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- # N1245
NOW Foods Calcium Carbonate Powder (12 oz / 340 g) – Pure Elemental Calcium for Strong Bones & Everyday Wellness
If you have ever tried taking standard calcium pills, you know how uncomfortably large and hard to swallow those "horse tablets" can be. NOW Foods Pure Calcium Carbonate Powder (Item #1245) solves this problem by delivering pure, unadulterated calcium in an ultra-fine, unflavored powder that mixes directly into juices, smoothies, and soft foods with zero binders or chemical fillers.
Calcium carbonate is recognized by clinical nutritionists for possessing the highest percentage of elemental calcium among standard dietary supplements—supplying roughly 40% pure calcium by weight (Straub, D. A., 2007, Nutrition in Clinical Practice, 22(3):286–296). By comparison, calcium citrate contains roughly 21% elemental calcium, calcium lactate delivers only 13%, and calcium gluconate provides just 9%. This concentrated potency means you only need a tiny serving—just 1/2 level teaspoon (1.7 grams)—to obtain a full 600 mg of bioavailable elemental calcium (46% of your daily value).
Whether you are looking to reinforce bone mineral density, preserve dental enamel, meet daily pregnancy calcium requirements, balance homemade whole-food canine diets, or calm an overactive, acidic stomach, this pure calcium powder provides clean, flexible dosing at an unbeatable cost per serving.
Key Product Highlights at a Glance:
- ✓High Elemental Yield: Delivers 600 mg of elemental calcium in just 1/2 level teaspoon.
- ✓100% Pure Powder: Zero magnesium stearate, stearic acid, silicon dioxide, artificial colors, or tablet binders.
- ✓Exceptional Value: Approximately 200 daily servings per 12 oz container.
- ✓Diet Friendly: Vegan, Vegetarian, Non-GMO, Gluten-Free, Soy-Free, Dairy-Free, and Kosher certified.
Mechanism of Action: How Calcium Carbonate Works in Your Body
To understand how calcium carbonate builds stronger bones and soothes digestive discomfort, it helps to look at the simple chemistry occurring inside your digestive tract and bloodstream:
1. Stomach Acid Dissolution (The Activation Step)
In its dry form, calcium carbonate (CaCO3) is an insoluble mineral salt. When you swallow it with a meal, your stomach pumps out hydrochloric acid (HCl). The acid immediately reacts with the powder: CaCO3 + 2 HCl → CaCl2 + H2O + CO2. This natural chemical reaction dissolves the solid mineral into free, ionized calcium (Ca2+) ions that your small intestine can effortlessly absorb into the bloodstream.
2. Why Food Is the Key to Peak Absorption
Because calcium carbonate relies on stomach acid to break apart, taking it on an empty stomach drastically lowers absorption. Groundbreaking research led by Dr. Robert R. Recker demonstrated that individuals with low stomach acid (achlorhydria) or those taking acid blockers absorb calcium carbonate normally when it is consumed alongside a meal (Recker, R. R., 1985, New England Journal of Medicine, 313(2):70–73). Food naturally prompts your stomach to produce digestive juices and slows gastric emptying, providing ample time for the mineral to solubilize completely (Heaney, R. P., et al., 2001, Journal of the American College of Nutrition, 20(3):239–246).
3. Cellular Transport & Bone Mineralization
Once dissolved, ionized calcium passes into the duodenum and jejunum. Here, vitamin D-dependent transport channels (TRPV6) and calbindin protein carriers pull calcium through the intestinal lining into circulation. Your body shuttles roughly 99% of its total calcium supply directly into skeletal bones and teeth, locking it into a resilient crystalline lattice known as hydroxyapatite. Adequate daily calcium intake, combined with vitamin D and regular weight-bearing activity, helps prevent your parathyroid glands from pulling calcium out of your skeleton, substantially reducing the risk of osteoporosis and fractures (Weaver, C. M., et al., 2016, Osteoporosis International, 27(1):367–376).
4. Fast-Acting Acid Neutralization
Because the carbonate base readily binds free hydrogen protons in the stomach, calcium carbonate rapidly neutralizes excess gastric acid within minutes of contact. This biochemical buffering raises stomach pH to a comfortable range, inactivating pepsin and offering immediate, soothing relief from occasional acid indigestion and heartburn (Voropaiev, M., et al., 2021, BMC Gastroenterology, 21:112).
Complete Supplement Facts & Verified Ingredients
Every batch of NOW Foods Calcium Carbonate Powder contains only one ingredient: pure, pharmaceutical-grade calcium carbonate. There are no flowing agents, anti-caking additives, flavorings, or preservatives.
| Nutrient Component | Amount Per 1/2 Level Tsp (1.7 g) | % Daily Value (DV) |
|---|---|---|
| Calcium (from Calcium Carbonate) | 600 mg | 46% |
| Total Calcium Carbonate Salt | 1,700 mg (1.7 g) | † Daily Value not established |
- Serving Size: 1/2 Level Teaspoon (approx. 1.7 g)
- Servings Per Container: About 200 servings (12 oz / 340 g)
- Other Ingredients: None.
- Allergen Free: Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish, tree nut, or sesame ingredients. Produced in an NPA-certified cGMP facility that processes other ingredients containing these allergens.
- Physical Attributes: Ultra-fine white odorless mineral powder, free from synthetic coatings or synthetic colorings.
NOW Foods Lab Purity: World-Class Screening & Heavy Metal Safety
Because calcium carbonate originates from earth-derived mineral deposits (such as refined natural limestone), unpurified or low-grade calcium products carry a substantial risk of environmental heavy metal contamination. Trace toxic elements like lead, arsenic, cadmium, and mercury naturally share geological strata with calcium. When choosing a daily calcium supplement, verified analytical testing is your strongest safety guarantee.
