Duo-Cal
by Douglas Laboratories · capsule · 120 vegetarian capsules
- On the market (NIH)
- DSLD label 10233
- Serving 1 vegetarian capsule
Duo-Cal by Douglas Laboratories lists 3 ingredients, 3 with an amount per serving of 1 vegetarian capsule, such as 73 mg of calcium, 400 mg of calcium phytate and 40 mg of calcium glucarate. Its current label entered the NIH Dietary Supplement Label Database on June 25, 2012.
What is in Duo-Cal?
Each row as the label prints it, per serving of 1 vegetarian 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).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Calciumas Calcium Glucarate, Calcium PhytateCalcium (Form: from Calcium Phytate, and Calcium Glucarate) | 73 mg | 6%* | 65% of 17,831 products listing calcium give more (median 115 mg). |
| Calcium Phytate | 400 mg | ||
| Calcium Glucarate | 40 mg | 92% of 98 products listing calcium d-glucarate give more (median 200 mg). |
* % Daily Value computed from the printed amount and the FDA Daily Value (21 CFR 101.9); the label prints none for that row.
Source: NIH ODS Dietary Supplement Label Database, label 10233 (entered June 25, 2012), 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:
- 92% of the 98 products that print an amount of calcium d-glucarate list more than its 40 mg of calcium glucarate (filed by NIH under calcium d-glucarate) (median 200 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?
The products whose ingredient lists overlap most with Duo-Cal's, rare ingredients counting for more.
- Ca D-GlucarateBiotics Research Corporation 2 shared, 45% alike
- Calcium D-GlucarateIndiana Botanic Gardens 2 shared, 45% alike
- Calcium D-Glucarate 500 mgNOW 2 shared, 45% alike
- Calcium D-GlucarateNatrol · off the market 2 shared, 45% alike
- Calcium D-Glucarate 250 mgSeeking Health · off the market 2 shared, 45% alike
- Calcium D-GlucarateSwanson Ultra · off the market 2 shared, 45% alike
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 Usage: As a dietary supplement, adults take 1 capsule daily or as directed by physician.
- Warnings
- KEEP OUT OF REACH OF CHILDREN.
- Tamper resistant package, do not use if outer seal is missing.
- Allergens and what it does not contain
- This product contains NO yeast, wheat gluten, soy protein, milk/dairy, corn, sodium, sugar, starch, art ificial coloring, preservatives or flavoring.
- Storage
- For optimal storage conditions, store in a cool, dry place. (59(0)-77(0)F/15(0)-25(0)C) (35-65% relative humidity)
Source: label statements in DSLD label 10233.
What else is on the label?
Other ingredients: Cellulose, Vegetable Stearate, Silica.
How many labels does Duo-Cal have?
One label is on file, entered on June 25, 2012.
- Label 10233 (current) Entered June 25, 2012 · on the market · 120 vegetarian capsules
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Douglas Laboratories (manufacturer), Pittsburgh, PA. All Douglas Laboratories products.