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Whole-food powders & natural products

Spirulina

A blue-green alga, dried and powdered. It adds protein, iron and plant pigments – studies on other effects are small.

42 products from US online stores, sorted by what 3 g of spirulina costs – not by the price per pack.

9.9¢Lowest cost
per 3 g spirulina

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

What does 3 g mean?

spirulina per serving in most of the products we checked
0.5–3.3 gspirulina per serving in most of the products we checked
  • 3 g is a fixed amount to compare by: half of the 42 products we checked have up to 1.5 g per serving, the other half more.
  • There’s no official daily amount for spirulina.

We compare by 3 g only so products line up – it’s not a recommendation. Not medical advice.

Where products miss quality points

How the 42 products score

  • Very good 90+: 3
  • Good 75+: 39
  • Fair 60+: 0
  • Low under 60: 0
have no seal from an independent testing program
93%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 8 whose label says “third-party tested”

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 3 g. Pick a size above to compare packs that are alike.

Sort by

42 products · cheapest per 3 g spirulina first

  1. Rank 1

    Nutricost

    Organic Spirulina, Unflavored

    Powder

    85Good qualityPacked in USA
    9.9¢

    per 3 g

    Lowest

    Pack
    $29.95907 g (2 lb)907 servings
    Spirulina per serving
    1 gin 1 g
    Pack lasts
    302 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  2. Rank 2

    Nutricost

    Organic Spirulina Powder

    Powder

    85Good qualityMade in USA
    $0.11

    per 3 g

    10% more

    Pack
    $32.97907 g (2 lb)907 servings
    Spirulina per serving
    1 gin 1 g
    Pack lasts
    302 daysif you take 3 g a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  3. Rank 3

    Nutricost

    Organic Spirulina, Unflavored

    Powder

    85Good qualityPacked in USA
    $0.13

    per 3 g

    33% more

    Pack
    $19.95454 g (1 lb)454 servings
    Spirulina per serving
    1 gin 1 g
    Pack lasts
    151 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  4. Rank 4

    Micro Ingredients

    Organic Spirulina Powder

    Powder

    85Good qualityCountry not stated
    $0.15

    per 3 g

    46% more

    Pack
    $21.95454 g (1 lb)151 servings
    Spirulina per serving
    3 gin 3 g
    Pack lasts
    151 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  5. Rank 5

    Nutricost

    Organic Spirulina Powder

    Powder

    85Good qualityMade in USA
    $0.15

    per 3 g

    47% more

    Pack
    $21.97454 g (1 lb)454 servings
    Spirulina per serving
    1 gin 1 g
    Pack lasts
    151 daysif you take 3 g a day
    nutricost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  6. Rank 6

    Vitacost

    Root2, Spirulina Superfood

    Powder

    80Good qualityCountry not stated
    $0.16

    per 3 g

    61% more

    Pack
    $24.19454 g (1 lb)151 servings
    Spirulina per serving
    3 gin 3 g
    Pack lasts
    151 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  7. Rank 7

    Amazing Nutrition

    Amazing Formulas Spirulina - 400 Grams Powder

    Powder

    80Good qualityMade in USA
    $0.16

    per 3 g

    66% more

    Pack
    $21.99400 g (14.1 oz)50 servings
    Spirulina per serving
    8 gin 8 g
    Pack lasts
    133 daysif you take 3 g a day
    amazingnutrition.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  8. Rank 8

    KOS

    Organic Spirulina Powder

    Powder

    80Good qualityPacked in USA
    $0.19

    per 3 g

    91% more

    Pack
    $23.99381 g (13.4 oz)109 servings
    Spirulina per serving
    3.5 gin 3.5 g
    Pack lasts
    127 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  9. Rank 9

    NOW Foods

    Certified Organic Spirulina Powder

    Powder

    80Good qualityCountry not stated
    $0.20

    per 3 g

    102% more

    Pack
    $30.32454 g (1 lb)138 servings
    Spirulina per serving
    3.3 gin 3.3 g
    Pack lasts
    151 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  10. Rank 10

    Micro Ingredients

    Organic Spirulina

    Tablets

    85Good qualityCountry not stated
    $0.22

    per 3 g

    118% more

    Pack
    $25.95720 tablets120 servings
    Spirulina per serving
    3 gin 6 tablets
    Pack lasts
    120 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  11. Rank 11

    Frontier Co-op

    Organic Spirulina Powder

    Powder

    80Good qualityCountry not stated
    $0.22

    per 3 g

    119% more

    Pack
    $32.71453 g (1 lb)266 servings
    Spirulina per serving
    1.7 gin 1.7 g
    Pack lasts
    151 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  12. Rank 12

    Starwest Botanicals

    Organic Spirulina Powder

    Powder

    80Good qualityCountry not stated
    $0.24

    per 3 g

    140% more

    Pack
    $35.90454 g (1 lb)454 servings
    Spirulina per serving
    1 gin 1 g
    Pack lasts
    151 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  13. Rank 13

