PlainVitamins

Ultra Potent-C Powder

by Metagenics · powder · 8.39 ounces

  • On the market (NIH)
  • UPC 7 55571 03062 7
  • DSLD label 295873
  • Serving 1.95 g (1/4 rounded teaspoon)
  • 122 servings

Ultra Potent-C Powder by Metagenics lists 12 ingredients, 12 with an amount per serving of 1.95 g, such as 1,088 mg of vitamin C, 84 mg of niacin, 50 mg of calcium and 8 mg of magnesium, beside 1 Nutrition Facts row (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on August 23, 2023.

What is in Ultra Potent-C Powder?

Each row as the label prints it, per serving of 1.95 g. 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 Powder: Supplement Facts rows against the market (DSLD label 295873, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin C1,088 mg1,209%Vitamin C in Ultra Potent-C Powder against 18,583 products1,088 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg1,088 mg

Higher than 98% of 18,583 products listing vitamin C (median 100 mg).

Niacin84 mg525%Niacin in Ultra Potent-C Powder against 12,413 products84 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg84 mg

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

Calcium50 mg4%Calcium in Ultra Potent-C Powder against 17,831 products50 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg50 mg

72% of 17,831 products listing calcium give more (median 115 mg).

Magnesium8 mg2%Magnesium in Ultra Potent-C Powder against 14,003 products8 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg8 mg

94% of 14,003 products listing magnesium give more (median 86 mg).

Sodium15 mg1%Sodium in Ultra Potent-C Powder against 14,514 products15 mg per serving; the middle half of products list 15 mg to 142 mg, the median 55 mg.15 mg

72% of 14,514 products listing sodium give more (median 55 mg).

Xylitol192 mgXylitol in Ultra Potent-C Powder against 220 products0.192 g per serving; the middle half of products list 1 g to 2.5 g, the median 2 g.0.192 g

96% of 220 products listing xylitol give more (median 2 g).

L-Lysine40 mgLysine in Ultra Potent-C Powder against 1,250 products40 mg per serving; the middle half of products list 148.25 mg to 996.25 mg, the median 500 mg.40 mg

90% of 1,250 products listing lysine give more (median 500 mg).

Citrus Bioflavonoid Complexstandardized to38 mgFlavonoid in Ultra Potent-C Powder against 2,343 products38 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.38 mg

60% of 2,343 products listing flavonoid give more (median 50 mg).

full spectrum Bioflavonoids45%17 mg
Tetrasodium Pyrophosphate16 mg
Alpha-D-Ribofuranose15 mgRibose in Ultra Potent-C Powder against 199 products0.015 g per serving; the middle half of products list 0.5 g to 5 g, the median 2 g.0.015 g

94% of 199 products listing ribose give more (median 2 g).

L-Cysteine11 mgCysteine in Ultra Potent-C Powder against 516 products11 mg per serving; the middle half of products list 30 mg to 200 mg, the median 85 mg.11 mg

84% of 516 products listing cysteine give more (median 85 mg).

L-Glutathione5 mgGlutathione in Ultra Potent-C Powder against 717 products5 mg per serving; the middle half of products list 10 mg to 200 mg, the median 50 mg.5 mg

85% of 717 products listing glutathione give more (median 50 mg).

Source: NIH ODS Dietary Supplement Label Database, label 295873 (entered August 23, 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 1,088 mg of vitamin C is higher than 98% of the 18,583 vitamin C products that print an amount; 408 list more.
  • At 1 serving a day, the most its directions give, the label lists 84 mg of niacin, 2.4 times the adult Tolerable Upper Intake Level.
  • 94% of the 14,003 products that print an amount of magnesium list more than its 8 mg of magnesium (median 86 mg).
  • 96% of the 220 products that print an amount of xylitol list more than its 0.192 g of xylitol (median 2 g).
  • 90% of the 1,250 products that print an amount of lysine list more than its 40 mg of L-lysine (filed by NIH under lysine) (median 500 mg).
  • 94% of the 199 products that print an amount of ribose list more than its 0.015 g of alpha-D-ribofuranose (filed by NIH under ribose) (median 2 g).

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 Ultra Potent-C Powder'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 best results, mix a rounded 1/4 teaspoon into four to six ounces of warm water and stir well. Take one time daily or as directed by your healthcare practitioner.
Warnings
Caution: Keep out of the reach of children.
Tamper Evident: Do not use if safety seal is missing or broken.
Practitioner Exclusive
Allergens and what it does not contain
This product is non-GMO, gluten-free and vegetarian.
Certified Gluten Free GFCO.org
Storage
Storage: Keep tightly closed in a cool, dry place.

Source: label statements in DSLD label 295873.

What else is on the label?

Other ingredients: Ultra Potent-C.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): GFCO.org (Gluten-Free Certification Organization). Listed with: Certified gluten-free (GFCO) (a seal is the label's claim; the certifier's own list confirms it).

How many labels does Ultra Potent-C Powder have?

4 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 295873 (current) Entered August 23, 2023 · on the market · 8.39 ounces · UPC 7 55571 03062 7
  2. Label 216593 Entered March 24, 2020 · off the market September 7, 2022 · 8.39 ounces · UPC 7 55571 03062 7
  3. Label 209498 Entered November 21, 2019 · off the market December 20, 2019 · 8.39 ozs
  4. Label 27755 Entered November 25, 2013 · off the market July 1, 2019 · 8 oz. · UPC 7 55571 03087 7

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?