Seal on the label
USP Verified mark on supplement labels
374 products in the NIH Dietary Supplement Label Database print the USP Verified mark on their label, 301 of them on the market; they list vitamin D 2.8 times as often as supplements overall (36% against 13%); 75% list at least one vitamin (DSLD version 9.4.0, January 2026).
Data: NIH ODS Dietary Supplement Label Database, version 9.4.0, current labels; Daily Values 21 CFR 101.9.
USP (the U.S. Pharmacopeia) verifies that a product contains the listed ingredients in the declared amounts, does not contain specified contaminants, will break down and release into the body within a specified time, and was made under good manufacturing practices. To confirm a product, use USP's list of verified products.
How the two counts differ: 374 labels in the NIH database print the mark (301 on the market), while the certifier's own list says "More than 160 different dietary supplement formulas have received the USP Verified Mark", from 16 brands (read October 7, 2026). A DSLD label shows the mark as printed when NIH transcribed it, so it can outlast the product's place in the program; one formula sold in several sizes or flavors is several labels; and the certifier counts formulas. The label is the label's claim; the certifier's list is the current one. The certifier's list.
What kinds of ingredient do products printing the USP Verified mark list?
The share of products printing the USP Verified mark listing at least one ingredient of each kind (how kinds are counted):
USP Verified mark: share listing each kind of ingredient
374 products; a product counts once per kind.
Source: Supplement Facts rows of each product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0, by the ingredient category DSLD records.
What do products printing the USP Verified mark contain?
Vitamin D is the single ingredient they list most (36% of them), then vitamin C (34%) and vitamin B12 (30%). The table sets their median amount per serving against the median of every product listing the same ingredient.
| Ingredient | Share listing it | Median here | All products |
|---|---|---|---|
| Vitamin D | 36% | 12.5 mcg | 15 mcg |
| Vitamin C | 34% | 150 mg | 100 mg |
| Vitamin B12 | 30% | 9 mcg | 36 mcg |
| Calcium | 28% | 200 mg | 115 mg |
| Vitamin E | 28% | 47.5 IU | 30 IU |
| Vitamin B6 | 25% | 2 mg | 6 mg |
| Folate | 24% | 400 mcg | 400 mcg |
| Niacin | 24% | 20 mg | 20 mg |
| Vitamin A | 22% | 3,000 IU | 4,000 IU |
| Thiamin | 21% | 1.5 mg | 5 mg |
| Zinc | 21% | 15 mg | 11 mg |
| Riboflavin | 21% | 1.7 mg | 4 mg |
| Biotin | 18% | 30 mcg | 200 mcg |
| Pantothenic Acid (Vitamin B5) | 18% | 10 mg | 12 mg |
| Magnesium | 16% | 100 mg | 86 mg |
Source: Supplement Facts rows of each product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0.
What kinds of products are they?
USP Verified mark by DSLD product type
Brands with the most: Nature Made (188), Longs Wellness (42), Kirkland Signature (37), Equaline (35), Sunmark (32), Simply Right (6), Nature Made Kids First (5), Nature Made VitaMelts (5), Member's Mark (5), Schiff (4).
Which products are they?
60 of the 374: on-market products first, the newest label first. Each ingredient page lists every product that contains it.
- Multi with Omega-3Nature Made Kids First
- Glucosamine HCl 1500 mg Chondroitin Sulfate Sodium 1200 mgMember's Mark
- Ultra Triple Action Joint HealthMember's Mark2 labels
- C 1000 mgNature Made3 labels
- D3 1000 IU (25 mcg)Nature Made6 labels
- C 500 mgNature Made6 labels
- C Chewable 1000 mg Original OrangeNature Made
- D3 2000 IU (50 mcg)Nature Made11 labels
- Turmeric Extra Strength 1000 mg (950 mg Curcuminoids)Nature Made
- CoQ10 200 mgNature Made10 labels
- Krill Oil 500 mgNature Made
- Melatonin Extra Strength 5 mg Dreamy StrawberryNature Made
- Multi + Omega-3 Adult GummiesNature Made4 labels
- Multi + Omega-3 for Him GummiesNature Made3 labels
- Multi + Omega-3 GummiesNature Made3 labels
- Multi For Him Gummies Cherry & Mixed BerryNature Made
- C 500 mg with Rose HipsNature Made
- D3 50 2000 IU (50 mg)Nature Made
- Vitamin B-12 500 mcgNature Made
- Vitamin C 500 mgNature Made13 labels
- Calcium Magnesium Zinc with Vitamin D3Nature Made
- D3 400 IUNature Made2 labels
- Maximum Strength Biotin 5,000 mcgNature Made7 labels
- Melatonin 5 mg Fast Dissolve Strawberry Natural FlavorNatrol6 labels
- Omega-3 from Fish Oil Pearls 550 mgNature Made
- Vitamin B-12 Vitamin 500 mcgNature Made
- Calcium 750 mg+D+KNature Made4 labels
- Iron 65 mgNature Made8 labels
- Vitamin E 400 IUNature Made6 labels
- Zinc 30 mgNature Made4 labels
- Calcium 600 mg with Vitamin D3Nature Made2 labels
- Vitamin E 450 mg (1000 IU)Nature Made
- Prenatal Folic Acid + DHANature Made
- BioAstin 12 mgBioAstin3 labels
- Prenatal All-in-One Softgel Folic Acid + DHA + CholineNature Made
- Calcium 500 mg + D3 25 mcg Natural Fruit & Cream Flavorsvitafusion
- Energy B12 Gummies 1000 mcgNature Made2 labels
- Extra Strength Chewable C 1000 mgNature Made
- Fish Oil 1000 mgNature Made12 labels
- Fish Oil GummiesNature Made2 labels
- Melatonin 3 mgNature Made6 labels
- Multi For Her 50+Nature Made2 labels
- Super B Energy ComplexNature Made3 labels
- B12 1000 mcgNature Made3 labels
- 10 Strain ProbioticMember's Mark2 labels
- Advanced Digestive ProbioticTRUNATURE3 labels
- B1 100 mgNature Made
- Calcium 600 mg with Vitamin D3Kirkland Signature2 labels
- CoQ10 100 mgNature Made9 labels
- CoQ10 400 mgNature Made4 labels
- E 180 mg (400 IU)Kirkland Signature
- C 1000 mgKirkland Signature
- Calcium 750 mgNature Made
- Calcium Magnesium ZincNature Made7 labels
- Chewable C 500 mg Tangy Orange TasteKirkland Signature
- D3 50 mcg (2000 IU)Kirkland Signature
- E 1000 IU (450 mg)Nature Made
- E 400 IU (180 mg)Nature Made2 labels
- E 400 IU (267 mg)Nature Made
- K2 100 mcgNature Made
Source: NIH ODS Dietary Supplement Label Database version 9.4.0. How products are chosen: a seal or certification named in the label's printed statements, as DSLD transcribed them; the certifier's own list is where to confirm it.