816 g (1.8 lb)204 servings
    Fiber per serving
    3 gin 4 g
    Pack lasts
    122 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  5. Rank 5

    Micro Ingredients

    Unflavored Organic Inulin FOS Powder - 2.2 Pounds

    Powder

    80Good qualityCountry not stated
    $0.17

    per 5 g

    192% more

    Pack
    $33.28998 g (2.2 lb)384 servings
    Fiber per serving
    2.6 gin 2.6 g
    Pack lasts
    199 daysif you take 5 g a day
    microingredients.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  6. Rank 6

    NOW Foods

    Certified Organic Inulin, Prebiotic Pure Powder

    Powder

    80Good qualityCountry not stated
    $0.20

    per 5 g

    247% more

    Pack
    $9.00227 g (8 oz)57 servings
    Fiber per serving
    4 gin 4 g
    Pack lasts
    45 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  7. Rank 7

    NOW Foods

    Certified Organic Acacia Fiber Pure Powder

    Powder

    80Good qualityCountry not stated
    $0.20

    per 5 g

    248% more

    Pack
    $12.49340 g (12 oz)52 servings
    Fiber per serving
    6 gin 6.5 g
    Pack lasts
    62 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  8. Rank 8

    Micro Ingredients

    Organic Inulin Powder, Unflavored

    Powder

    85Good qualityCountry not stated
    $0.21

    per 5 g

    260% more

    Pack
    $20.59500 g (1.1 lb)192 servings
    Fiber per serving
    2.6 gin 2.6 g
    Pack lasts
    100 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  9. Rank 9

    Micro Ingredients

    Organic Acacia Senegal Fiber Powder

    Powder

    80Good qualityCountry not stated
    $0.21

    per 5 g

    261% more

    Pack
    $29.95907 g (2 lb)363 servings
    Fiber per serving
    2 gin 2.5 g
    Pack lasts
    145 daysif you take 5 g a day
    microingredients.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  10. Rank 10

    Micro Ingredients

    Organic Inulin Powder

    Powder

    80Good qualityCountry not stated
    $0.22

    per 5 g

    285% more

    Pack
    $21.95499 g (1.1 lb)192 servings
    Fiber per serving
    2.6 gin 2.6 g
    Pack lasts
    99 daysif you take 5 g a day
    microingredients.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  11. Rank 11

    Best Naturals

    Konjac Root Glucomannan1 Lb Pure Powder

    Powder

    80Good qualityMade in USA
    $0.22

    per 5 g

    285% more

    Pack
    $19.99454 g (1 lb)227 servings
    Fiber per serving
    2 gin 2 g
    Pack lasts
    90 daysif you take 5 g a day
    shopbestnaturals.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  12. Rank 12

    Dr. Murray's

    Prebiotic, Optimized FiberSMART Soluble Tapioca Fiber

    Powder

    80Good qualityCountry not stated
    $0.23

    per 5 g

    296% more

    Pack
    $18.49454 g (1 lb)45 servings
    Fiber per serving
    9 gin 10 g
    Pack lasts
    81 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  13. Rank 13

    NOW Foods

    Prebiotic Fiber with Fibersol -2

    Powder

    80Good qualityPacked in USA
    $0.24

    per 5 g

    312% more

    Pack
    $14.69340 g (12 oz)28 servings
    Fiber per serving
    11 gin 12 g
    Pack lasts
    62 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  14. Rank 14

    Nutricost

    Glucomannan, Unflavored

    Powder

    85Good qualityPacked in USA
    $0.27

    per 5 g

    371% more

    Pack
    $26.95500 g (1.1 lb)250 servings
    Fiber per serving
    2 gin 2 g
    Pack lasts
    100 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  15. Rank 15

    NOW Foods

    Certified Organic Inulin Prebiotic Pure Powder

    Powder

    80Good qualityCountry not stated
    $0.27

    per 5 g

    372% more

    Pack
    $12.2957 servings
    Fiber per serving
    4 g
    Pack lasts
    45 daysif you take 5 g a day
    swansonvitamins.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  16. Rank 16

    Micro Ingredients

    Organic Triple Fiber

    Powder

    65Fair qualityCountry not stated
    $0.27

    per 5 g

    375% more

    Pack
    $36.95907 g (2 lb)113 servings
    Fiber per serving
    6 gin 8 g
    Pack lasts
    136 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  17. Rank 17

