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NOW Foods Pure Calcium Citrate Powder (8 oz / 227 g) – High-Absorption Elemental Bone Support
CALCIUM CITRATE Powder offers an ultra-pure, bioavailable mineral solution designed for maximum cellular absorption without gastrointestinal distress. Traditional calcium supplements frequently come in massive, hard-to-swallow “horse pills” formulated with chalky calcium carbonate. In contrast, NOW® Calcium Citrate Pure Powder delivers 600 mg of elemental calcium per serving in an unadulterated, free-flowing powder that contains zero fillers, zero binders, and zero artificial excipients.
Whether you are an older adult experiencing reduced stomach acid, someone using acid-blocking medications (such as PPIs or H2 blockers), an individual who has undergone bariatric surgery, or simply seeking an easier way to meet your daily bone density requirements, calcium citrate provides an optimal nutritional format. Because citric acid is already bound to the calcium ion, this powder dissolves smoothly and absorbs reliably with or without meals.
- ✓Optimal Bioavailability: Absorbs significantly better than calcium carbonate on an empty stomach and does not depend on strong gastric acid (Sakhaee et al., Am J Ther, 1999).
- ✓100% Pure Elemental Nutrition: Delivers 600 mg of elemental calcium per 1 ½ level teaspoons (from 3,000 mg pure calcium citrate) with zero inactive additives.
- ✓Gentle on Digestion: Greatly minimizes the bloating, gas, and constipation commonly triggered by sedimentary limestone or oyster shell supplements.
- ✓Complete Dosing Versatility: Eliminates pill dysphagia completely; effortlessly blends into thick liquids, smoothies, yogurt, or fresh juices.
Mechanism of Action: How Calcium Citrate Works in the Body
Calcium is the most abundant essential mineral in the human body, serving as the structural bedrock for bones and teeth while regulating muscular contraction, vascular constriction, nerve impulse transmission, and enzymatic signaling. However, dietary calcium cannot support these processes until it is dissociated into free ionized calcium (Ca2+) within the gastrointestinal tract.
1. Gastric Acid Independence (Solubility at Neutral pH): Conventional calcium carbonate requires strong hydrochloric acid (HCl) in the stomach to break its chemical bonds. When gastric acidity is low—a condition known as hypochlorhydria, common in aging adults and regular users of proton-pump inhibitors (PPIs)—fractional absorption of calcium carbonate plummets to under 5% (Recker, N Engl J Med, 1985). In contrast, Calcium Citrate is an organic salt complexed with citric acid. It possesses an acidic molecular structure that dissolves readily in neutral or slightly alkaline environments (pH > 5.0), ensuring reliable absorption throughout the upper small intestine regardless of digestive acid levels (Heaney et al., J Am Coll Nutr, 2001).
2. Dual-Pathway Intestinal Absorption: Once dissolved, ionized calcium enters the bloodstream via two distinct physiological mechanisms:
- Active Transcellular Transport: Concentrated in the duodenum and upper jejunum, this pathway uses specialized calcium channel proteins (TRPV6) and calbindin-D9k, activated by 1,25-dihydroxyvitamin D (calcitriol). This active system saturates at approximately 500 mg to 600 mg of elemental calcium at any single time.
- Passive Paracellular Diffusion: Operating throughout the entire length of the jejunum and ileum, calcium ions passively cross tight junctions between intestinal cells down an electrochemical concentration gradient.
3. Bone Remodeling & Parathyroid Balance: When circulating serum calcium drops, the parathyroid glands secrete Parathyroid Hormone (PTH), prompting osteoclasts to dissolve hydroxyapatite crystals in bone tissue to stabilize blood levels. Daily intake of bioavailable calcium citrate preserves bone mineral density by suppressing excess PTH secretion, preventing skeletal calcium breakdown, and maintaining structural bone mineralization (NIH Office of Dietary Supplements, Calcium Fact Sheet).
4. Renal Safety and Urinary Citrate Excretion: A common concern with mineral supplementation is the risk of calcium oxalate kidney stones. Research indicates that the citrate ion in calcium citrate acts as a natural stone inhibitor. Citrate binds to urinary calcium, lowering the saturation of calcium oxalate salts and alkalizing urine, which makes calcium citrate far less prone to stone formation than inorganic forms (Pak et al., J Urol, 1987).
Supplement Facts & Complete Ingredient Disclosure
NOW® Calcium Citrate Pure Powder is manufactured with complete label transparency. It contains zero synthetic flow agents, silicon dioxide, magnesium stearate, artificial flavorings, or preservatives.
| Supplement Facts | Amount Per Serving | % Daily Value |
|---|---|---|
| Serving Size: 1 ½ Level Teaspoons (approx. 3 g) | Servings Per Container: about 76 | ||
| Calcium (elemental) (from 3,000 mg Calcium Citrate) |
600 mg | 46% |
| Other Ingredients: None. | — | — |
Allergen & Manufacturing Information: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut, or sesame ingredients. Produced in a certified Good Manufacturing Practice (GMP) facility that handles other products containing these allergens.
Dietary Suitability: 100% Vegan & Vegetarian, Non-GMO Assured, Keto-Friendly, Kosher, Halal, Sugar-Free, Dairy-Free, and Free of Corn, Yeast, and Artificial Preservatives.
NOW Foods Lab Purity Standards & Heavy Metal Safety Verification
Mineral supplements derived from mined rock, coral, or geological limestone carry inherent risks of heavy metal contamination. Trace toxic elements like lead, cadmium, arsenic, and mercury naturally bind to calcium veins in the earth's crust. If a supplement manufacturer fails to execute rigorous analytical screening, these dangerous neurotoxins can pass directly to the consumer.
