Pure Calcium Carbonate ⊘ Non-GMO Gluten-Free Vegan OU Kosher Certified - 400g/14oz
Labeled gluten-free with OU Kosher certification; no gluten-containing ingredients identified in the data.
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- Gluten-free labeling and vegan/non-GMO ingredients (OU Kosher certified; 100% calcium carbonate)
- Resealable packaging noted by a reviewer
- Versatile culinary uses in fermentation contexts (sourdough, pickles, posole)
- No explicit third-party gluten-free certification beyond OU Kosher
- Possible chalky taste if misused in beverages
Gluten safety details
Labeled gluten-free with OU Kosher certification; no gluten-containing ingredients identified in the data.
What to expect
A food-grade calcium carbonate powder intended for culinary use, available in a resealable package. It is gluten-free by labeling, non-GMO, vegan, and OU Kosher certified. Real-world uses include fermentation starter support, acidity/firmness adjustment in foods, and general culinary applications. Consumers report positive performance in fermentation contexts, with side notes about potential chalkiness if overdosed.
- Fermentation assistance (sourdough starter, pickles, posole)
- Acidity/firmness adjustment in food preparation
- Not described as a dietary supplement or calcium supplement with medical dosing guarantees
- Unclear cross-contact/facility details beyond functional claims
The full guide
What is Pure Calcium Carbonate?
Pure Calcium Carbonate is a 400 g container of 100% food-grade calcium carbonate from Modernist Pantry Store. It is labeled gluten-free, vegan, non-GMO, and OU Kosher certified, with ingredients listing only calcium carbonate. This powder is described as a culinary additive used to support fermentation and acidity management, and reviewers note a resealable package for easy storage.
Gluten safety and certifications
In gluten safety terms, the product carries gluten-free labeling and OU Kosher certification. The data does not show any GFCO or similar third-party gluten-free certification, and cross-contact or facility details are not provided. Realistic celiac or gluten-sensitive users should treat the information as a labeling basis, and consider their own sensitivities and brand transparency when choosing ingredients.
Use cases and what to expect
Common uses shared by reviewers include fermentation support such as sourdough starters, pickles, and posole, as well as acidity/firmness adjustment in various foods. Taste and texture notes indicate a chalky sensation if too much is used, and some reports mention chalkiness when used in beverages like coffee. Packaging is resealable, which helps with storage and dosing control.
Value, taste, and purchasing considerations
Price is listed at $14.99 for 400 g; price per ounce is around $1.07; the listing notes a mid-price tier and limited stock (e.g., six left in stock). This product is a culinary additive, not a medical supplement; vegan and non-GMO; organic certification is not shown; cross-contact and facility certification details are not provided beyond OU Kosher.
What shoppers say
💚 People liked
Resealable packaging
Perceived effectiveness in fermentation contexts
Versatility in uses (sourdough, pickles, posole)
⚠ People flagged
Chalky taste if used in excess (e.g., in coffee)
Key takeaways
- Gluten-free labeling and vegan/non-GMO ingredients with OU Kosher certification
- Resealable packaging and 400 g size support practical kitchen use
- Useful for fermentation and acidity control, but watch for chalkiness if overdosed
- GFCO or additional third-party gluten-free certifications are not evidenced in the provided data
Evidence gaps for this product:
- No explicit GFCO/NSF or other third-party gluten-free certifications evidenced beyond OU Kosher
- No details on manufacturing cross-contact controls or facility certifications
- No independent lab testing data provided in the supplied evidence
- No organic certification evidence