    NOW Foods

    Certified Organic Spirulina Powder

    Powder

    80Good qualityPacked in USA
    $0.24

    per 3 g

    146% more

    Pack
    $9.17113 g (4 oz)34 servings
    Spirulina per serving
    3.3 gin 3.3 g
    Pack lasts
    37 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  14. Rank 14

    Micro Ingredients

    Organic Spirulina Tablets 720 Counts

    Tablets

    80Good qualityMade in USA
    $0.25

    per 3 g

    152% more

    Pack
    $29.95720 tablets120 servings
    Spirulina per serving
    3 gin 6 tablets
    Pack lasts
    120 daysif you take 6 tablets (3 g) a day
    microingredients.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  15. Rank 15

    MRM Nutrition

    Spirulina Powder

    Powder

    80Good qualityCountry not stated
    $0.25

    per 3 g

    152% more

    Pack
    $19.99240 g (8.5 oz)40 servings
    Spirulina per serving
    6 gin 6 g
    Pack lasts
    80 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  16. Rank 16

    California Gold Nutrition

    Organic Spirulina

    Tablets

    100Very good qualityCountry not stated
    $0.26

    per 3 g

    159% more

    Pack
    $30.73720 tablets240 servings
    Spirulina per serving
    1.5 gin 3 tablets
    Pack lasts
    120 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  17. Rank 17

    NOW Foods

    Certified Organic Spirulina, 500 mg

    Tablets

    80Good qualityPacked in USA
    $0.26

    per 3 g

    165% more

    Pack
    $21.87500 tablets250 servings
    Spirulina per serving
    1 gin 2 tablets
    Pack lasts
    83 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  18. Rank 18

    Swanson Vitamins

    Spirulina

    Tablets

    80Good qualityCountry not stated
    $0.27

    per 3 g

    176% more

    Pack
    $8.19180 tablets
    Spirulina per serving
    0.5 gin 1 tablet
    Pack lasts
    30 daysif you take 6 tablets (3 g) a day
    swansonvitamins.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  19. Rank 19

    NOW Foods

    Certified Organic Spirulina, 1,000 mg

    Tablets

    80Good qualityPacked in USA
    $0.27

    per 3 g

    176% more

    Pack
    $21.87240 tablets
    Spirulina per serving
    1 gin 1 tablet
    Pack lasts
    80 daysif you take 3 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  20. Rank 20

    Swanson Vitamins

    Spirulina, 500 mg

    Tablets

    80Good qualityCountry not stated
    $0.28

    per 3 g

    184% more

    Pack
    $8.44180 tablets
    Spirulina per serving
    0.5 gin 1 tablet
    Pack lasts
    30 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  21. Rank 21

    Nutrex Hawaii

    Pure Hawaiian Spirulina Powder

    Powder

    80Good qualityCountry not stated
    $0.31

    per 3 g

    214% more

    Pack
    $27.99270 g (9.5 oz)90 servings
    Spirulina per serving
    3 gin 3 g
    Pack lasts
    90 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  22. Rank 22

    California Gold Nutrition

    Organic Spirulina

    Tablets

    100Very good qualityCountry not stated
    $0.32

    per 3 g

    218% more

    Pack
    $12.60240 tablets80 servings
    Spirulina per serving
    1.5 gin 3 tablets
    Pack lasts
    40 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  23. Rank 23

    Nutricost

    Organic Spirulina, 500 mg

    Tablets

    85Good qualityPacked in USA
    $0.32

    per 3 g

    227% more

    Pack
    $12.95240 tablets
    Spirulina per serving
    0.5 gin 1 tablet
    Pack lasts
    40 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  24. Rank 24

    NOW Foods

    Spirulina, 1,000 mg

    Tablets

    80Good qualityPacked in USA
    $0.34

    per 3 g

    240% more

    Pack
    $13.46120 tablets
    Spirulina per serving
    1 gin 1 tablet
    Pack lasts
    40 daysif you take 3 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  25. Rank 25

    BareOrganics

    Organic Spirulina Powder

    Powder

    80Good qualityMade in USA
    $0.36

    per 3 g

    260% more

    Pack
    $26.99227 g (8 oz)91 servings
    Spirulina per serving
    2.5 gin 2.5 g
    Pack lasts
    75 daysif you take 3 g a day
    bareorganics.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  26. Rank 26

    NOW Foods

    Certified Organic Spirulina, 500 mg

    Tablets

    80Good qualityPacked in USA
    $0.36

    per 3 g

    267% more

    Pack
    $12.11200 tablets100 servings
    Spirulina per serving
    1 gin 2 tablets
    Pack lasts
    33 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  27. Rank 27