NOW Foods sets an industry benchmark for contaminant constraints, testing every raw material lot using one of the most sophisticated privately owned analytical testing networks in North America:
- ✓ICP-MS Heavy Metal Quantification: NOW utilizes Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and ICP-OES to detect toxic elements down to parts-per-billion (ppb). Every batch of calcium citrate powder is screened to ensure lead, mercury, cadmium, and arsenic levels meet strict USP safety limits and California Proposition 65 tolerances (less than 0.5 mcg/day of lead).
- ✓FTIR Raw Material Identity Testing: Fourier-Transform Infrared Spectroscopy (FTIR) creates a precise molecular fingerprint of incoming powders, validating that every grain is true 100% pure calcium citrate without adulteration or cheaper mineral substitutes.
- ✓Microbiological Purity Screening: High-throughput automated screening guarantees the total absence of microbial pathogens, verifying that batches are clean of Salmonella, E. coli, Staphylococcus aureus, coliforms, yeast, and molds.
- ✓ISO/IEC 17025 Accredited In-House Laboratories: NOW's internal testing facilities in Bloomingdale, Illinois, and Sparks, Nevada, operate under international ISO/IEC 17025 laboratory accreditation, staffed by over 150 chemists, toxicologists, and microbiologists.
Furthermore, NOW® manufacturing facilities maintain third-party GMP certification through Eurofins Healthcare Assurance under the rigorous NSF/ANSI 455-2 dietary supplement standards, alongside Underwriters Laboratories (UL) benchmark verifications.
Usage Guidelines, Mixing Tips & Clinical Precautions
Suggested Use: As a dietary supplement, take 1 ½ level teaspoons daily with a meal, or use as recommended by your physician or healthcare practitioner.
How to Mix for Best Results: Pure calcium citrate is a dense mineral powder rather than an artificial effervescent drink. Stirring it into plain cold water can result in the powder settling toward the bottom of the glass. For a smooth texture, blend your serving into dense or pulpy beverages such as orange juice, tomato juice, tart cherry juice, or protein smoothies. It also incorporates seamlessly when whisked into applesauce, oatmeal, or plain Greek yogurt.
Absorption Optimization Tip: Because human intestinal receptors for active calcium transport saturate around 500 mg to 600 mg of elemental calcium at one time, taking more than 600 mg in a single serving reduces fractional absorption efficiency. If you require higher supplemental amounts, divide your daily intake into two doses taken at separate meals (for example, ¾ teaspoon in the morning and ¾ teaspoon with dinner) (Heaney et al., Osteoporos Int, 1999).
Critical Medication Timing & Clinical Precautions:
- Thyroid Medications (Levothyroxine / Synthroid): Calcium binds to thyroid hormone in the gut lumen, drastically lowering drug absorption. Take calcium citrate at least 4 hours before or after your thyroid medication (Liwanpo & Hershman, Thyroid, 2009).
- Antibiotics (Fluoroquinolones & Tetracyclines): Divalent calcium ions chelate antibiotics such as ciprofloxacin and doxycycline, reducing their efficacy. Separate administration by at least 2 to 4 hours.
- Supplemental Iron: Calcium competes directly with non-heme iron for the divalent metal transporter 1 (DMT1) in the intestine. Take iron supplements at a separate meal (Hallberg, Am J Clin Nutr, 1998).
- Medical Consultation: For adult use only. If you are pregnant, nursing, taking prescription medications, or have a history of hypercalcemia, hyperparathyroidism, or severe kidney disease, consult your healthcare provider prior to use. Keep out of reach of children. Do not eat the enclosed freshness packet. Store in a cool, dry place after opening.
Why Order NOW Calcium Citrate Powder from VitaNet®, LLC?
When shopping for health supplements online, where you purchase is just as vital as the brand you choose. Third-party multi-seller marketplaces regularly struggle with unregulated third-party resellers, counterfeit stock, expired lots, and improper warehouse heat exposure that degrades supplement potency.
VitaNet®, LLC is an independent, family-owned American nutritional retailer serving health-conscious shoppers online since 1995[cite: 1]. With over 31 years of dedicated industry experience, we bring deep operational expertise, high product integrity, and personalized customer care to every single order[cite: 1].
- ✓Guaranteed Manufacturer Authenticity: Every bottle of NOW® Calcium Citrate Powder is sourced directly through verified distribution channels, stored in our climate-regulated Hartville, Ohio warehouse, and shipped with recent lot dates for peak potency[cite: 1].
- ✓Unconditional 100% Money-Back Guarantee: We stand fully behind everything we sell. VitaNet offers a comprehensive 100% money-back guarantee on all products and even covers return shipping costs—even on opened items[cite: 1]!
- ✓BBB A+ Accredited Independent Business: Unlike anonymous drop-shippers, VitaNet is an accredited Better Business Bureau A+ retailer with genuine phone support and knowledgeable customer service[cite: 1].
- ✓Everyday Volume Discount Pricing: Access thousands of brand-name natural wellness products at everyday discount savings up to 50% off MSRP without subscription traps[cite: 1].
Frequently Asked Questions (FAQ)
What is the practical difference between calcium citrate and calcium carbonate?
Calcium carbonate is an alkaline inorganic mineral salt (limestone) that contains 40% elemental calcium by weight but requires substantial stomach acid to dissolve and absorb. Calcium citrate is an organic calcium salt complexed with citric acid providing 20% to 21% elemental calcium by weight. Clinical trials show calcium citrate absorbs 22% to 27% better than calcium carbonate on an empty stomach and is absorbed smoothly even in individuals with low stomach acid, without causing gas, bloating, or acid rebound.