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Kirkland Signature Vitamin C 1000mg
SPECIMEN #KIRKLAND
Verified
VITAMIN_CKirkland Signature

Vitamin C 1000mg

The Honda Civic of vitamin C. 500 tablets, USP Verified, under $15 at Costco. Less than 3 cents per day. No fancy delivery system, no Instagram marketing. Just reliable vitamin C that does the job for a year and a half.

7.0/10
VERY GOOD

500 tablets for under $15 at Costco. Simple, USP verified, and does exactly what it says. The best vitamin C is the one you actually take daily.

2 ingredientsTablets500 servings
We'd recommend this
Evidence
7.0
Dosing
8.0
Synergy
4.0
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Whenmorning

Consistent daily dosing matters most.

Foodwith food

Reduces potential stomach irritation from ascorbic acid.

SafetyAll clear

High-dose vitamin C may cause GI discomfort in some people. Split into 500mg twice daily if needed.

ResearchStrong evidence

Ascorbic acid at 1000mg is one of the most studied supplement doses in existence.

What We Like

  • 500 tablets = nearly 1.5 years supply.
  • USP Verified quality.
  • 1000mg is a solid daily dose.
  • Pennies per serving.

Watch Out For

  • Basic ascorbic acid (no enhanced absorption form).
  • Rose hips at 25mg is negligible.
  • Large tablet can be hard to swallow.
  • No bioflavonoids for enhanced utilization.

What We Analyzed

Vitamin C 1000mg Supplement Facts

Verified Supplement Facts

Every dose checked against clinical research

We analyzed the actual supplement facts panel for this product. Every ingredient dose below was cross-referenced with published clinical trials to determine if it matches what studies actually use.

2 ingredients analyzed1 underdosed

Source: Official product page

Ingredient Breakdown

1 underdosed
Clinical Adequate Underdosed Overdosed|Bar = % of clinical dose
IngredientDoseStatusvs. Clinical
Vitamin C10.0

Ascorbic Acid

1000 mgOVERDOSED
200%
1000 mg

of 500mg

OVERDOSED
200%
Rose Hips
25 mgUNDERDOSED
1%
25 mg

of 2500mg

UNDERDOSED
1%
In our database (click to learn more) Not yet reviewed

Our Analysis

Best For

Everyone wanting affordable daily vitamin C.Costco members.Budget-conscious immune support seekers.

Skip This If

People with kidney stone history (high-dose C may increase oxalate).Those who can't swallow large tablets.

Time to Feel

1-2 weeks for immune support

Value

EXCELLENT

How to take: No cycling needed. Year-round daily use.

Personalized Deep Analysis

See exactly how this fits your health profile. What works for you, what doesn't, and whether you're getting your money's worth.

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