NOW Foods operates one of the most advanced private analytical laboratory facilities in the entire nutraceutical industry, located across two expansive facilities in Bloomingdale, Illinois, and Sparks, Nevada. Their quality control technicians run more than 16,000 to 19,000 independent analytical tests every single month on raw materials and finished lots.
How NOW Screens Calcium Carbonate for Absolute Safety:
- ✓ICP-MS Heavy Metal Analysis: NOW tests every raw incoming batch using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). This advanced instrumentation atomizes mineral samples at temperatures exceeding 10,000 Kelvin, detecting trace impurities down to parts-per-billion (ppb) levels for lead, cadmium, arsenic, and mercury.
- ✓Strict Prop 65 & USP Compliance: NOW adheres strictly to the United States Pharmacopeia (USP) chemical monographs and California Proposition 65 guidelines—enforcing internal lead thresholds far more stringent than standard federal requirements.
- ✓FTIR Identity Fingerprinting: Every batch is cross-referenced using Fourier Transform Infrared Spectroscopy (FTIR) to ensure 100% chemical identity and guarantee zero adulteration or filler dilution.
- ✓Microbiological Clearance: Thorough pathogen screens verify the absolute absence of Salmonella, Escherichia coli, yeast, mold, and total aerobic bacteria.
NOW's manufacturing facilities maintain Underwriters Laboratories (UL) cGMP registration, NPA "A"-rating compliance, and ISO/IEC 17025 laboratory accreditation, ensuring the powder inside your bottle is pure, safe, and true to label.
Suggested Usage, Mixing Tips, & Important Safety Precautions
Suggested Daily Intake: Adults take 1/2 level teaspoon (1.7 g) daily, preferably with a meal, or as directed by your healthcare professional.
The "Pulpy Juice" Mixing Secret
Because pure calcium carbonate is an earth mineral, it does not dissolve clear in plain tap water—it forms a chalky suspension that quickly settles to the bottom of the glass. For a smooth, grit-free experience, blend your 1/2 teaspoon into 6 to 8 ounces of pulpy liquids such as freshly squeezed orange juice, tomato juice, apple cider, or a daily breakfast fruit smoothie. The natural fruit acids (citric and malic acid) kickstart the dissolution process, while fruit pulp keeps the micro-fine powder evenly suspended.
The 500 mg Split-Dosing Rule for Maximum Absorption
Clinical pharmacokinetic studies prove that the human gut absorbs calcium most efficiently in single doses of 500 mg of elemental calcium or less (Institute of Medicine Committee to Review Dietary Reference Intakes for Vitamin D and Calcium, 2011). When single doses climb above 600 mg, the active intestinal transport pathways become saturated. If your doctor has recommended 1,000 mg to 1,200 mg of supplemental elemental calcium daily, take 1/2 level teaspoon with breakfast and a second 1/2 level teaspoon with dinner rather than taking it all at once.
Critical Precautions & Medication Timing
- Medication Interference: Calcium binds readily to certain pharmaceutical medications, drastically lowering their bioavailability. Separate your calcium intake by at least 2 to 4 hours from oral tetracycline/quinolone antibiotics, bisphosphonates (osteoporosis drugs), and thyroid hormone replacements (levothyroxine).
- Medical Conditions: If you are pregnant, nursing, taking prescription medications, or have a history of hypercalcemia, hypercalciuria, impaired kidney function, or kidney stones, consult your physician prior to supplementation.
- Storage: Natural color variation may occur in this product. Sold by weight, not volume. Store securely in a cool, dry place away from moisture after opening. Keep out of reach of children.
Why Purchase NOW Calcium Carbonate Powder From VitaNet Online?
In an era dominated by anonymous third-party online marketplace resellers, finding authentic, properly stored nutritional supplements backed by real human expertise can be challenging. VitaNet, LLC stands apart as an independent, family-owned American retailer dedicated to health and transparency[cite: 1].
- Serving Customers Online Since 1995: Founded over 31 years ago in Hartville, Ohio, VitaNet brings decades of hands-on dietary supplement industry experience and a practical understanding of human biochemistry directly to your doorstep[cite: 1].
- Guaranteed Direct Manufacturer Sourcing: Every container of NOW Foods Calcium Carbonate Powder in our warehouse arrives directly from authorized distribution, stored in climate-controlled conditions to protect freshness and potency[cite: 1].
- Deep Discount Everyday Pricing: We believe essential wellness should be affordable, offering everyday discounts of up to 50% off retail pricing across a catalog of over 16,000 name-brand vitamins and minerals[cite: 1].
- Unconditional 100% Money-Back Guarantee: We stand behind every product we sell. If you are unsatisfied for any reason, we offer a risk-free 100% money-back guarantee—and we even pay the return shipping costs, even on opened items[cite: 1].
- BBB A+ Accredited Trust: Backed by our long-standing Better Business Bureau A+ accreditation, you can shop with total confidence supported by dedicated customer service[cite: 1].
Frequently Asked Questions (FAQ)
What is the main difference between calcium carbonate and calcium citrate?
The biggest difference is elemental calcium concentration and stomach acid requirements. Calcium carbonate contains 40% elemental calcium by weight, requiring smaller powder servings, but requires stomach acid from a meal for optimal absorption (Straub, D. A., 2007). Calcium citrate contains only 21% elemental calcium (requiring larger physical doses), but dissolves without needing stomach acid, making it suitable for fasting consumption. When taken with food, both forms are effectively absorbed by the human body (Heaney, R. P., et al., 2001).