The short answer
Corrects inadequate calcium intake and is less dependent on stomach acid than calcium carbonate.
- Evidence and scope
- Established for an indicated use
This status does not grade the ingredient for every goal, outcome, or person.
- Important limitation
- The benefit is tied to the stated indication, dose, and population; it is not evidence of broader disease prevention or longer life.
- Before deciding
- Key concern: Separate thyroid medicine, iron, and some antibiotics; kidney stones and hypercalcemia require review.
01 / PRACTICAL GUIDE
Dose, absorption, and combinations
These are indication-specific reference or studied ranges—not a personalized prescription. Start with the objective, then check the form, label, medicines, and health conditions.
Reference or studied range—not a personalized prescription. The product label or a clinician may specify a different dose.
Dose source ↗More is not automatically better. A clinician or product label may specify a different amount.
Water-soluble or readily water-dispersible. This does not mean excess is always harmless.
May be taken with or without food; split larger totals.
Separate thyroid medicine, iron, and some antibiotics; kidney stones and hypercalcemia require review.
Dose and use links lead to primary or official source material. Search links are discovery tools, not proof that every returned paper applies.
02 / EVIDENCE
What the research says
We keep supportive, mixed, negative, safety, and contextual findings together. The headline never replaces the underlying papers.
These are audited counts for this JIVANA collection, not search-result totals. Participants are counted once when multiple papers use the same cohort; review papers are not added again to participant totals.
Open the research timelineResearch timeline+
Entries are ordered by publication year. A study period appears only when the source reports it.
Comparison of calcium citrate and calcium carbonate absorption after three types of bariatric surgery
Citrate produced slightly higher serum calcium exposure and peak levels, greater urinary calcium, and a larger PTH decline than carbonate. These short pharmacokinetic differences do not establish superior bone or fracture outcomes.
Study design and methods
- Design
- Randomized, double-blind crossover trial
- Population
- 150 adults after Roux-en-Y, sleeve, or one-anastomosis gastric bypass; 85% women
- Intervention
- Calcium citrate versus calcium carbonate
- Outcome
- Serum and urine calcium exposure and parathyroid-hormone response
Calcium Citrate Versus Calcium Carbonate in Chronic Hypoparathyroidism
Both forms maintained similar serum calcium and did not differ on the primary calcium-oxalate index. Citrate lowered urinary oxalate and caused less constipation, but the short study did not establish fewer kidney stones.
Study design and methods
- Design
- Randomized, double-blind crossover trial
- Population
- 24 adults with postsurgical chronic hypoparathyroidism
- Intervention
- Calcium citrate versus calcium carbonate
- Outcome
- Serum calcium, urinary stone-risk measures, quality of life, constipation, and adverse events
Comparison of the absorption of calcium carbonate and calcium citrate after Roux-en-Y gastric bypass
Citrate produced statistically higher serum calcium exposure and a stronger PTH response than carbonate. Absolute serum differences were small, the sample was tiny, and no clinical bone outcome was tested.
Study design and methods
- Design
- Randomized, double-blind crossover trial
- Population
- 19 gastric-bypass patients enrolled; 18 completed
- Intervention
- Calcium citrate versus calcium carbonate
- Outcome
- Serum and urine calcium and parathyroid-hormone response
Calcium absorption and achlorhydria
Fasting carbonate absorption was markedly impaired with achlorhydria, while citrate absorption was preserved. Taking carbonate with a normal breakfast restored absorption, so the result supports a meal and stomach-acid distinction rather than universal citrate superiority.
Study design and methods
- Design
- Double-isotope comparative absorption study
- Population
- 11 fasting patients with achlorhydria and 9 fasting controls
- Intervention
- 250 mg calcium carrier as pH-adjusted citrate or carbonate; carbonate was also tested with breakfast
- Outcome
- Fractional calcium absorption
Unscreened discovery appendix—not evidence135 candidate publicationsSearch run: Aug 21, 2026
Complete for the displayed PubMed query at the search timestamp—not for all databases or every possible synonym. Candidates can be irrelevant, duplicate the same study, or report negative findings. They are never summed as evidence or participants until screened.
