PlainVitamins

O.p.a.

by Progressive Professional from Progressive Laboratories · liquid · 2 fluid ounces

  • On the market (NIH)
  • UPC 3 51821 00414 3
  • DSLD label 299204
  • Serving 4 ml (four to five droppers)
  • 15 servings

O.p.a. by Progressive Professional from Progressive Laboratories lists 4 ingredients, 4 with an amount per serving of 4 ml, such as 100 mcg of riboflavin, 125 mg of phosphorus and 21 mg of inositol. Its current label entered the NIH Dietary Supplement Label Database on November 22, 2023.

What is in O.p.a.?

Each row as the label prints it, per serving of 4 ml. 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).

O.p.a.: Supplement Facts rows against the market (DSLD label 299204, January 2026 release)
IngredientAmount% DVAmong products listing it
Riboflavin100 mcg6%Riboflavin in O.P.A. against 9,824 products0.1 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg0.1 mg

99% of 9,824 products listing riboflavin give more (median 4 mg).

Phosphorus125 mg13%Phosphorus in O.P.A. against 3,786 products125 mg per serving; the middle half of products list 45 mg to 200 mg, the median 90 mg.DV 1,250 mgUL 4,000 mg125 mg

Higher than 64% of 3,786 products listing phosphorus (median 90 mg).

Orthophosphoric Acid395 mg
Inositol21 mgInositol in O.P.A. against 4,042 products21 mg per serving; the middle half of products list 10 mg to 80 mg, the median 30 mg.21 mg

64% of 4,042 products listing inositol give more (median 30 mg).

Source: NIH ODS Dietary Supplement Label Database, label 299204 (entered November 22, 2023), 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:

  • 99% of the 9,824 products that print an amount of riboflavin list more than its 0.1 mg of riboflavin (median 4 mg).

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?

1 product lists 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
Directions: Four to five droppers diluted with water daily, or more, as directed by a health care professional.
Warnings
Sold only for dispensing by a licensed health care professional.
Not to be used by pregnant or lactating women.
Do not use if seal around cap is broken or missing.
Keep out of reach of children.

Source: label statements in DSLD label 299204.

What else is on the label?

Other ingredients: Water, Purified.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Certified GMP Compliant GMP Good Manufacturing Practices 21 CFR 111.

How many labels does O.p.a. have?

One label is on file, entered on November 22, 2023.

  1. Label 299204 (current) Entered November 22, 2023 · on the market · 2 fluid ounces · UPC 3 51821 00414 3

DSLD also links this label to: O.p.a. (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 Progressive Laboratories, Inc. (manufacturer), Irving, Texas. All Progressive Professional from Progressive Laboratories products.

Where next?