PlainVitamins

Maximum Once A Day

by Quest · tablet or pill · 60 tablets

  • Off the market since October 2023 (NIH)
  • UPC 0 58371 21370 3
  • DSLD label 24139
  • Serving 1 tablet

Maximum Once A Day by Quest lists 27 ingredients, 27 with an amount per serving of 1 tablet, such as 6,000 mcg of beta-carotene, 1,510 mcg RAE of vitamin A, 10 mcg (400 IU) of vitamin D and 67 mg AT of vitamin E. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2013.

What is in Maximum Once A Day?

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

Maximum Once A Day: Supplement Facts rows against the market (DSLD label 24139, January 2026 release)
IngredientAmount% DVAmong products listing it
Beta-CaroteneBeta-carotene Note: 10,000 IU6,000 mcg
Vitamin Aas Vitamin A PalmitateVitamin A (Form: Vitamin A Palmitate) Note: 5000 IU1,510 mcg RAE
Vitamin Das CholecalciferolVitamin D (Form: Cholecalciferol) Note: 400 IU10 mcg (400 IU)50%*Vitamin D in Maximum Once A Day against 14,175 products10 mcg per serving; the middle half of products list 10 mcg to 25 mcg, the median 15 mcg.DV 20 mcgUL 100 mcg10 mcg

57% of 14,175 products listing vitamin D give more (median 15 mcg).

Vitamin Eas D-Alpha-Tocopheryl SuccinateVitamin E (Form: d-alpha tocopheryl succinate) Note: 100 IU67 mg AT447%*
Vitamin Cas Ascorbic Acid250 mg278%*Vitamin C in Maximum Once A Day against 18,583 products250 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg250 mg

Higher than 68% of 18,583 products listing vitamin C (median 100 mg).

Thiamineas Thiamine Hydrochloride75 mg6,250%*Thiamin in Maximum Once A Day against 9,830 products75 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg75 mg

Higher than 92% of 9,830 products listing thiamin (median 5 mg).

Riboflavin75 mg5,769%*Riboflavin in Maximum Once A Day against 9,824 products75 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg75 mg

Higher than 94% of 9,824 products listing riboflavin (median 4 mg).

Niacinamide75 mg469%*Niacin in Maximum Once A Day against 12,413 products75 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg75 mg

Higher than 85% of 12,413 products listing niacin (median 20 mg). 2.1 times the adult UL a day.

Pantothenic Acidas D-Calcium Pantothenate75 mg1,500%*Pantothenic Acid (Vitamin B5) in Maximum Once A Day against 10,060 products75 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg75 mg

Higher than 83% of 10,060 products listing pantothenic acid (vitamin B5) (median 12 mg).

Vitamin B6as Pyridoxine Hydrochloride75 mg4,412%*Vitamin B6 in Maximum Once A Day against 15,277 products75 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg75 mg

Higher than 94% of 15,277 products listing vitamin B6 (median 6 mg).

Folateas Folic Acid1 mgFolate in Maximum Once A Day against 7,022 products1,000 mcg per serving; the middle half of products list 200 mcg to 400 mcg, the median 400 mcg.1,000 mcg

Higher than 93% of 7,022 products listing folate (median 400 mcg).

Vitamin B12as Cyanocobalamin75 mcg3,125%*Vitamin B12 in Maximum Once A Day against 14,425 products75 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg75 mcg

Higher than 60% of 14,425 products listing vitamin B12 (median 36 mcg).

Biotin75 mcg250%*Biotin in Maximum Once A Day against 9,447 products75 mcg per serving; the middle half of products list 50 mcg to 300 mcg, the median 200 mcg.DV 30 mcg75 mcg

68% of 9,447 products listing biotin give more (median 200 mcg).

Choline Bitartrate75 mg14%*Choline in Maximum Once A Day against 4,738 products75 mg per serving; the middle half of products list 18 mg to 100 mg, the median 40 mg.DV 550 mgUL 3,500 mg75 mg

Higher than 69% of 4,738 products listing choline (median 40 mg).

Inositol75 mgInositol in Maximum Once A Day against 4,042 products75 mg per serving; the middle half of products list 10 mg to 80 mg, the median 30 mg.75 mg

Higher than 72% of 4,042 products listing inositol (median 30 mg).

Methionineas DL-Methionine50 mgMETHIONINE in Maximum Once A Day against 981 products50 mg per serving; the middle half of products list 25 mg to 250 mg, the median 100 mg.50 mg

58% of 981 products listing METHIONINE give more (median 100 mg).

Calciumas Calcium Carbonate, Calcium Citrate150 mg12%*Calcium in Maximum Once A Day against 17,831 products150 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg150 mg

Higher than 58% of 17,831 products listing calcium (median 115 mg).

Magnesiumas Magnesium Citrate, Magnesium Oxide75 mg18%*Magnesium in Maximum Once A Day against 14,003 products75 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg75 mg

52% of 14,003 products listing magnesium give more (median 86 mg).

