Anthony's California Spirulina Powder, 8 oz Review
#3 of 8 · Best US-Grown Powder✓ Label verified · Supplement Facts read Sep 20, 2026Real retailer photo, cut out. Label unedited.
Buy it. The US-grown powder to buy if organic is not your deal-breaker. A teaspoon is a full 3 g trial dose, the panel discloses more minerals than any powder here, and the algae is grown in California rather than an unnamed farm.
$19-20~$0.26 per 1-teaspoon (3 g) serving
Why It Scores 8.5 — And The Label Line Behind Each Number
Dose vs Clinical Range
25% of scoreOne teaspoon (3 g) is the studied daily dose; the 8 oz bag holds 75 of them.
- Disclosed per serving
- 2 g protein, 2.4 mg iron, 9 mg calcium, 45 mg potassium, 20 mg sodium
Purity & Contaminant Control
25% of scoreCalifornia cultivation and batch testing for gluten, but no heavy-metal or microcystin testing claim printed; no Prop 65 warning.
- Seals
- Gluten free (batch tested), Non-GMO, vegan friendly, Product of USA
Label Transparency
20% of scoreNutrition Facts panel declares 2 g protein, 2.4 mg iron, 9 mg calcium, 45 mg potassium and 20 mg sodium per teaspoon.
Certifications & Sourcing
15% of scoreGluten Free (batch tested), Non-GMO, Vegan Friendly and Product of USA on the pack; no organic seal.
- Form
- Powder
- Other ingredients
- None
Value
15% of scoreAbout $0.26 per 3 g serving: the cheapest US-grown dose on the list.
- Serving
- 1 teaspoon (3 g)
- Count
- 8 oz (226 g), 75 servings
- Cost per dose
- ~$0.26 per 3 g serving
Label verified. Every figure read from the Supplement Facts photo, Sep 20, 2026.
Marketing Claims Vs. Reality
California spirulina.
The front panel reads 'California Spirulina Powder' and 'Product of USA'.
Batch tested gluten free.
The pack states gluten-free batch testing; it is the only purity test explicitly claimed on the label.
Organic.
No organic seal appears on the panel. Anthony's sells this as a conventional, non-organic California powder.
What Our Test Actually Found
A food label, not a supplement label, and that is a plus
Anthony's prints a Nutrition Facts panel with iron, calcium, potassium and sodium per teaspoon. That is more mineral disclosure than any organic powder here, and it lets you count the iron toward your day.
US-grown without the US-grown price
Nutrex and Earthrise charge fifty to sixty-five cents per dose for named-farm spirulina. Anthony's California powder costs about a quarter. You give up organic certification and tablets, not origin.
Full analysis: all pros & cons (7), buy if / skip if
- California-grown, Product of USA
- Full 3 g teaspoon dose for about $0.26
- Iron, calcium, potassium and sodium disclosed
- No excipients; single ingredient
- Not organic certified
- No heavy-metal or microcystin testing claim on the pack
- Plain powder taste; needs a smoothie
- You want a US-grown powder rather than an import
- You want per-serving minerals on the label
- You want a full 3 g dose for around a quarter
- USDA Organic is a requirement for you
- You dislike the taste of plain spirulina in water
- You want a printed third-party heavy-metal testing claim
A teaspoon is a full 3 g trial dose, the panel discloses more minerals than any powder here, and the algae is grown in California rather than an unnamed farm. It misses USDA Organic, which is why it trails the two tablets, but it beats every organic powder on disclosure and matches them on origin certainty.
Anthony's sells its spirulina as a food, and the label follows: a Nutrition Facts panel with 3 g spirulina, 2 g protein, 2.4 mg iron, 9 mg calcium, 45 mg potassium and 20 mg sodium per teaspoon, 75 servings per 8 oz bag. It is California-grown, batch-tested gluten-free and Non-GMO, but not organic-certified. For a US-grown powder at roughly $0.26 per dose, that is a strong trade.
The value pick among US-grown spirulina
If you want to know where your algae grew and do not need an organic seal, this is the cheapest way to a disclosed, 3 g, US-grown dose. It ranks above the organic powders because origin and mineral disclosure beat a seal on a bare panel.
If This Doesn’t Fit — Try These
01Nutrex Hawaiian Spirulina
It costs more than a bag of powder and it is not organic, but everything the science asks for is on the panel: 3 g per serving, a named controlled pond, third-party testing and disclosed iron and protein.
02Earthrise California Spirulina
If you take spirulina for its phycocyanin, Earthrise is the only brand that tells you how much you are getting.
04NOW Organic Spirulina 1,000 mg
If you want organic certification in a tablet, NOW is the pick: no binders, real seals, a testing-lab manufacturer and a low price.
Quick Answers
Is Anthony's spirulina organic?
No. It is California-grown, Non-GMO and batch-tested gluten-free, but not certified organic. Micro Ingredients, BulkSupplements, Vimergy and NOW are the organic options on the list.
How much is a serving?
One teaspoon, 3 g, which is the daily amount used in the allergic-rhinitis trial and within the range pooled in the lipid meta-analyses. The 8 oz bag holds about 75 servings.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Serban MC, et al. Clin Nutr. 2016;35(4):842-51. PMID 26433766 — A systematic review and meta-analysis of the impact of Spirulina supplementation on plasma lipid concentrations. Pooling seven randomized trials, spirulina supplementation lowered total cholesterol, LDL and triglycerides and raised HDL, with doses across the trials ranging from about 1 to 8 g a day.
- [2] Cingi C, et al. Eur Arch Otorhinolaryngol. 2008;265(10):1219-23. PMID 18343939 — The effects of spirulina on allergic rhinitis. In a six-month double-blind, placebo-controlled trial, 2 g of spirulina a day significantly reduced allergic-rhinitis symptoms including nasal discharge, sneezing, congestion and itching versus placebo.
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