PlainVitamins

Ultra Potent-C 500

by Metagenics · tablet or pill · 90 tablets

  • On the market (NIH)
  • UPC 7 55571 03051 1
  • DSLD label 295871
  • Serving 1 tablet
  • 90 servings

Ultra Potent-C 500 by Metagenics lists 10 ingredients, 10 with an amount per serving of 1 tablet, such as 500 mg of vitamin C, 35 mg of niacin, 16 mg of L-lysine and 16 mg of citrus bioflavonoid complex, 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 Ultra Potent-C 500?

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).

Ultra Potent-C 500: Supplement Facts rows against the market (DSLD label 295871, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin C500 mg556%Vitamin C in Ultra Potent-C 500 against 18,583 products500 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg500 mg

Higher than 81% of 18,583 products listing vitamin C (median 100 mg). Per day at the most servings: 1,500 mg.

Niacin35 mg219%Niacin in Ultra Potent-C 500 against 12,413 products35 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg35 mg

Higher than 69% of 12,413 products listing niacin (median 20 mg). Per day at the most servings: 105 mg. 3 times the adult UL a day.

Sodium5 mg1%Sodium in Ultra Potent-C 500 against 14,514 products5 mg per serving; the middle half of products list 15 mg to 142 mg, the median 55 mg.5 mg

89% of 14,514 products listing sodium give more (median 55 mg). Per day at the most servings: 15 mg.

L-Lysine16 mgLysine in Ultra Potent-C 500 against 1,250 products16 mg per serving; the middle half of products list 148.25 mg to 996.25 mg, the median 500 mg.16 mg

96% of 1,250 products listing lysine give more (median 500 mg). Per day at the most servings: 48 mg.

Citrus Bioflavonoid Complex16 mgFlavonoid in Ultra Potent-C 500 against 2,343 products16 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.16 mg

86% of 2,343 products listing flavonoid give more (median 50 mg). Per day at the most servings: 48 mg.

full spectrum Bioflavonoidsstandardized to 45%7.2 mg
Tetrasodium Pyrophosphate7 mg
Alpha-D-Ribofuranose6 mgRibose in Ultra Potent-C 500 against 199 products0.006 g per serving; the middle half of products list 0.5 g to 5 g, the median 2 g.0.006 g

98% of 199 products listing ribose give more (median 2 g). Per day at the most servings: 0.018 g.

Xylitol5 mgXylitol in Ultra Potent-C 500 against 220 products0.005 g per serving; the middle half of products list 1 g to 2.5 g, the median 2 g.0.005 g

over 99% of 220 products listing xylitol give more (median 2 g). Per day at the most servings: 0.015 g.

L-Cysteine4 mgCysteine in Ultra Potent-C 500 against 516 products4 mg per serving; the middle half of products list 30 mg to 200 mg, the median 85 mg.4 mg

94% of 516 products listing cysteine give more (median 85 mg). Per day at the most servings: 12 mg.

L-Glutathione2 mgGlutathione in Ultra Potent-C 500 against 717 products2 mg per serving; the middle half of products list 10 mg to 200 mg, the median 50 mg.2 mg

95% of 717 products listing glutathione give more (median 50 mg). Per day at the most servings: 6 mg.

Source: NIH ODS Dietary Supplement Label Database, label 295871 (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:

  • At 3 servings a day, the most its directions give, the label lists 105 mg of niacin, 3 times the adult Tolerable Upper Intake Level.
  • 96% of the 1,250 products that print an amount of lysine list more than its 16 mg of L-lysine (filed by NIH under lysine) (median 500 mg).
  • 98% of the 199 products that print an amount of ribose list more than its 0.006 g of alpha-D-ribofuranose (filed by NIH under ribose) (median 2 g).
  • over 99% of the 220 products that print an amount of xylitol list more than its 0.005 g of xylitol (median 2 g).
  • 94% of the 516 products that print an amount of cysteine list more than its 4 mg of L-cysteine (filed by NIH under cysteine) (median 85 mg).
  • 95% of the 717 products that print an amount of glutathione list more than its 2 mg of L-glutathione (filed by NIH under glutathione) (median 50 mg).

The NIH database records 3 servings 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 Ultra Potent-C 500'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: Take one tablet three times daily or as directed by your healthcare practitioner.
Warnings
Caution: Keep out of the reach of children.
Practitioner exclusive
Allergens and what it does not contain
This product is non-GMO, gluten-free, and vegetarian.
Certified Gluten Free GFCO.org (Gluten-Free Certification Organization)

Source: label statements in DSLD label 295871.

What else is on the label?

Other ingredients: Calcium Ascorbate, Niacinamide Ascorbate, Ascorbic Acid, Sodium Ascorbate, Magnesium Ascorbate, L-Lysine Hydrochloride, Ascorbyl Palmitate, Citrus Bioflavonoid Complex, Potassium Ascorbate, Tetrasodium Pyrophosphate, Alpha-D-Ribofuranose, L-Cysteine Hydrochloride, Xylitol, L-Glutathione, Microcrystalline Cellulose, Cellulose, Stearic Acid, Croscarmellose Sodium, Niacinamide, Magnesium Stearate, Hypromellose, Medium Chain Triglyceride, Hydroxypropyl Cellulose.

How many labels does Ultra Potent-C 500 have?

5 labels are on file under this name since November 25, 2013: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 295871 (current) Entered October 24, 2023 · on the market · 90 tablets · UPC 7 55571 03051 1
  2. Label 265018 Entered June 16, 2022 · off the market September 7, 2022 · 90 tablets · UPC 7 55571 03051 1
  3. Label 216574 Entered March 24, 2020 · off the market October 1, 2021 · 90 tablets · UPC 7 55571 03051 1
  4. Label 209501 Entered December 22, 2019 · off the market December 20, 2019 · 90 tablets
  5. Label 27781 Entered November 25, 2013 · off the market May 31, 2019 · 90 tablets · UPC 7 55571 03051 1

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

Who makes it?

The label names Metagenics (manufacturer), Gig Harbor, WA. All Metagenics products.

Where next?