PlainVitamins

Mega B-100

by Puritan's Pride · capsule · 100 rapid release capsules

  • On the market (NIH)
  • UPC 0 25077 10282 2
  • DSLD label 285567
  • Serving 1 capsule
  • 100 servings

Mega B-100 by Puritan's Pride lists 16 ingredients, 11 with an amount per serving of 1 capsule, such as 100 mg of thiamine, 100 mg of riboflavin, 100 mg of niacin and 100 mg of vitamin B6; 5 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on May 24, 2023.

What is in Mega B-100?

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

Mega B-100: Supplement Facts rows against the market (DSLD label 285567, January 2026 release)
IngredientAmount% DVAmong products listing it
Thiamineas Thiamine Mononitrate, Vitamin B1100 mg8,333%Thiamin in Mega B-100 against 9,830 products100 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg100 mg

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

Riboflavinas Vitamin B2100 mg7,692%Riboflavin in Mega B-100 against 9,824 products100 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg100 mg

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

Niacinas Niacinamide100 mg625%Niacin in Mega B-100 against 12,413 products100 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg100 mg

Higher than 88% of 12,413 products listing niacin (median 20 mg). 2.9 times the adult UL a day.

Vitamin B6as Pyridoxine Hydrochloride100 mg5,882%Vitamin B6 in Mega B-100 against 15,277 products100 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg100 mg

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

Folate1,333 mcg DFE333%
Folic Acid800 mcg
Vitamin B12as Cyanocobalamin100 mcg4,167%Vitamin B12 in Mega B-100 against 14,425 products100 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg100 mcg

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

Biotin1,000 mcg3,333%Biotin in Mega B-100 against 9,447 products1,000 mcg per serving; the middle half of products list 50 mcg to 300 mcg, the median 200 mcg.DV 30 mcg1,000 mcg

Higher than 84% of 9,447 products listing biotin (median 200 mcg).

Pantothenic Acidas D-Calcium Pantothenate100 mg2,000%Pantothenic Acid (Vitamin B5) in Mega B-100 against 10,060 products100 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg100 mg

Higher than 86% of 10,060 products listing pantothenic acid (vitamin B5) (median 12 mg).

Para-Aminobenzoic Acid100 mgPABA in Mega B-100 against 1,610 products100 mg per serving; the middle half of products list 10 mg to 50 mg, the median 25 mg.100 mg

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

Inositol100 mcgInositol in Mega B-100 against 4,042 products0.1 mg per serving; the middle half of products list 10 mg to 80 mg, the median 30 mg.0.1 mg

91% of 4,042 products listing inositol give more (median 30 mg).

Proprietary Blend7.5 mg
Alfalfain the blend, no amount given
Parsleyin the blend, no amount given
Rice Branin the blend, no amount given
Soy Lecithinin the blend, no amount given
Watercressin the blend, no amount given

Source: NIH ODS Dietary Supplement Label Database, label 285567 (entered May 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 100 mg of thiamin is higher than 94% of the 9,830 thiamin products that print an amount; 163 list more.
  • Its 100 mg of riboflavin is higher than 96% of the 9,824 riboflavin products that print an amount; 110 list more.
  • At 1 serving a day, the most its directions give, the label lists 100 mg of niacin, 2.9 times the adult Tolerable Upper Intake Level.
  • Its 100 mg of vitamin B6 is higher than 96% of the 15,277 vitamin B6 products that print an amount; 173 list more.
  • 91% of the 4,042 products that print an amount of inositol list more than its 0.1 mg of inositol (median 30 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 B-100'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
Directions: For adults, take one (1) capsule daily, preferably with a meal.
Warnings
Warning: Not intended for use by pregnant or nursing women. If you are taking any medications, have any medical conditions, or are planning to undergo any clinical lab testing, consult your doctor before use.
Some supplements may interact with certain medications and/or interfere with certain lab tests. If any adverse reactions occur, stop use and consult your doctor.
Keep out of reach of children.
Do not use if seal under cap is broken or missing.
Contains bioengineered food ingredients.
Storage
Store at room temperature.

Source: label statements in DSLD label 285567.

What else is on the label?

Other ingredients: Gelatin, Dicalcium Phosphate, Crospovidone, Calcium Silicate, Choline Bitartrate, Silica, Magnesium Stearate.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): QA Quality Assured.

How many labels does Mega B-100 have?

4 labels are on file under this name since June 24, 2016: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 285567 (current) Entered May 24, 2023 · on the market · 100 rapid release capsules · UPC 0 25077 10282 2
  2. Label 285048 Entered May 24, 2023 · on the market · 100 coated caplets · UPC 0 74312 10772 6
  3. Label 242410 Entered January 22, 2021 · on the market · 100 coated caplets · UPC 0 74312 10772 6
  4. Label 62291 Entered June 24, 2016 · off the market November 6, 2020 · 100 coated caplets · UPC 0 74312 10772 6

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

Who makes it?

The label names Puritan's Pride, Inc. (manufacturer), Ronkonkoma, NY, U.S.A.. All Puritan's Pride products.

Where next?