    Source Naturals

    Spirulina

    Tablets

    80Good qualityCountry not stated
    $0.39

    per 3 g

    292% more

    Pack
    $32.39500 tablets83 servings
    Spirulina per serving
    3 gin 6 tablets
    Pack lasts
    83 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  28. Rank 28

    HealthForce Superfoods

    Spirulina Manna

    Powder

    80Good qualityMade in USA
    $0.40

    per 3 g

    300% more

    Pack
    $59.95454 g (1 lb)168 servings
    Spirulina per serving
    2.7 gin 2.7 g
    Pack lasts
    151 daysif you take 3 g a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  29. Rank 29

    Vitacost

    Root2, Spirulina Algae

    Tablets

    80Good qualityCountry not stated
    $0.40

    per 3 g

    307% more

    Pack
    $24.19360 tablets180 servings
    Spirulina per serving
    1 gin 2 tablets
    Pack lasts
    60 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  30. Rank 30

    NOW Foods

    Certified Organic Spirulina, 500 mg

    Tablets

    80Good qualityPacked in USA
    $0.40

    per 3 g

    307% more

    Pack
    $6.72100 tablets50 servings
    Spirulina per serving
    1 gin 2 tablets
    Pack lasts
    16 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  31. Rank 31

    Nature's Answer

    Spirulina - Veggie Capsules

    Capsules

    80Good qualityMade in USA
    $0.42

    per 3 g

    320% more

    Pack
    $4.9990 capsules45 servings
    Spirulina per serving
    0.8 gin 2 capsules
    Pack lasts
    11 daysif you take 8 capsules (3.2 g) a day
    naturesanswer.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  32. Rank 32

    Source Naturals

    Spirulina

    Tablets

    80Good qualityCountry not stated
    $0.42

    per 3 g

    326% more

    Pack
    $14.07200 tablets33 servings
    Spirulina per serving
    3 gin 6 tablets
    Pack lasts
    33 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  33. Rank 33

    Swanson Vitamins

    100% Organic Spirulina

    Tablets

    80Good qualityMade in India
    $0.44

    per 3 g

    347% more

    Pack
    $13.29180 tablets90 servings
    Spirulina per serving
    1 gin 2 tablets
    Pack lasts
    30 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  34. Rank 34

    Nutricost

    Spirulina

    Capsules

    85Good qualityMade in USA
    $0.52

    per 3 g

    428% more

    Pack
    $15.70180 capsules30 servings
    Spirulina per serving
    3 gin 6 capsules
    Pack lasts
    30 daysif you take 6 capsules (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  35. Rank 35

    Nutrex Hawaii

    Pure Hawaiian Spirulina

    Tablets

    80Good qualityMade in USA
    $0.52

    per 3 g

    430% more

    Pack
    $31.49180 tablets60 servings
    Spirulina per serving
    3 gin 3 tablets
    Pack lasts
    60 daysif you take 3 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  36. Rank 36

    NOW Foods

    Spirulina

    Capsules

    80Good qualityMade in USA
    $0.61

    per 3 g

    518% more

    Pack
    $12.24120 capsules20 servings
    Spirulina per serving
    3 gin 6 capsules
    Pack lasts
    20 daysif you take 6 capsules (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  37. Rank 37

    Nutrex Hawaii

    Pure Hawaiian Spirulina, 500 mg

    Tablets

    80Good qualityMade in USA
    $0.61

    per 3 g

    520% more

    Pack
    $20.46200 tablets33 servings
    Spirulina per serving
    3 gin 6 tablets
    Pack lasts
    33 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  38. Rank 38

    California Gold Nutrition

    Organic Spirulina

    Tablets

    100Very good qualityCountry not stated
    $0.68

    per 3 g

    585% more

    Pack
    $6.7960 tablets20 servings
    Spirulina per serving
    1.5 gin 3 tablets
    Pack lasts
    10 daysif you take 6 tablets (3 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  39. Rank 39

    Solaray

    True Herbs, Spirulina

    Capsules

    80Good qualityCountry not stated
    $1.01

    per 3 g

    919% more

    Pack
    $13.79100 capsules
    Spirulina per serving
    0.41 gin 1 capsule
    Pack lasts
    12 daysif you take 8 capsules (3.28 g) a day
    vitacost.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

  40. Rank 40

    Nature's Way

    Spirulina Micro-Algae

    Capsules

    80Good qualityPacked in USA
    $1.30

    per 3 g

    1,214% more

    Pack
    $16.49100 capsules50 servings
    Spirulina per serving
    0.76 gin 2 capsules
    Pack lasts
    12 daysif you take 8 capsules (3.04 g) a day
    naturesway.com (opens in a new tab)

    Checked Nov 1, 2026 · Label

40 of 42 shown

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Good to know

Fact
8,295%more per 3 g for the most expensive product than for the cheapest.
Fact
8,295%more per 3 g for the cheapest gummies 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