Now

NOW Foods Supplements

Calcium
Powder
Calcium
12 ounces

4.7/ 5 on Amazon2,600Amazon ratings2,000+bought last month4.5ProductDome score

Better rated than 63%
More reviewed than 61%

High confidenceLast refreshed Aug 4, 2026Amazon data + ProductDome analysis · methodology

Best forYou want a vegan, kosher, non-GMO calcium powder you can dose to your own serving size.

A straightforward calcium carbonate powder with vegan and kosher certification, best for those who prefer mixing their own dose over swallowing capsules.

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ProductDome scorecard

How it ranks among the 107 calcium we track

4.5/ 5ProductDome scoreHigh confidence

Owner satisfaction · 56% of scorecategory median 4.6★4.7

4.7★ across 2,600 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 1,800 ratings4.3

2,600 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score4.5

2,000+ bought on Amazon last month.

Data quality · 11% of score3.8

Brand identity, imagery, description and spec coverage.

The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 107 calcium we track - how the scorecard works · full calcium data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.

Overview

NOW Foods calcium carbonate powder in a 12-ounce container, unflavored, certified kosher and vegan, non-GMO, positioned for bone health support.

Powder calcium lets you measure your own serving instead of relying on a fixed capsule count, and calcium carbonate is the more concentrated elemental-calcium form compared with calcium citrate. NOW pairs it with kosher and vegan certification.

12 oz calcium carbonate powder
Kosher and vegan
Non-GMO
Marketed for bone health support

Who it's for

Vegans, vegetarians, and kosher-observant buyers who want a measurable calcium powder rather than capsules. Less suited to anyone who wants a pre-dosed capsule with no measuring involved.

Strengths and trade-offs

Drawn from this product's published specifications.

What stands out

Vegan and kosher certified
Powder form allows flexible dosing

What to check first

Requires measuring rather than a fixed capsule dose
Unflavored powder may have a chalky taste mixed into liquids
No magnesium or vitamin D listed alongside the calcium

Performance notes

Calcium carbonate depends on stomach acid for absorption, so it is typically taken alongside food rather than on an empty stomach.

Specifications

Brand	Now
Model	1245
Form	Powder
Supplement Type	Calcium
Count	12 ounces
Benefits	Bone Strength
Flavor	Unflavored
Diet	Kosher, Vegan
Allergens	Non-GMO

How it compares

This product against the closest alternatives we track in calcium.

Product	Amazon rating	Ratings	ProductDome score
NOW Foods SupplementsThis product	4.7 / 5	2,600	4.5 / 5
Nature Made Calcium Magnesium Zinc with Vitamin D3NATURE	4.8 / 5	19,900	4.7 / 5
Nature's Bounty Calcium Magnesium & Zinc CapletsNature's	4.7 / 5	23,000	4.6 / 5
Caltrate 600 Plus D3 Calcium and Vitamin D Supplement TabletsCaltrate	4.7 / 5	16,400	4.6 / 5
Citracal Slow Release- Calcium 1200 mg with Vitamin D3Citracal	4.7 / 5	11,909	4.6 / 5

Frequently asked

Questions about the Now 1245

Common buyer questions answered straight from the product spec data - no fluff, no "it depends".

Is NOW Foods Calcium Carbonate Powder vegan?

Yes, it is certified both vegan and kosher.

What size does it come in?

It is sold in a 12-ounce container of unflavored powder.

Does this powder include vitamin D?

The listed attributes only mention calcium carbonate; no added vitamin D or magnesium is specified.