Life Extension Buffered Vitamin C Powder, 454 Grams

Brand: Life Extension
Category: Vitamin C
Recorded price: $21.00; 7 Sep 2026
Price per serving: $0.25

Supplement facts

Serving size: 5.4 Gram(s)
Servings per container: 84

Ingredient	Amount per serving	% daily value
Vitamin C	4000 mg	4,444%
Calcium	145 mg	11%
Magnesium	55 mg	13%
Zinc	2 mg	18%
Potassium	365 mg	8%

Other ingredients

None

Directions on the label

Read the entire label and follow the directions carefully prior to use. Directions: Mix one (1) teaspoon of BUFFERED VITAMIN C POWDER into a glass of water. Wait for the fizz to stop before consuming. The minerals buffer out the normally acidic vitamin C to make a pleasant tasting drink.

Label data from the Dietary Supplement Label Database.

Label data as of 10 Sep 2026

Product score

50 / 100Fair

Category average: 83.2 / 100
Average for similar products: 60.6 / 100

A convenient buffered powder with a substantial vitamin C dose, but its fixed 4 g serving exceeds the adult upper limit and may cause gastrointestinal effects; the high dose is not needed for routine supplementation.

Score before rubric limits: 84.5 / 100.

Scoring criteria

Quantity
100 / 100
The fixed 4,000 mg vitamin C serving is ample for general supplementation; additional amount beyond a reasonable supplemental dose adds no quantity credit.
Form
85 / 100
Buffered mineral ascorbates are less acidic than plain ascorbic acid, offering a practical tolerability advantage, though the exact salt forms are not specified.
Convenience
100 / 100
The labelled routine is one teaspoon (one 5.4 g measured serving) once daily, providing 4,000 mg vitamin C; the 84 labelled servings give 84 daily portions.
Label accuracy
100 / 100
The high-confidence label gives consistent serving directions and amounts, with no established contradiction.
Purity
75 / 100
No product-specific contaminant or additive concern is shown, but no independent purity controls are identified.
Cofactors
0 / 100
The listed minerals are described as buffering components, not as separately established complementary nutrients for the stated purpose.