NOW Certified Organic Spirulina 1,000 mg Double Strength Tablets Review
#4 of 8 · Best Organic Tablet✓ Label verified · Supplement Facts read Sep 20, 2026Real retailer photo, cut out. Label unedited.
Buy it for organic certification and a clean tablet at a low price. Nothing on this list is cleaner: one ingredient, no binders, USDA Organic via QAI, Non-GMO Project verified, GMP.
$13-14~$0.11 per 1,000 mg tablet
Why It Scores 8.4 — And The Label Line Behind Each Number
Dose vs Clinical Range
25% of scoreOne 1,000 mg tablet is the printed serving; three tablets reach the 3 g the trials used.
- Disclosed per serving
- 1 g organic spirulina, protein under 1 g
Purity & Contaminant Control
25% of scoreGMP Quality Assured seal and NOW's own analytical laboratories; organic certification limits pesticide exposure, though the growing site is not named on the pack.
- Seals
- USDA Organic (QAI), Non-GMO Project Verified, GMP Quality Assured
Label Transparency
20% of scoreThe panel declares 1,000 mg organic spirulina and under 1 g protein, with 'Other ingredients: None'; no iron or phycocyanin figures.
Certifications & Sourcing
15% of scoreUSDA Organic (QAI), Non-GMO Project Verified and GMP Quality Assured seals all on the panel.
- Form
- Tablet, 1,000 mg each
- Other ingredients
- None
Value
15% of scoreAbout $0.11 per 1,000 mg tablet, roughly $0.34 for three; one of the cheapest organic routes to a full dose.
- Serving
- 1 tablet (1,000 mg)
- Count
- 120 tablets (120 servings)
- Cost per dose
- ~$0.11 per tablet
Label verified. Every figure read from the Supplement Facts photo, Sep 20, 2026.
Marketing Claims Vs. Reality
Certified organic spirulina.
USDA Organic seal on the panel, certified by QAI (US-ORG-050).
Double strength.
1,000 mg per tablet is double the 500 mg tablets that dominate the category; the claim is about tablet size, not about potency per gram.
No other ingredients.
The panel reads 'Other ingredients: None', which none of the excipient-bound tablets can match.
What Our Test Actually Found
The cleanest tablet in the group
Nutrex and Earthrise need silica and stearates to bind their tablets. NOW's 1,000 mg tablet lists no other ingredients at all, and it is certified organic. For purists that combination is hard to beat.
One tablet is not a trial dose
The printed serving is one tablet, or 1,000 mg. The human trials that showed symptom and lipid changes used 2-3 g a day and more, so the practical serving is three tablets, and the 120-count bottle then lasts forty days.
Full analysis: all pros & cons (7), buy if / skip if
- USDA Organic via QAI, Non-GMO Project verified
- No excipients at all
- GMP manufacturing with in-house labs
- Cheap: about $0.11 per 1,000 mg tablet
- Printed serving is one tablet, a third of the studied dose
- No iron or phycocyanin disclosure
- Growing region not named on the pack
- You want USDA Organic and a tablet, not a powder
- You want zero excipients
- You value a manufacturer with in-house labs and GMP
- You want the full trial dose in a single printed serving
- You want iron or phycocyanin numbers on the panel
- You want to know which farm the algae came from
Nothing on this list is cleaner: one ingredient, no binders, USDA Organic via QAI, Non-GMO Project verified, GMP. NOW also runs its own testing labs, which is more than most brands here can say. The 1,000 mg tablet is 'double strength' versus 500 mg tablets, but a one-tablet serving is still a third of the studied dose, so plan on three a day.
NOW's double-strength spirulina is a single-ingredient tablet: 1,000 mg certified-organic spirulina, 'Other ingredients: None', 120 tablets. The organic certification is by QAI, the Non-GMO Project seal is on the panel and NOW manufactures under GMP with its own analytical labs. The only thing to know is the serving: the label says one tablet, so reaching the 3 g used in trials means three.
The organic tablet that earns its spot on cleanliness and price
If you want organic certification in a tablet, NOW is the pick: no binders, real seals, a testing-lab manufacturer and a low price. Take three to match the trials and it still costs about a third of a dollar a day.
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.
03Anthony's California 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.
Quick Answers
How many NOW spirulina tablets equal the trial dose?
Three. Each tablet is 1,000 mg; the six-month allergic-rhinitis trial used 2 g a day and the lipid meta-analyses pooled doses from 1 to 8 g, so three tablets (3 g) sits comfortably inside that range.
Where is NOW spirulina grown?
The pack does not name a farm or country. It is certified organic by QAI and manufactured under GMP in the USA; if a named growing site matters to you, Nutrex (Hawaii) or Earthrise (California) print theirs.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Huang H, Liao D, Pu R, Cui Y. Diabetes Metab Syndr Obes. 2018;11:729-742. PMID 30532573 — Quantifying the effects of spirulina supplementation on plasma lipid and glucose concentrations, body weight, and blood pressure. A meta-analysis of randomized trials found spirulina reduced total cholesterol, LDL, triglycerides, fasting glucose and diastolic blood pressure, with the largest lipid effects at higher doses and longer durations.
- [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.
Affiliate disclosure: every Amazon link uses our Associates tag (superachieverclub-20). We earn a small commission at no cost to you; it funds independent reviews. We never accept payment to change a ranking.