    Micro Ingredients

    Organic Triple Fiber Powder

    Powder

    65Fair qualityCountry not stated
    $0.27

    per 5 g

    375% more

    Pack
    $36.95907 g (2 lb)113 servings
    Fiber per serving
    6 gin 8 g
    Pack lasts
    136 daysif you take 5 g a day
    microingredients.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  18. Rank 18

    Sprout Living

    Organic Prebiotic Inulin, Daily Fiber Powder

    Powder

    80Good qualityMade in USA
    $0.27

    per 5 g

    380% more

    Pack
    $19.95454 g (1 lb)182 servings
    Fiber per serving
    2 gin 2.5 g
    Pack lasts
    72 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  19. Rank 19

    Nutricost

    Organic Inulin Powder, Unflavored

    Powder

    85Good qualityMade in USA
    $0.28

    per 5 g

    383% more

    Pack
    $21.95454 g (1 lb)57 servings
    Fiber per serving
    7 gin 8 g
    Pack lasts
    79 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  20. Rank 20

    NOW Foods

    Apple Fiber, Pure Powder

    Powder

    80Good qualityPacked in USA
    $0.28

    per 5 g

    386% more

    Pack
    $9.44340 g (12 oz)34 servings
    Fiber per serving
    5 gin 10 g
    Pack lasts
    34 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  21. Rank 21

    Nutricost

    Organic Inulin Powder

    Powder

    85Good qualityMade in USA
    $0.29

    per 5 g

    413% more

    Pack
    $24.97454 g (1 lb)57 servings
    Fiber per serving
    7.5 gin 8 g
    Pack lasts
    85 daysif you take 5 g a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  22. Rank 22

    KOS

    Organic Inulin Powder

    Powder

    80Good qualityMade in USA
    $0.30

    per 5 g

    420% more

    Pack
    $19.99336 g (11.9 oz)112 servings
    Fiber per serving
    3 gin 3 g
    Pack lasts
    67 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  23. Rank 23

    Nutricost

    Glucomannan Powder

    Powder

    85Good qualityMade in USA
    $0.30

    per 5 g

    425% more

    Pack
    $29.97499 g (1.1 lb)250 servings
    Fiber per serving
    2 gin 2 g
    Pack lasts
    99 daysif you take 5 g a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  24. Rank 24

    Protocol for Life Balance

    Certified Organic Acacia Fiber Pure Powder

    Powder

    80Good qualityCountry not stated
    $0.30

    per 5 g

    430% more

    Pack
    $19.00340 g (12 oz)52 servings
    Fiber per serving
    6 gin 6.5 g
    Pack lasts
    62 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  25. Rank 25

    Nutricost

    Prebiotic Fiber Powder, Unflavored

    Powder · 2 flavors: Fruit Punch, Unflavored

    85Good qualityCountry not stated
    $0.31

    per 5 g

    444% more

    Pack
    $21.97454 g (1 lb)50 servings
    Fiber per serving
    7 gin 9 g
    Pack lasts
    70 daysif you take 5 g a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  26. Rank 26

    Best Naturals

    Konjac Root Glucomannan

    Powder

    80Good qualityPacked in USA
    $0.31

    per 5 g

    446% more

    Pack
    $28.34454 g (1 lb)227 servings
    Fiber per serving
    2 gin 2 g
    Pack lasts
    90 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  27. Rank 27

    Nutricost

    Soluble Fiber, Berry

    Powder

    85Good qualityMade in USA
    $0.34

    per 5 g

    494% more

    Pack
    $18.95372 g (13.1 oz)31 servings
    Fiber per serving
    9 gin 12 g
    Pack lasts
    55 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  28. Rank 28

    Nutricology

    Dietary Fiber Cellulose

    Powder

    80Good qualityCountry not stated
    $0.35

    per 5 g

    512% more

    Pack
    $17.49250 g (8.8 oz)125 servings
    Fiber per serving
    2 gin 2 g
    Pack lasts
    50 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  29. Rank 29

    Swanson Vitamins

    Inulin - Prebiotic Soluble Fiber

    Powder

    80Good qualityCountry not stated
    $0.35

    per 5 g

    520% more

    Pack
    $16.09227 g (8 oz)45 servings
    Fiber per serving
    5 gin 5 g
    Pack lasts
    45 daysif you take 5 g a day
    swansonvitamins.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  30. Rank 30

