Douglas Laboratories® - Calscorbplex (Buffered) - Vitamin C From Calcium Ascorbate, Magnesium Potassium and Zinc Ascorbates - 8 oz

Supplement facts

As a dietary supplement, adults take 1 teaspoon daily or as directed by your healthcare professional. Mix with water or juice.

Label data from the Dietary Supplement Label Database.

Label data as of 10 Sep 2026

50 / 100Fair

A clearly adequate vitamin C dose in a buffered mineral-ascorbate powder, but the labeled daily amount is twice the U.S. adult upper limit.

Score before rubric limits: 82.5 / 100.

Scoring criteria

Quantity
100 / 100
The 4,000 mg daily serving is ample for supplemental vitamin C; the excess over a reasonable supplemental amount is addressed under safety.
Form
85 / 100
Calcium and other mineral ascorbates are buffered, less acidic forms that may be better tolerated than plain ascorbic acid.
Convenience
100 / 100
The label directs one teaspoon daily; each 5.2 g serving is one measured powder portion.
Label accuracy
100 / 100
The matched label declares 4,000 mg vitamin C per 5.2 g serving and gives a consistent daily direction.
Purity
75 / 100
No other ingredients are listed, but no product-specific purity testing or controls are provided.
Cofactors
0 / 100
The listed minerals are components of the mineral ascorbate forms and are not declared as meaningful complementary ingredients.