21st Century Calcium 500mg + Vitamin D3 Tablets, Bone Health, 400 Count

Brand: 21st Century
Category: Calcium
Recorded price: $11.54; 5 Sep 2026
Price per serving: $0.06

Supplement facts

Serving size: 1 Tablet(s)
Servings per container: 200

Ingredient	Amount per serving	% daily value
Vitamin D3	5 mcg	25%
Calcium	500 mg	38%

Other ingredients

Maltodextrin
Cellulose
FD&C Blue #1
FD&C Yellow #5
Croscarmellose Sodium
Hydroxypropyl Methylcellulose
Magnesium Silicate
Magnesium Stearate
Polyethylene Glycol
Polyvinyl Alcohol
Stearic Acid
Titanium Dioxide

Directions on the label

Directions: As a calcium supplement, adults take one (1) tablet with any meal, twice daily or as directed by a healthcare provider.

Label data from the Dietary Supplement Label Database.

Label data as of 6 Sep 2026

Product score

86.4 / 100Excellent

Category average: 77.6 / 100
Average for similar products: 88.6 / 100

A straightforward calcium supplement with a useful 1,000 mg daily routine and a modest amount of supporting vitamin D3; the listed 400-count package does not clearly reconcile with the panel's 200 one-tablet servings.

Scoring criteria

Quantity
100 / 100
The labeled routine supplies 1,000 mg of calcium daily, a reasonable supplemental amount for the stated bone-health role.
Form
75 / 100
Oyster-shell calcium is a conventional calcium source, typically carbonate; taking it with meals suits carbonate's meal-dependent absorption, with no established premium advantage.
Convenience
76.5 / 100
The directions call for one tablet twice daily, so the evaluated routine is two tablets per day; the package title lists 400 tablets.
Label accuracy
75 / 100
The active amounts are stated per tablet, but 400 listed tablets do not match 200 one-tablet servings unless the listing is a multipack.
Purity
75 / 100
No product-specific contaminant or quality defect is shown; ordinary excipients and no named certification leave product quality unverified.
Cofactors
50 / 100
Vitamin D3 supplies 10 mcg daily and has a complementary role in calcium absorption, though the added benefit for this specific routine is uncertain.