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Ultra Potent-C® 1000 Vitamin C

High-potency buffered vitamin C for daily immune and antioxidant support. Stomach-friendly formulation.*

Vitamins & Minerals
Essential Wellness
Immune Health
Diagram of white blood cells beside a Vitamin C tablet with text comparing higher white blood cell uptake to plain vitamin C.
Smiling person next to a bowl of oranges with text listing benefits of a high‑potency vitamin C complex, including immune health, antioxidant support, and enhanced absorption
Orange background with an orange and a Metagenics supplement bottle beside diagrams highlighting better white blood cell absorption, bioflavonoids for stability, and a gut‑friendly low‑acid formula
Blue background with an orange slice and a Vitamin C tablet beside text listing ingredient amounts such as vitamin C, citrus bioflavonoids, amino acids, and niacin, along with an immune support callout.

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Why You'll Love Ultra Potent-C® 1000 Vitamin C

Your immune system works hard every day, especially during seasonal changes and periods of stress. Ultra Potent-C® 1000 is a vitamin C supplement that provides 1000mg of vitamin C per tablet—about the same amount you'd get from eating four oranges—in a buffered formula that's easy on your stomach while delivering potent, absorbable vitamin C.*

  • Preliminary research suggests it may be better absorbed than ascorbic acid alone*
  • Provides antioxidant support to help protect your cells*
  • Helps the body absorb iron*

The Science Inside

How It Works: Most vitamin C supplements use a single form of ascorbic acid. Ultra Potent-C® 1000 combines ascorbic acid with mineral-based forms of vitamin C (like calcium ascorbate and sodium ascorbate) to reduce acidity, which is why it’s easier to digest.* By using multiple forms of vitamin C, along with key nutrients, this formulation supports your body's ability to absorb and use these compounds.*

Key Ingredients:

  • Vitamin C (1,000mg): Delivered as a buffered blend of multiple ascorbate forms for a more balanced approach to high-dose supplementation.
  • Citrus Bioflavonoid Complex (32mg): Plant compounds naturally found in citrus fruits that work alongside vitamin C, both in nature and in this formula.
  • L-Lysine (33mg) and L-Cysteine (8mg): Amino acids that complement vitamin C.
  • L-Glutathione (5mg): One of the body's most important antioxidants, included to complement the overall formula.*
  • Niacin (70mg): A B vitamin that supports energy metabolism.

Allergen Information

Non-GMO | Gluten-free | Vegetarian

IngredientAmount% Daily Value
Serving Size1 Tablet
Servings Per Container90
Vitamin C1,000 mg1,111%
Niacin70 mg438%
Calcium40 mg3%
Sodium10 mg<1%
L-Lysine33 mg**
Citrus Bioflavonoid Complex [standardized to 45% (14.4 mg) full spectrum bioflavonoids]32 mg**
Tetrasodium Pyrophosphate14 mg**
Alpha D-Ribofuranose13 mg**
Xylitol9 mg**
L-Cysteine8 mg**
L-Glutathione5 mg**

**Daily Value not established.

Other Ingredients: Ultra Potent-C (calcium ascorbate, niacinamide ascorbate, ascorbic acid, sodium
ascorbate, magnesium ascorbate, L-lysine HCl, ascorbyl palmitate, citrus bioflavonoid complex,
potassium ascorbate, tetrasodium pyrophosphate, alpha D-ribofuranose, L-cysteine HCl, xylitol,
and L-glutathione), microcrystalline cellulose, hydroxypropylcellulose, croscarmellose sodium,
coating (hypromellose, medium-chain triglycerides, and hydroxypropylcellulose), silica, niacinamide, and magnesium stearate (vegetable).



SKU: U1000

Take one tablet up to two times daily, or as directed by your healthcare practitioner.

Dry Place

Ultra Potent-C® 1000 Vitamin C

Keep out of the reach of children.

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Frequently Asked Questions

Most vitamin C supplements rely on a single form of ascorbic acid. Ultra Potent-C 1000, and similar forms like Ultra Potent-C® Chewable Vitamin C, combine multiple buffered forms of vitamin C with bioflavonoids, L-lysine, and glutathione, and are specially formulated to enhance absorption by white blood cells compared to regular ascorbic acid.*

Buffered vitamin C combines ascorbic acid with minerals like calcium and sodium to reduce acidity, making it gentler on digestion while still delivering high-potency vitamin C.* This may be especially helpful for people who have experienced stomach discomfort from standard vitamin C supplements, but want the antioxidant benefits of vitamin C for immune health.*

Yes. Ultra Potent-C 1000 uses a buffered formula designed to be easily digested.* It can be a good option for those wanting daily immune support without the digestive discomfort sometimes associated with standard vitamin C supplements.*

Ultra Potent-C 1000 is formulated for daily use.* Your immune system faces ongoing demands, especially during periods of stress, so consistent daily intake can help support your body over time.

As with any supplement, consult your healthcare practitioner if you are pregnant, nursing, taking medication, or have a medical condition.

For 40+ years, Metagenics® has combined clinical science, rigorous testing, and practitioner expertise to create health supplements you can trust, and we guarantee that what’s on the label is what’s inside. Here’s what that commitment looks like:

• 200K+ quality tests yearly: We test for identity, quality, consistency, and strength across our products and ingredients.

• Triple-tested formulas: We test at the ingredient, formula, and finished product level for label claims and contaminants, including heavy metals and microorganisms.

• Independently verified: We voluntarily participate in TESTED by SuppCo, which anonymously buys and independently tests our products.

• High standards, inside & out: Produced in GMP-certified facilities and Certified B Corp for social and environmental accountability.

• Practitioner trusted: The #1 Doctor-Recommended Professional Supplement Brand★, trusted by 50K healthcare practitioners.

• Risk free: Backed by our 60-Day Money Back Guarantee.

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