PlainVitamins

Standardized Spirulina 500 mg

by Swanson Ultra · capsule · 90 veggie capsules

  • Off the market since December 2023 (NIH)
  • UPC 0 87614 02948 1
  • DSLD label 185155
  • Serving 1 veggie capsule

Standardized Spirulina 500 mg by Swanson Ultra lists 5 ingredients, 5 with an amount per serving of 1 veggie capsule, such as 375 mcg RAE of vitamin A, 4 mcg of vitamin K and 500 mg of spirulina. Its current label entered the NIH Dietary Supplement Label Database on January 7, 2019.

What is in Standardized Spirulina 500 mg?

Each row as the label prints it, per serving of 1 veggie capsule. 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).

Standardized Spirulina 500 mg: Supplement Facts rows against the market (DSLD label 185155, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Aas Beta-Carotene, SpirulinaVitamin A (Form: as Beta-Carotene, from Spirulina Note: typical analysis (nutrients are naturally occurring))375 mcg RAE42%
Vitamin Kas SpirulinaVitamin K (Form: from Spirulina Note: typical analysis (nutrients are naturally occurring))4 mcg3%Vitamin K in Standardized Spirulina 500 mg against 4,607 products4 mcg per serving; the middle half of products list 35 mcg to 100 mcg, the median 80 mcg.DV 120 mcg4 mcg

99% of 4,607 products listing vitamin K give more (median 80 mcg). Per day at the most servings: 8 mcg.

Spirulina500 mgBlue-Green Algae in Standardized Spirulina 500 mg against 709 products500 mg per serving; the middle half of products list 100 mg to 1,000 mg, the median 500 mg.500 mg

38% of 709 products listing blue-green algae give more (median 500 mg). Per day at the most servings: 1,000 mg.

Total Phycocyanin50 mgPhycocyanin in Standardized Spirulina 500 mg against 40 products50 mg per serving; the middle half of products list 123.75 mg to 300 mg, the median 225 mg.50 mg

88% of 40 products listing phycocyanin give more (median 225 mg). Per day at the most servings: 100 mg.

Zeaxanthin475 mcgZeaxanthin in Standardized Spirulina 500 mg against 1,215 products0.475 mg per serving; the middle half of products list 0.4 mg to 2 mg, the median 1 mg.0.475 mg

68% of 1,215 products listing zeaxanthin give more (median 1 mg). Per day at the most servings: 0.95 mg.

Source: NIH ODS Dietary Supplement Label Database, label 185155 (entered January 7, 2019), version 9.4.0. See the label on DSLD. 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:

  • 99% of the 4,607 products that print an amount of vitamin K list more than its 4 mcg of vitamin K (median 80 mcg).
  • 88% of the 40 products that print an amount of phycocyanin list more than its 50 mg of total phycocyanin (filed by NIH under phycocyanin) (median 225 mg).

The NIH database records 2 servings 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?

The products whose ingredient lists overlap most with Standardized Spirulina 500 mg's, rare ingredients counting for more.

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: As a dietary supplement, take one veggie capsule two times per day with water.
Warnings
Do not use if seal is broken.
Keep out of reach of children.
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 185155.

What else is on the label?

Other ingredients: Hypromellose, Rice Flour, May contain one or more of the following.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): V Vegetarian formula Guaranteed purity & potency.

How many labels does Standardized Spirulina 500 mg have?

One label is on file, entered on January 7, 2019.

  1. Label 185155 (current) Entered January 7, 2019 · off the market December 5, 2023 · 90 veggie capsules · UPC 0 87614 02948 1

DSLD also links this label to: Spirulina 500 mg (image difference, same product).

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

Who makes it?

The label names Swanson Health Products (distributor), Fargo, ND. All Swanson Ultra products.

Where next?