Skip to content
UKUSA
Life Extension Buffered C — non-daily serving
Product analysis · Life Extension

Life Extension Buffered C — non-daily serving

Buffered blend · Powder

Why this score?
Testing & evidence
3/25
Ingredient/formulation quality
8/20
Value
6/20
Dose context & clarity
4/15
Manufacturer transparency
9/10
Label/ingredient transparency
4/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing transparency: 3/25
£24.55Amazon
PowderFormat
4,000 mgDaily dose
454 gPack size
£0.29Price/day
Buy Now on Amazon Compare alternatives

We may earn a commission from qualifying purchases. This never affects our scores.

The score, explained

Our scoring methodology
Testing & evidence12.8/100
3 points contributed · weighting 25
Ingredient/formulation quality40/100
8 points contributed · weighting 20
Value32/100
6 points contributed · weighting 20
Dose context & clarity25/100
4 points contributed · weighting 15
Manufacturer transparency85/100
9 points contributed · weighting 10
Label/ingredient transparency40/100
4 points contributed · weighting 10

The score compares product data, not medical effectiveness or individual suitability. Prime and affiliate commission contribute no points.

Testing & evidence

Testing claimed

Evidence status
Testing claimed
Manufacturer statement
Amazon listing says: "HIGH QUALITY: Life Extension's vitamin C powder is tested for quality and purity in independent laboratories." Life Extension's own FAQ says its ingredients and final products are "verified using advanced analytical methods like high performance liquid chromatography and mass spectrometry" and that the company is "GMP registered with NSF International." I did not find an independently verifiable product-specific COA, lab report, or registry entry for this exact Buffered Vitamin C Powder.
Laboratory
Not recorded
Certification body
Not recorded
Batch
Not recorded
Batch-specific report
Not established in this record
Report date
Not recorded
Evidence checked
2026-09-14 09:30:38

Dose & value

Vitamin C form
Buffered blendPowder
Daily dose
4,000 mgHigh dose · GI context
Serving size
Serving or nutrient confirmation pending
Pack size
454 g
Servings per day
1
Price per day
£0.29
Price last checked
2026-09-12 18:28:57

Daily cost uses the recorded label serving; a larger dose earns no value advantage. The label serving is not a recommendation for your personal intake.

Vitamin C formulation details

Comparison form
Buffered blend
Chemical form as disclosed
Ascorbic acid with calcium, magnesium and potassium carbonates; zinc gluconate
Vitamin C / serving (mg)
4000
Vitamin C / day (mg)
4000
Label NRV / serving (%), if stated
Not disclosed
Pack size as labelled
454 g
Recommended serving / frequency
1 rounded teaspoon (5.4g) providing 4,000mg vitamin C, mixed into water; label does not state an explicit daily frequency beyond "start low, take with meals"
Comparison basis for a serving range
Not disclosed
Tablets, capsules, gummies, grams or ml / serving
5.4
Time-release claim (yes / no / unknown)
no
Liposomal claim (yes / no / unknown)
no
Bioflavonoids included / amount
Not listed
Rose hips included / amount
Not listed
Acerola included / amount
Not listed
Zinc included / amount
Yes · 2 mg per 5.4 g
Other active ingredients
Calcium 145 mg, magnesium 55 mg, zinc 2 mg, potassium 365 mg per 5.4 g
Sugars / sweeteners
None listed
Allergen statement
No separate allergen statement captured; check current pack
Vegan / vegetarian label status
Vegan claim on listing

Product sources & research notes

Listing and manufacturer details describe the label; they do not independently verify product claims. Check the current pack before use.

Ingredients & suitability

Vegan Vegetarian

Excipients
L-ascorbic acid, calcium carbonate, magnesium carbonate, zinc gluconate, potassium carbonate
Allergens
No separate allergen statement captured; check current pack
Carrier / source
Not disclosed — check the current label
Other active ingredients
Calcium 145 mg, magnesium 55 mg, zinc 2 mg, potassium 365 mg per 5.4 g

Manufacturer transparency

Brand
Life Extension
Legal company
Quality Supplements and Vitamins, Inc. (d/b/a Life Extension)
Manufacturing model
Not conclusively disclosed (mixed in-house/third-party)
Manufacturing location
United States (New Jersey facility referenced)

View the full brand profile →

What the record makes clear

  • Active amount is disclosed.
  • Daily cost can be calculated from the recorded serving.

What to keep in mind

  • Verify the current label and the batch covered by any testing report.
  • A product score cannot determine whether you need a supplement.

Explore the alternatives

Compare alternative

WeightWorld Vitamin C 1000mg

Why this score?
Testing & evidence
21/25
Ingredient/formulation quality
15/20
Value
18/20
Dose context & clarity
12/15
Manufacturer transparency
9/10
Label/ingredient transparency
9/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Verified independent evidence
Manufacturer statement
Attached to test report no. 26C22342 ... TESTING COMPLIANCE CERTIFICATE ... Sample description: WEIGHTWORLD VITAMIN C WITH ROSEHIP AND BIOFLAVONOIDS 1000 mg 180 TABLETS - BATCH CODE: 429140 ... The test report no. 26C22342 has been issued in compliance with the requirements of ISO/IEC 17025 ... Neotron Spa
Laboratory
Neotron Spa
Certification body
Not recorded
Batch
429140
Batch-specific report
Recorded
Report date
Not recorded
Evidence checked
2026-09-14 09:47:06
£0.05per day
£9.89per pack
View AnalysisBuy Nowon Amazon
Compare alternative

Alpha01 Acerola Vitamin C 80mg

Why this score?
Testing & evidence
20/25
Ingredient/formulation quality
15/20
Value
10/20
Dose context & clarity
14/15
Manufacturer transparency
9/10
Label/ingredient transparency
9/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Verified independent evidence
Manufacturer statement
Alpha01 product page shows a 'CERTIFICATIONS & LAB TESTS' section listing 'Heavy Metals Testing' and 'Microbial Contaminants Testing' for 'Organic Acerola Cherry 11,750mg - 90 Capsules'; the linked report reads 'Sample description: Alpha01 - Organic Acerola Cherry Capsules 11,750mg' and 'TEST REPORT NO 204565/26/RIG' from SIA 'J.S. HAMILTON Baltic' laboratory.
Laboratory
SIA "J.S. HAMILTON Baltic"
Certification body
Not recorded
Batch
LC001DR7U05/012029
Batch-specific report
Recorded
Report date
Not recorded
Evidence checked
2026-09-14 09:17:10
£0.10per day
£8.99per pack
View AnalysisBuy Nowon Amazon
Compare alternative

Solgar Ester-C Plus 500mg

Why this score?
Testing & evidence
21/25
Ingredient/formulation quality
15/20
Value
10/20
Dose context & clarity
12/15
Manufacturer transparency
9/10
Label/ingredient transparency
9/10
Displayed points and weights are rounded; the total uses unrounded weights. Pending dimensions are excluded. Provisional scores may change after review.
Testing evidence
Evidence status
Recognised certification
Manufacturer statement
Amazon listing image shows an NSF Certified Gluten-Free seal for this exact product, and NSF's own listings site has a matching product listing page (share-link?seq=MTQyNDE2) for Solgar Ester-C Plus 500 mg / 100 Vegetable Capsules.
Laboratory
Not recorded
Certification body
NSF International
Batch
Not recorded
Batch-specific report
Not established in this record
Report date
Not recorded
Evidence checked
2026-09-14 09:16:27
£0.12per day
£12.43per pack
View AnalysisBuy Nowon Amazon