PlainVitamins

Mega-One

by Source Naturals · tablet or pill · 60 tablets

  • On the market (NIH)
  • UPC 0 21078 00008 2
  • DSLD label 295991
  • Serving 1 tablet
  • 60 servings

Mega-One by Source Naturals lists 32 ingredients, 32 with an amount per serving of 1 tablet, such as 12,000 IU of vitamin A, 250 mg of vitamin C, 400 IU (10 mcg) of vitamin D3 and 100 IU of vitamin E, beside 1 Nutrition Facts row (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on October 24, 2023.

What is in Mega-One?

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).

Mega-One: Supplement Facts rows against the market (DSLD label 295991, January 2026 release)
IngredientAmount% DVAmong products listing it
Total Carbohydrates1 g1%Carbohydrate in Mega-One against 21,979 products1 g per serving; the middle half of products list 1 g to 6 g, the median 3 g.1 g

74% of 21,979 products listing carbohydrate give more (median 3 g).

Vitamin A12,000 IU240%Vitamin A in Mega-One against 5,772 products12,000 IU per serving; the middle half of products list 2,000 IU to 5,000 IU, the median 4,000 IU.12,000 IU

Higher than 92% of 5,772 products listing vitamin A (median 4,000 IU).

Vitamin A Palmitate10,000 IU
Beta-Carotene2,000 IU
Vitamin Cas Calcium Ascorbate, Manganese Ascorbate, Zinc Ascorbate250 mg416%Vitamin C in Mega-One 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).

Vitamin D3as Cholecalciferol400 IU (10 mcg)100%Vitamin D in Mega-One 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 Vitamin E Succinate100 IU333%Vitamin E in Mega-One against 6,459 products100 IU per serving; the middle half of products list 15 IU to 100 IU, the median 30 IU.100 IU

Higher than 71% of 6,459 products listing vitamin E (median 30 IU).

Thiamineas Vitamin B185 mg5,667%Thiamin in Mega-One against 9,830 products85 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg85 mg

Higher than 94% of 9,830 products listing thiamin (median 5 mg).

Riboflavinas Vitamin B285 mg5,000%Riboflavin in Mega-One against 9,824 products85 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg85 mg

Higher than 96% of 9,824 products listing riboflavin (median 4 mg).

Niacinamide85 mg425%Niacin in Mega-One against 12,413 products85 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg85 mg

Higher than 88% of 12,413 products listing niacin (median 20 mg). 2.4 times the adult UL a day.

Vitamin B6as Pyridoxine Hydrochloride85 mg4,250%Vitamin B6 in Mega-One against 15,277 products85 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg85 mg

Higher than 96% of 15,277 products listing vitamin B6 (median 6 mg).

Folateas Folic Acid420 mcg105%Folate in Mega-One against 7,022 products420 mcg per serving; the middle half of products list 200 mcg to 400 mcg, the median 400 mcg.420 mcg

Higher than 76% of 7,022 products listing folate (median 400 mcg).

Vitamin B12as Cyanocobalamin85 mcg1,417%Vitamin B12 in Mega-One against 14,425 products85 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg85 mcg

Higher than 61% of 14,425 products listing vitamin B12 (median 36 mcg).

Biotin85 mcg28%Biotin in Mega-One against 9,447 products85 mcg per serving; the middle half of products list 50 mcg to 300 mcg, the median 200 mcg.DV 30 mcg85 mcg

67% of 9,447 products listing biotin give more (median 200 mcg).

Pantothenic Acidas Calcium D-Pantothenate85 mg850%Pantothenic Acid (Vitamin B5) in Mega-One against 10,060 products85 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg85 mg

Higher than 85% of 10,060 products listing pantothenic acid (vitamin B5) (median 12 mg).

Calciumas Calcium Ascorbate, Calcium Citrate40 mg4%Calcium in Mega-One against 17,831 products40 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg40 mg

79% of 17,831 products listing calcium give more (median 115 mg).

Ironas Ferrous Fumarate11 mg61%Iron in Mega-One against 6,910 products11 mg per serving; the middle half of products list 1.2 mg to 18 mg, the median 5 mg.DV 18 mgUL 45 mg11 mg

Higher than 70% of 6,910 products listing iron (median 5 mg).

Iodineas Potassium Iodide150 mcg100%Iodine in Mega-One against 6,382 products150 mcg per serving; the middle half of products list 75 mcg to 150 mcg, the median 150 mcg.DV 150 mcgUL 1,100 mcg150 mcg

15% of 6,382 products listing iodine give more (median 150 mcg).

Magnesiumas Magnesium Citrate, Magnesium Oxide20 mg5%Magnesium in Mega-One against 14,003 products20 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg20 mg

83% of 14,003 products listing magnesium give more (median 86 mg).

Zincas Zinc Ascorbate15 mg100%Zinc in Mega-One against 13,186 products15 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg15 mg

Higher than 56% of 13,186 products listing zinc (median 11 mg).

Seleniumas Selenium Amino Acid Chelate50 mcg71%Selenium in Mega-One against 7,658 products50 mcg per serving; the middle half of products list 27 mcg to 100 mcg, the median 55 mcg.DV 55 mcgUL 400 mcg50 mcg

56% of 7,658 products listing selenium give more (median 55 mcg).

