21st Century Calcium Plus D3 Tablets
Amazon.comPosted 4 months ago
Our verdict
21st Century Calcium Plus D3 Tablets works out to $0.05 per serving of calcium, at 800IU per serving in tablet form. That puts it the cheapest quarter of the 98 calcium products we can price per dose, where the typical serving costs $0.15, a Value Index of 2.9 where the median product is 1.0. One container lasts 90 days at the label dose of 1 serving a day, about $1.50 a month. We could not verify a third-party certification for 21st Century in a public registry. Worked out from the current retail price as of 2026-11-13; confirm the live price on Amazon.com before buying.
Questions about this product
- How much does one serving of 21st Century Calcium Plus D3 Tablets cost?
- $0.05 per serving, which is 800IU of calcium in tablet form, against a typical $0.15 across the 98 calcium products we can price per dose, a Value Index of 2.9 where the median product is 1.0. Worked out from the current retail price as of 2026-11-13, not the sticker price.
- How long does one container of 21st Century Calcium Plus D3 Tablets last?
- 90 days at the label dose of 1 serving a day, which is about $1.50 a month.
- Is 21st Century third-party tested?
- We could not verify a certification for 21st Century in the USP, NSF or Informed-Sport public registries. We do not count a "lab tested" claim printed on a label as third-party testing, and an uncertified brand is not automatically worse.
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The silence is deafening
Lead with cost-per-dose, not vibes.