Spirulina / chlorella
Full ranking Dose tool Products (613)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Reference upper value (cited, not a UL): 8,000 mg
Median (Per day)500 mgP5 20 – P95 3,000
Products613
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=spirulin2&lang=eng · Health Canada NNHPD monograph: adults max 8 g spirulina/day
Daily dose across products (mg/day)
Reference upper value (cited, not a UL) 8,000
8.3 mglog scale · n=6139,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Common questions
Is there an official upper limit for Spirulina / chlorella?
No UL has been set. We use a cited reference upper value of 8,000 mg per day. It comes from the linked study or assessment and is not a regulatory limit. [source]
How much Spirulina / chlorella do products usually contain per day?
As of 2026-11-01, 613 products list a comparable daily dose (861 dose records; one product can have several). The median is 500 mg per day, and 90% of records fall between 20 and 3,000 mg. Figures come from labels and are not lab-tested. [source]
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Nature's Sunshine | Spirulina | 2,400 mg | 100.0 |
| 2 | 21st Century | Organic Spirulina Arthrospira Plantensis | 450 mg | 94.4 |
| 2 | Onnit | Spirulina + Chlorella | 2,000 mg | 94.4 |
| 4 | Prairie Naturals Health Products Inc. | Chlorella Tablets | 500 mg | 93.3 |
| 5 | Healths Harmony | California Spirulina | 1,000 mg | 83.3 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.