Best Spirulina

The best spirulina we track, ranked by real cost-per-dose — not paid placements. Across 29 tracked options the typical dose runs $0.10 per serving.

Prices checked Jun 23, 2026

Best valueCarlyle Organic Spirulina Tablets | 3500mg | 500 Count | Vegetarian

$0.03 per serving — the cheapest spirulina dose we track.

$14.99

$0.03/serving

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Full ranking by cost per dose

Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly. Top 20 of 29 shown.

#	Product	Form · dose	Servings	Price	$ / serving	$ / 3,000 mg
1	Carlyle Organic Spirulina Tablets \| 3500mg \| 500 Count…	tablet · 3500mg	500	$14.99	$0.03	$0.03
2	Probase Nutrition Organic Spirulina Supplement	tablet · 3000mg	720	$25.99	$0.04	$0.04
3	Now Foods, Spirulina, 500 mg, 500 Tabs	tablet · 500mg	500	$24.55	$0.05	$0.29
4	On Target Living Organic Spirulina Chlorella…	tablet · 250g	1000	$49.99	$0.05	—
5	Nutricost, Spirulina Tablets Organic, 500 Mg, 240 Count	tablet · 500mg	240	$12.95	$0.05	$0.32
6	Now Foods, Spirulina, 500 mg, 200 Tabs	tablet · 500mg	200	$11.62	$0.06	$0.35
7	Source Naturals, Spirulina, 500 MG, 500 Tabs	tablet · 500mg	500	$32.19	$0.06	$0.39
8	Now Foods, Spirulina, 500 mg, 100 Tabs	tablet · 500mg	100	$6.45	$0.06	$0.39
9	Source Naturals, Spirulina, 500 MG, 200 Tabs	tablet · 500mg	200	$13.99	$0.07	$0.42
10	Nutrex Hawaii Pure Hawaiian Spirulina – Vegan Superfood	tablet · 500mg	400	$30.99	$0.08	$0.46
11	Nutricost, Organic Spirulina Capsules MWO, 3000 Mg, 180…	capsule · 3000mg	180	$14.95	$0.08	$0.08
12	Nutrex Hawaii, Pure Hawaiian Spirulina, 500 MG, 200 Tabs	tablet · 500mg	200	$17.99	$0.09	$0.54
13	World Organics, Spirulina, 500 Mg, 100 caps	capsule · 500mg	100	$9.43	$0.09	$0.57
14	Nutricost Organic Spirulina + Chlorella (3	tablet · 3000mg	180	$17.95	$0.10	$0.10
15	Now Foods, Spirulina Double Strength Organic, 1000 Mg…	tablet · 1000mg	240	$24.55	$0.10	$0.31
16	NOW Foods Supplements, Certified Organic, Spirulina 1000…	tablet · 1000mg	120	$12.70	$0.11	$0.32
17	Now Foods, Natural Spirulina, 500 mg, 120 Vcaps	capsule · 500mg	120	$12.91	$0.11	$0.65
18	Nutricost, Organic Spirulina Plus Chlorella, 1500 Mg…	tablet · 1500mg	180	$19.95	$0.11	$0.22
19	Now Foods, Organic Spirulina, 1000 mg, 120 Tabs	tablet · 1000mg	120	$14.21	$0.12	$0.36
20	Nature's Answer, Spirulina, 800 Mg, 90 Veg Caps	capsule · 800mg	90	$11.24	$0.12	$0.47

Frequently asked

What is the best-value Spirulina supplement?+

Carlyle Organic Spirulina Tablets | 3500mg | 500 Count | Vegetarian — $0.03 per serving ($14.99 for 500 servings), the lowest cost-per-dose spirulina in our Amazon US catalog as of June 2026.

What is the typical cost per dose for Spirulina?+

About $0.10 per serving across 29 tracked spirulina products, ranging from $0.06 for the best deals to $0.14 for premium options.

What's the cheapest effective Spirulina?+

To reach the commonly-studied 3,000 mg/day dose, Carlyle Organic Spirulina Tablets | 3500mg | 500 Count | Vegetarian is the best value at $0.03 per day — cheaper than bottles that look low-priced per serving but are underdosed.