03 / SOURCES
Start with the source material
The live search is for discovery only. Search-result counts change and are not included in the audited totals above.
Recent PubMed discovery recordsDirect links to the first 12 records returned by the reproducible search. These are discovery candidates—not reviewed summaries or a count of supportive findings.
- Effect of Calcium Citrate Versus Calcium Carbonate on Parathyroid Hormone Levels in Patients Undergoing Bariatric Surgery: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.Rahmani J, Baziar N, Malekpour Alamdari N et al. · 2026 · Obesity surgery · PMID 41806228Open on PubMed ↗
- Dietary interventions on nutritional management of population with urolithiasis: a systematic review of clinical evidence.Pacheco-Hernández B, Sansores-España D, Medina-Vera I et al. · 2025 · Nutrition research reviews · PMID 40936162Open on PubMed ↗
- Comparison of calcium citrate and calcium carbonate absorption in patients with a Roux-en-Y gastric bypass, sleeve gastrectomy, and one-anastomosis gastric bypass: a double-blind, randomized cross-over trial.Hany M, Wuyts S, Abouelnasr AA et al. · 2025 · Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery · PMID 39603923Open on PubMed ↗
- The Effect of Multi-Ingredient Protein versus Collagen Supplementation on Satellite Cell Properties in Males and Females.Wageh M, Fortino SA, Pontello R et al. · 2024 · Medicine and science in sports and exercise · PMID 39475860Open on PubMed ↗
- The efficacy of oral vitamin D supplements on fusion outcome in patients receiving elective lumbar spinal fusion-a randomized control trial.Hu MH, Tseng YK, Chung YH et al. · 2022 · BMC musculoskeletal disorders · PMID 36401234Open on PubMed ↗
- Changes in Urine Composition and Risk of Kidney Stone Disease Following Bariatric Surgery: A Systematic Review over Last 2 Decades.Gadiyar N, Geraghty RM, Premakumar Y et al. · 2022 · Current urology reports · PMID 36417046Open on PubMed ↗
- Calcium Citrate Versus Calcium Carbonate in the Management of Chronic Hypoparathyroidism: A Randomized, Double-Blind, Crossover Clinical Trial.Naciu AM, Tabacco G, Bilezikian JP et al. · 2022 · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · PMID 35466449Open on PubMed ↗
- Urate-lowering effect of calcium supplementation: Analyses of a randomized controlled trial.Cândido FG, Alves RDM, Freitas DMO et al. · 2022 · Clinical nutrition ESPEN · PMID 35623880Open on PubMed ↗
- Effect of high dose vitamin D supplementation on indices of sarcopenia and obesity assessed by DXA among older adults: A randomized controlled trial.Jabbour J, Rahme M, Mahfoud ZR et al. · 2022 · Endocrine · PMID 35028890Open on PubMed ↗
- Vitamin D3 Dose Requirement That Raises 25-Hydroxyvitamin D to Desirable Level in Overweight and Obese Elderly.Bacha DS, Rahme M, Al-Shaar L et al. · 2021 · The Journal of clinical endocrinology and metabolism · PMID 33954783Open on PubMed ↗
- The Effect of a Multi-ingredient Supplement on Resistance Training-induced Adaptations.Wageh M, Fortino SA, McGlory C et al. · 2021 · Medicine and science in sports and exercise · PMID 33756525Open on PubMed ↗
- Effect of Bacillius Coagulans and Galactomannans on Obese Patients Undergoing Sleeve Gastrectomy, A Randomized-Controlled Clinical Trial.Kazzi F, Daher N, Zimmerman G et al. · 2021 · Alternative therapies in health and medicine · PMID 29874199Open on PubMed ↗
04 / EXPERT CONTEXT
Expert context—not evidence
Expert positions are dated context—not scientific evidence. They never raise the evidence status or become consensus by repetition.
No direct, source-verified endorsement is currently recorded. Research authorship or discussion alone is not treated as endorsement.