Copperas Copper Sebacate1 mg50%Copper in Mega-One against 6,468 products1 mg per serving; the middle half of products list 0.5 mg to 2 mg, the median 1 mg.DV 0.9 mgUL 10 mg1 mg

40% of 6,468 products listing copper give more (median 1 mg).

Manganeseas Manganese Ascorbate6 mg300%Manganese in Mega-One against 7,016 products6 mg per serving; the middle half of products list 1 mg to 3.92 mg, the median 2 mg.DV 2.3 mgUL 11 mg6 mg

Higher than 90% of 7,016 products listing manganese (median 2 mg).

Chromiumas Chromium Amino Acid Chelate100 mcg83%Chromium in Mega-One against 7,825 products100 mcg per serving; the middle half of products list 45 mcg to 200 mcg, the median 100 mcg.DV 35 mcg100 mcg

47% of 7,825 products listing chromium give more (median 100 mcg).

Molybdenumas Molybdenum Amino Acid Chelate100 mcg133%Molybdenum in Mega-One against 4,390 products100 mcg per serving; the middle half of products list 25 mcg to 75 mcg, the median 50 mcg.DV 45 mcgUL 2,000 mcg100 mcg

Higher than 86% of 4,390 products listing molybdenum (median 50 mcg).

Potassiumas Potassium Citrate10 mg1%Potassium in Mega-One against 11,614 products10 mg per serving; the middle half of products list 50 mg to 190 mg, the median 99 mg.DV 4,700 mg10 mg

93% of 11,614 products listing potassium give more (median 99 mg).

Choline Bitartrate85 mg15%*Choline in Mega-One against 4,738 products85 mg per serving; the middle half of products list 18 mg to 100 mg, the median 40 mg.DV 550 mgUL 3,500 mg85 mg

Higher than 72% of 4,738 products listing choline (median 40 mg).

Para-Aminobenzoic Acid85 mgPABA in Mega-One against 1,610 products85 mg per serving; the middle half of products list 10 mg to 50 mg, the median 25 mg.85 mg

Higher than 86% of 1,610 products listing PABA (median 25 mg).

Inositol85 mgInositol in Mega-One against 4,042 products85 mg per serving; the middle half of products list 10 mg to 80 mg, the median 30 mg.85 mg

Higher than 75% of 4,042 products listing inositol (median 30 mg).

Bioflavonoid Complex25 mgFlavonoid in Mega-One against 2,343 products25 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.25 mg

66% of 2,343 products listing flavonoid give more (median 50 mg).

Rutin21 mgRutin in Mega-One against 1,232 products21 mg per serving; the middle half of products list 10 mg to 50 mg, the median 25 mg.21 mg

61% of 1,232 products listing rutin give more (median 25 mg).

Hesperidin5 mgHesperidin in Mega-One against 552 products5 mg per serving; the middle half of products list 10 mg to 50 mg, the median 20 mg.5 mg

80% of 552 products listing hesperidin give more (median 20 mg).

Boronas Boron Amino Acid Chelate1 mgBoron in Mega-One against 3,339 products1 mg per serving; the middle half of products list 0.3 mg to 2 mg, the median 1 mg.UL 20 mg1 mg

42% of 3,339 products listing boron give more (median 1 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 295991 (entered October 24, 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:

  • Its 12,000 IU of vitamin A is higher than 92% of the 5,772 vitamin A products that print an amount; 480 list more.
  • Its 85 mg of thiamin is higher than 94% of the 9,830 thiamin products that print an amount; 610 list more.
  • Its 85 mg of riboflavin is higher than 96% of the 9,824 riboflavin products that print an amount; 431 list more.
  • At 1 serving a day, the most its directions give, the label lists 85 mg of niacin, 2.4 times the adult Tolerable Upper Intake Level.
  • Its 85 mg of vitamin B6 is higher than 96% of the 15,277 vitamin B6 products that print an amount; 653 list more.
  • 93% of the 11,614 products that print an amount of potassium list more than its 10 mg of potassium (median 99 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 Mega-One'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
Suggested use: 1 tablet daily with a meal.
Mega-One is a potent one-tablet-a-day multi-vitamin.
Warnings
Contains soy.
Warning: Do not use if you are pregnant, may become pregnant, or breastfeeding.
Warning: Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of the reach of children. In case of accidental overdose, call a doctor or poison control center immediately.
Do not use if either tamper-evident seal is broken or missing.
Keep out of the reach of children.

Source: label statements in DSLD label 295991.

What else is on the label?

Other ingredients: Stearic Acid, Modified Cellulose Gum, Colloidal Silicon Dioxide, Magnesium Stearate.

How many labels does Mega-One have?

3 labels are on file under this name since October 24, 2022: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 295991 (current) Entered October 24, 2023 · on the market · 60 tablets · UPC 0 21078 00008 2
  2. Label 275350 Entered November 22, 2022 · off the market July 6, 2022 · 60 tablets · UPC 0 21078 00008 2
  3. Label 275352 Entered October 24, 2022 · on the market · 180 tablets · UPC 0 21078 00010 5

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

Who makes it?

The label names Source Naturals, Inc. (distributor), Santa Cruz, CA. All Source Naturals products.

Where next?