How many supplements exceed the adult upper limit?

Of 61,221 comparable product doses across 22 nutrients, 5.5% list a maximum daily dose above the adult Tolerable Upper Intake Level (UL).

SuppVerify · 2026-11-01 · CSV

Ingredients	UL	n	Above UL	Above 2× UL	Sources
Vitamin B3 (niacin)	35 mg	3,734	29.9% (1115)	534	source
Vitamin A	3,000 mcg	2,803	13.4% (376)	152	source
Magnesium	350 mg	4,119	10.0% (412)	94	source
Vitamin B9 (folate)	1,000 mcg	3,666	8.7% (320)	103	source
Manganese	11 mg	2,088	5.4% (112)	51	source
Zinc	40 mg	4,201	5.1% (213)	64	source
Vitamin D	100 mcg	3,900	4.7% (185)	34	source
Iodine	1,100 mcg	1,966	4.4% (87)	58	source
Vitamin B6	100 mg	4,888	3.4% (168)	87	source
Selenium	400 mcg	2,140	3.4% (72)	24	source
Iron	45 mg	2,143	3.1% (66)	14	source
Vitamin C	2,000 mg	6,572	1.9% (122)	31	source
Boron	20 mg	860	1.7% (15)	13	source
Molybdenum	2,000 mcg	1,194	1.6% (19)	1	source
Vanadium	1,800 mcg	419	1.4% (6)	6	source
Calcium	2,500 mg	5,053	0.9% (45)	2	source
Sodium	2,300 mg	3,159	0.8% (25)	0	source
Copper	10 mg	1,933	0.3% (5)	1	source
Choline	3,500 mg	1,338	0.1% (2)	0	source
Vitamin E	1,000 mg	3,930	0.1% (2)	0	source
Phosphorus	4,000 mg	801	0.0% (0)	0	source
Chloride	3,600 mg	314	0.0% (0)	0	source

Method

We use only product records that convert to a comparable daily dose in the same unit as the UL (product_dose.comparable=1, duplicates removed). The daily dose uses the highest number of servings the label suggests. ULs come from NIH ODS or the authority linked in the table. A nutrient is listed only with at least 20 products.

Limitations

Figures are as declared on labels and are not lab-tested.
Some ULs apply only to supplemental intake (e.g. magnesium) or to specific forms (e.g. vitamin A as preformed retinol, niacin as supplemental forms). This table does not split by form, so it may overstate the share.
Above the UL does not mean harmful: some products are meant for short-term use under medical supervision. This page makes no efficacy claims and is not medical advice.