BulkSupplements Organic Spirulina Powder, 500 g Review
#7 of 8 · Best Budget✓ Label verified · Supplement Facts read Sep 20, 2026Real retailer photo, cut out. Label unedited.
Consider it. The budget organic powder without the lead warning. Micro Ingredients is two cents cheaper per dose but carries a Prop 65 warning; BulkSupplements does not, which makes it our budget pick.
$24-26~$0.15 per 1-teaspoon (3 g) serving
Why It Scores 8.1 — And The Label Line Behind Each Number
Dose vs Clinical Range
25% of scoreOne teaspoon (about 3 g) is the studied daily amount; 167 teaspoons per bag.
- Disclosed per serving
- 3 g organic spirulina powder
Purity & Contaminant Control
25% of scoreUSDA Organic and no Prop 65 warning, but no third-party testing statement is printed and the growing region is not named.
- Seals
- USDA Organic; gluten free, soy free, dairy free, no added sugar, additive free
Label Transparency
20% of scoreThe panel declares only 3 g organic spirulina powder per serving; protein, minerals and pigments are not disclosed.
Certifications & Sourcing
15% of scoreUSDA Organic seal plus gluten-free, soy-free, dairy-free and additive-free statements on the front.
- Form
- Powder
- Other ingredients
- None; allergens: none
Value
15% of scoreAbout $0.15 per 3 g serving; the second-cheapest dose on the list and the cheapest without a warning.
- Serving
- 1 teaspoon (about 3 g)
- Count
- 500 g, 167 servings
- Cost per dose
- ~$0.15 per 3 g serving
Label verified. Every figure read from the Supplement Facts photo, Sep 20, 2026.
Marketing Claims Vs. Reality
Organic spirulina powder.
USDA Organic seal on the panel.
Additive free, no added sugar.
The panel lists a single ingredient and 'Other ingredients: None'.
167 servings.
500 g at about 3 g per teaspoon is 167 servings, as printed on the front.
What Our Test Actually Found
A clean bag with a quiet panel
Everything on the label is either the algae or an absence: no additives, no allergens, no warning. That is good. What is missing is any positive disclosure, so you cannot count the iron or the protein toward anything.
The safer budget choice
The choice at the bottom of the price range is BulkSupplements at fifteen cents or Micro Ingredients at thirteen with a Prop 65 warning. Two cents a day buys you a label without a lead warning; that is an easy call.
Full analysis: all pros & cons (7), buy if / skip if
- About $0.15 per 3 g dose
- USDA Organic, single ingredient, no allergens
- No Prop 65 warning
- 167 servings per bag
- No protein, iron or phycocyanin disclosure
- No third-party testing statement on the pack
- Growing region not named
- You want a cheap organic 3 g dose without a printed heavy-metal warning
- You buy in bulk and want 167 servings in one bag
- You want a single ingredient and nothing else
- You want protein, iron or phycocyanin on the panel
- You want a named growing region
- You prefer tablets
Micro Ingredients is two cents cheaper per dose but carries a Prop 65 warning; BulkSupplements does not, which makes it our budget pick. You get a full 3 g teaspoon, organic certification and a clean single-ingredient panel. You do not get mineral disclosure or a named farm, so it sits below the US-grown powders.
BulkSupplements does what the name says: 500 g of USDA Organic spirulina powder in a resealable bag, 1 teaspoon (about 3 g) per serving, 167 servings, no other ingredients and no allergens. The front lists gluten-free, soy-free, dairy-free, no added sugar and additive-free. What the panel does not do is disclose protein, iron or phycocyanin, and the pack carries no third-party testing statement.
Buy it when price decides and you still want organic without a warning
This is the sensible floor of the market: a real organic seal, a full 3 g teaspoon and a clean panel for fifteen cents. It cannot compete with the tablets on disclosure or origin, and it does not try.
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 do I measure a serving?
One level teaspoon is about 3 g per the panel. A kitchen scale is more accurate if you want to match the 2-3 g used in trials exactly.
Is BulkSupplements spirulina tested for heavy metals?
The pack prints no testing statement, only the USDA Organic seal. BulkSupplements publishes lot certificates on its website, but that is not on the label, so we scored it as unstated.
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] Roy-Lachapelle A, Solliec M, Bouchard MF, Sauvé S. Toxins (Basel). 2017;9(3):76. PMID 28245621 — Detection of Cyanotoxins in Algae Dietary Supplements. Analysis of eighteen algae dietary supplements detected cyanotoxins in a subset of products, underlining that cultivation control and finished-product testing, not the algae species alone, determine safety.
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.