PlainVitamins

Spirulina 500 mg

by Source Naturals · tablet or pill · 500 tablets

  • On the market (NIH)
  • UPC 0 21078 00639 8
  • DSLD label 272840
  • Serving 6 tablets
  • 83 servings

Spirulina 500 mg by Source Naturals lists 3 ingredients, 3 with an amount per serving of 6 tablets, such as 509 mcg of vitamin A, 850 mcg of iron and 3 g of spirulina, beside 3 Nutrition Facts rows (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on August 23, 2022.

What is in Spirulina 500 mg?

Each row as the label prints it, per serving of 6 tablets. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Spirulina 500 mg: Supplement Facts rows against the market (DSLD label 272840, January 2026 release)
IngredientAmount% DVAmong products listing it
Calories10 Calories
Total Carbohydrates1 g1%Carbohydrate in Spirulina 500 mg against 21,979 products1 g per serving; the middle half of products list 1 g to 6 g, the median 3 g.1 g

74% of 21,979 products listing carbohydrate give more (median 3 g).

Protein2 g4%Protein in Spirulina 500 mg against 8,985 products2 g per serving; the middle half of products list 2 g to 24 g, the median 16 g.2 g

70% of 8,985 products listing protein give more (median 16 g).

Vitamin Aas Carotenoids509 mcg57%
Iron850 mcg4%Iron in Spirulina 500 mg against 6,910 products0.85 mg per serving; the middle half of products list 1.2 mg to 18 mg, the median 5 mg.DV 18 mgUL 45 mg0.85 mg

85% of 6,910 products listing iron give more (median 5 mg).

Sodium35 mg1%Sodium in Spirulina 500 mg against 14,514 products35 mg per serving; the middle half of products list 15 mg to 142 mg, the median 55 mg.35 mg

60% of 14,514 products listing sodium give more (median 55 mg).

Spirulina3 gBlue-Green Algae in Spirulina 500 mg against 709 products3,000 mg per serving; the middle half of products list 100 mg to 1,000 mg, the median 500 mg.3,000 mg

Higher than 91% of 709 products listing blue-green algae (median 500 mg).

Source: NIH ODS Dietary Supplement Label Database, label 272840 (entered August 23, 2022), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • Its 3,000 mg of spirulina (filed by NIH under blue-green algae) is higher than 91% of the 709 blue-green algae products that print an amount; 18 list more.

The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

4 products list the very same ingredients; the nearest amounts come first.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Suggested Use: 6 tablets daily with meals.
Warnings
Do not use if either tamper-evident seal is broken or missing.
Keep out of the reach of children.
Note: If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.
Allergens and what it does not contain
Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor or fragrance.
Non GMO Validated
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 272840.

What else is on the label?

Other ingredients: modified Cellulose Gum, Silica, Stearic Acid.

How many labels does Spirulina 500 mg have?

5 labels are on file under this name since June 23, 2017: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 272840 (current) Entered August 23, 2022 · on the market · 500 tablets · UPC 0 21078 00639 8
  2. Label 272837 Entered August 23, 2022 · on the market · 200 tablets · UPC 0 21078 00638 1
  3. Label 77482 Entered December 22, 2017 · on the market · 100 tablets · UPC 0 21078 00637 4
  4. Label 77484 Entered August 22, 2017 · off the market December 22, 2021 · 200 tablets · UPC 0 21078 00638 1
  5. Label 75422 Entered June 23, 2017 · off the market December 22, 2021 · 500 tablets · UPC 0 21078 00639 8

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Source Naturals, Inc. (distributor), Santa Cruz, CA. All Source Naturals products.

Where next?