Potassiumas Potassium Citrate50 mg1%*Potassium in Maximum Once A Day against 11,614 products50 mg per serving; the middle half of products list 50 mg to 190 mg, the median 99 mg.DV 4,700 mg50 mg

72% of 11,614 products listing potassium give more (median 99 mg).

Ironas Ferrous Fumarate15 mg83%*Iron in Maximum Once A Day against 6,910 products15 mg per serving; the middle half of products list 1.2 mg to 18 mg, the median 5 mg.DV 18 mgUL 45 mg15 mg

Higher than 72% of 6,910 products listing iron (median 5 mg).

Zincas Zinc Citrate20 mg182%*Zinc in Maximum Once A Day against 13,186 products20 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg20 mg

Higher than 79% of 13,186 products listing zinc (median 11 mg).

Manganeseas Manganese Gluconate5 mg217%*Manganese in Maximum Once A Day against 7,016 products5 mg per serving; the middle half of products list 1 mg to 3.92 mg, the median 2 mg.DV 2.3 mgUL 11 mg5 mg

Higher than 80% of 7,016 products listing manganese (median 2 mg).

Copperas Copper Gluconate2 mg222%*Copper in Maximum Once A Day against 6,468 products2 mg per serving; the middle half of products list 0.5 mg to 2 mg, the median 1 mg.DV 0.9 mgUL 10 mg2 mg

Higher than 66% of 6,468 products listing copper (median 1 mg).

Iodineas Potassium Iodide100 mcg67%*Iodine in Maximum Once A Day against 6,382 products100 mcg per serving; the middle half of products list 75 mcg to 150 mcg, the median 150 mcg.DV 150 mcgUL 1,100 mcg100 mcg

59% of 6,382 products listing iodine give more (median 150 mcg).

Seleniumas {selenium} HVP chelate100 mcg182%*Selenium in Maximum Once A Day against 7,658 products100 mcg per serving; the middle half of products list 27 mcg to 100 mcg, the median 55 mcg.DV 55 mcgUL 400 mcg100 mcg

Higher than 65% of 7,658 products listing selenium (median 55 mcg).

Chromiumas {chromium} HVP chelate50 mcg143%*Chromium in Maximum Once A Day against 7,825 products50 mcg per serving; the middle half of products list 45 mcg to 200 mcg, the median 100 mcg.DV 35 mcg50 mcg

67% of 7,825 products listing chromium give more (median 100 mcg).

Vanadiumas {vanadium} HVP chelate50 mcgVanadium in Maximum Once A Day against 1,744 products50 mcg per serving; the middle half of products list 10 mcg to 100 mcg, the median 25 mcg.UL 1,800 mcg50 mcg

Higher than 59% of 1,744 products listing vanadium (median 25 mcg).

Molybdenumas Sodium Molybdate50 mcg

* % 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 24139 (entered August 23, 2013), 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:

  • Its 75 mg of thiamin is higher than 92% of the 9,830 thiamin products that print an amount; 663 list more.
  • Its 75 mg of riboflavin is higher than 94% of the 9,824 riboflavin products that print an amount; 486 list more.
  • At 1 serving a day, the most its directions give, the label lists 75 mg of niacin, 2.1 times the adult Tolerable Upper Intake Level.
  • Its 75 mg of vitamin B6 is higher than 94% of the 15,277 vitamin B6 products that print an amount; 715 list more.
  • Its 1,000 mcg of folate is higher than 93% of the 7,022 folate products that print an amount; 183 list more.

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 Maximum Once A Day'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
Recommended Use: A factor in the maintenance of good health. Recommended Dose (Adults): Take 1 tablet daily with a meal, a few hours before or after taking medications.
Warnings
Risk Information: For adult use only.
KEEP OUT OF REACH OF CHILDREN.
DO NOT USE IF SEAL UNDER CAP IS BROKEN.
Warning: There is enough iron in this product to seriously harm a child.
Consult a health care practitioner prior to use if pregnant or breastfeeding, or if you have a liver disorder.
Allergens and what it does not contain
This product does not contain dairy, egg, gluten, shellfish or sulfites.
No artificial colours, flavours or preservatives
Storage
STORE IN A COOL, DRY PLACE.

Source: label statements in DSLD label 24139.

What else is on the label?

Other ingredients: PABA, Citrus Bioflavonoids, Betaine HCl, Hesperidin, Rutin, Alfalfa, Croscarmellose Sodium, Kelp, Magnesium Stearate, Cellulose, Parsley, Rice Bran, Rosehips, Stearic Acid, Watercress, Hypromellose, Glycerin.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): PREMIUM - QUALITY ASSURED; {Recycle}; SunOpta A healthy products company.

How many labels does Maximum Once A Day have?

One label is on file, entered on August 23, 2013.

  1. Label 24139 (current) Entered August 23, 2013 · off the market October 12, 2023 · 60 tablets · UPC 0 58371 21370 3

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

Who makes it?

The label names SunOpta Inc. (manufacturer), Acton, ON. All Quest products.

Where next?