    Yerba Prima

    Soluble Fiber Formula

    Powder

    65Fair qualityMade in USA
    $0.41

    per 5 g

    623% more

    Pack
    $20.99340 g (12 oz)48 servings
    Fiber per serving
    5.3 gin 7.1 g
    Pack lasts
    50 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  31. Rank 31

    MRM Nutrition

    Whole Food Organic Fiber

    Powder

    80Good qualityCountry not stated
    $0.41

    per 5 g

    624% more

    Pack
    $15.89256 g (9 oz)32 servings
    Fiber per serving
    6 gin 8 g
    Pack lasts
    38 daysif you take 5 g a day
    mrmnutrition.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  32. Rank 32

    Yerba Prima

    Prebiotic Colon Care Formula

    Powder

    65Fair qualityMade in USA
    $0.42

    per 5 g

    630% more

    Pack
    $19.99340 g (12 oz)48 servings
    Fiber per serving
    5 gin 7.1 g
    Pack lasts
    47 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  33. Rank 33

    Nature's Answer

    Liquid Fiber, Natural Lemon-Lime

    Liquid

    65Fair qualityMade in USA
    $0.42

    per 5 g

    642% more

    Pack
    $18.74473.2 ml (16 fl oz)16 servings
    Fiber per serving
    14 gin 30 ml
    Pack lasts
    44 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  34. Rank 34

    Solaray

    Daily Triple Fiber Powder, Unflavored

    Powder

    80Good qualityCountry not stated
    $0.43

    per 5 g

    647% more

    Pack
    $28.99401 g (14.1 oz)31 servings
    Fiber per serving
    11 gin 13 g
    Pack lasts
    67 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  35. Rank 35

    Organic Traditions

    Superfoods, Fiber Smoothie, Berry

    Powder

    80Good qualityCountry not stated
    $0.44

    per 5 g

    672% more

    Pack
    $11.92300 g (10.6 oz)15 servings
    Fiber per serving
    9 gin 20 g
    Pack lasts
    27 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  36. Rank 36

    Swanson Vitamins

    Inulin, Prebiotic Soluble Fiber

    Powder

    80Good qualityCountry not stated
    $0.44

    per 5 g

    675% more

    Pack
    $16.09227 g (8 oz)45 servings
    Fiber per serving
    4 gin 5 g
    Pack lasts
    36 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  37. Rank 37

    Metamucil

    4-in-1 Fiber, Unflavored

    Powder

    80Good qualityCountry not stated
    $0.46

    per 5 g

    705% more

    Pack
    $31.49798 g (1.8 lb)57 servings
    Fiber per serving
    6 gin 14 g
    Pack lasts
    68 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  38. Rank 38

    ProCare Health

    FiberCel - Powdered Fiber - Packets

    Powder

    80Good qualityCountry not stated
    $0.46

    per 5 g

    711% more

    Pack
    $12.99157 g (5.5 oz)28 servings
    Fiber per serving
    5 gin 5.6 g
    Pack lasts
    28 daysif you take 5 g a day
    procarenow.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  39. Rank 39

    Garden of Life

    Dr. Formulated, Organic Fiber, Unflavored

    Powder

    70Fair qualityMade in USA
    $0.50

    per 5 g

    780% more

    Pack
    $16.09192 g (6.8 oz)32 servings
    Fiber per serving
    5 gin 6 g
    Pack lasts
    32 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  40. Rank 40

    Garden of Life

    Dr. Formulated Organic Fiber, Citrus

    Powder

    80Good qualityMade in USA
    $0.51

    per 5 g

    784% more

    Pack
    $16.09223 g (7.9 oz)32 servings
    Fiber per serving
    5 gin 7 g
    Pack lasts
    31 daysif you take 5 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

40 of 117 shown

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Good to know

Fact
13,809%more per 5 g for the most expensive product than for the cheapest.
Fact
827%more per 5 g for the cheapest capsules than for the cheapest powder.

How we checked: one-time price for each size in the store’s US online shop, before sales tax and shipping, without subscriptions or coupons. Prices change often, so check the store before you buy. More on how we check

The amount we compare by only makes products comparable – it is not a dosage recommendation. Not medical advice.

How we calculate

Cost per dose = price ÷ (servings × amount per serving) × comparison amount. Example: $119.99 for 74 servings with 24 g of protein each is 1,776 g of protein. $119.99 ÷ 1,776 g × 30 g = $2.03 per 30 g of protein.

Found a mistake or a product we should add? Email us