Source Naturals Spirulina Powder, 16 oz supplement bottle
Source Naturals

Spirulina Powder, 16 oz

What We Researched
20 active ingredients analyzed · 1 brand certification checked · 2 retailers compared · Last updated: Mar 2026
63
Product Score Fair
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Total Carbohydrates 1 g <1%
Spirulina (Arthrospira platensis) Yielding approximately 9 g *
Vitamin A (as Beta Carotene) 18000 IU 360%
Vitamin K 50 mcg 63%
Vitamin B12 8 mcg 133%
Calcium 20 mg 2%
Iron 4 mg 22%
Potassium 120 mg 3%
Phycocyanin 900 mg *
Gamma Linolenic Acid (GLA) 90 mg *
Linoleic Acid 81 mg *
Chlorophyll 81 mg *
Carotenoid 33 mg *
Bioavailability Very Good

Absorption Rating

  • Total Carbohydrates Fair
  • Spirulina (Arthrospira platensis) Yielding approximately Good
  • Vitamin A (as Beta Carotene) Fair
  • Vitamin K Good
  • Vitamin B12 Fair
  • Calcium Good
  • Iron Fair
  • Potassium Good
  • Phycocyanin Good
  • Gamma Linolenic Acid (GLA) Fair
  • Linoleic Acid Good
  • Chlorophyll Fair
  • Carotenoid Good
Other Ingredients Fair

Fillers & Additives

No inactive ingredient data available.

Efficacy Poor

Dosage Analysis

  • Spirulina (Arthrospira platensis) Yielding approximately 9 g High
  • Vitamin A (as Beta Carotene) 18000 IU Under-dosed
  • Vitamin K 50 mcg Under-dosed
  • Vitamin B12 8 mcg Effective
  • Calcium 20 mg Under-dosed
  • Iron 4 mg Under-dosed
  • Potassium 120 mg Under-dosed
  • Phycocyanin 900 mg Effective
  • Gamma Linolenic Acid (GLA) 90 mg Under-dosed
  • Chlorophyll 81 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Calories 35
Calories from Fat 5
Total Fat 0.5 mg <1%
Total Carbohydrates 1 g <1%
Dietary Fiber 1 g 4%
Protein 5 g 10%
Sodium 45 mg <2%
Spirulina (Arthrospira platensis) Yielding approximately 9 g *
Protein 5 g 10%
Vitamin A (as Beta Carotene) 18000 IU 360%
Vitamin K 50 mcg 63%
Vitamin B12 8 mcg 133%
Calcium 20 mg 2%
Iron 4 mg 22%
Potassium 120 mg 3%
Phycocyanin 900 mg *
Gamma Linolenic Acid (GLA) 90 mg *
Linoleic Acid 81 mg *
Chlorophyll 81 mg *
Carotenoid 33 mg *

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$33$32$31$30$29 Mar 12 $31.49
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Source Naturals

Founded 1982 · Scotts Valley, CA, USA · 837 products · sourcenaturals.com/

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source
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Frequently Asked Questions
Is Source Naturals Spirulina Powder, 16 oz a good supplement?

Source Naturals Spirulina Powder, 16 oz received a product quality score of 63/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 20 active ingredients with 25 servings per container. The manufacturer, Source Naturals, holds a brand trust score of 66/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Source Naturals Spirulina Powder, 16 oz?

Source Naturals Spirulina Powder, 16 oz contains 20 active ingredients: Calories (35), Calories from Fat (5), Total Fat (0.5 mg), Total Carbohydrates (1 g), Dietary Fiber (1 g), Protein (5 g), and 14 more. Notable high-dose ingredients include Vitamin A at 360% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Source Naturals Spirulina Powder, 16 oz safe to take?

Source Naturals Spirulina Powder, 16 oz has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Source Naturals a trustworthy supplement brand?

Source Naturals receives a brand trust score of 66/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1982 and headquartered in Scotts Valley, CA, USA, the company offers 837 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.