Oyster Shell Calcium + Magnesium + Vitamin D — Synergistic Mineral Support for Strong Bones & Muscles*
LifeSource Vitamins combines naturally derived oyster shell calcium (calcium carbonate) with essential magnesium and vitamin D₃ to support bone mineralization, calcium absorption, and healthy muscle function. Produced in GMP-certified facilities and
3rd-party tested
for identity, purity & potency.*
Research Promise:
At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is based on human studies verified by the
National Institutes of Health (NIH), a world-leading health authority, plus insights from 39 clinically respected organizations and 20 globally renowned health-focused universities.*
Clinically Studied Benefits (with research)
• Vitamin D Enables Calcium Absorption — Vitamin D promotes intestinal calcium absorption and maintains serum calcium for bone mineralization. (NIH/ODS — 2024)
• Calcium is Essential for Bone Structure & Function — Adequate calcium supports skeletal integrity; absorption occurs via active transport and diffusion. (NIH/ODS — 2024)
• Magnesium Supports Bone Formation & Vitamin D Metabolism — Magnesium influences osteoblast/osteoclast activity and vitamin D regulation; higher intakes correlate with better BMD. (NIH/ODS — 2024)
• Calcium + Vitamin D: Fracture Outcomes (WHI) — In the Women’s Health Initiative (36,282 women), Ca + D modestly improved hip BMD; hip-fracture reduction was not significant overall, with increased kidney-stone risk noted. (NIH/PubMed — Jackson 2006)
• Meta-Analysis: Ca + D Lowers Total & Hip Fractures — Pooled RCTs show 15% fewer total fractures and 30% fewer hip fractures with Ca + D versus control. (NIH/PMC — Weaver 2015)
• Clinical Guidance Nuances — USPSTF finds no net benefit for low-dose Ca ≤ 1,000 mg + D ≤ 400 IU for primary fracture prevention in community-dwelling older adults; dosing and population matter. (USPSTF — 2021)
• Marine-Source Calcium Viability — Reviews support marine-derived calcium (including shell sources) as a viable supplemental calcium form. (NIH/PMC — Fairweather-Tait 2020)
• Oyster-Shell Calcium in Deficiency — Oyster-shell calcium electrolysate improved serum calcium in vitamin D-deficient individuals. (NIH/PubMed — Reichel 1990)
• How to Take Calcium Carbonate — Calcium carbonate is best absorbed with food; small split doses (≤500 mg at a time) improve uptake. (Mayo Clinic — 2024)
• Bone-Health Basics & Dosing Context — Clinical guidance reiterates vitamin D’s role in calcium absorption and adult RDAs. (Mayo Clinic — 2024)
Additional Studies Showing Promising Benefits*
• May Reduce Long-Term Hip-Fracture Risk with Adherence — Long-term Ca + D in WHI subset analyses suggests potential hip-fracture risk reduction with adherence; kidney-stone risk increased. (NIH/PubMed — Prentice 2013)
• Ongoing NIH Communications Reinforce Trio’s Roles — Reinforces the roles of Ca, D, and Mg in bone health. (NIH/ODS — 2024)
• Population Data Link Magnesium to BMD — Higher magnesium intake correlates with better bone mineral density; small trials suggest bone-turnover effects. (NIH/ODS — 2024)
• Clinical Advice on Calcium Utility — Combine adequate intake, vitamin D status, and split dosing for best calcium utility. (Mayo Clinic — 2024)
• Regulatory Perspective on Low-Dose Ca+D — Low-dose Ca+D not effective for primary fracture prevention in general older-adult populations. (USPSTF — 2024)
• Quality Note on Lead Contamination — Some natural-source calcium supplements historically contained lead; rigorous testing is important. (NIH/PubMed — Ross 2000)
University Studies (Promising — Pre-Clinical / Early Human)*
• University of California, San Francisco — Early research on magnesium’s role in vitamin D metabolism. (NIH/ODS — 2024)
Global Evidence & Authoritative Reviews*
• WHO / NCCIH / EFSA / EMA / ABC / USP — Global reviews support the use of calcium, magnesium, and vitamin D for bone health and mineral balance.*
We monitor research from the world’s leading institutions — including Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge University, Oxford, Stanford, Yale, MIT, the University of Florida, Oregon State University – Linus Pauling Institute, Boston University, Cornell, Columbia, and Ohio State — to ensure our guidance remains aligned with the highest standards of credible science.*
Brief Benefit Bullets
• Helps build & maintain strong bones and teeth*
• Vitamin D supports calcium absorption & bone mineralization*
• Magnesium supports bone formation & muscle function*
• Synergistic mineral trio for daily skeletal wellness*
• Supports nerve conduction & normal muscle contraction*
• Calcium carbonate format—best taken with meals for absorption*
• Split-dose friendly (≤500 mg per serving) to optimize uptake*
• Marine-derived oyster shell calcium from a trusted source*
• 3rd-party lab tested for identity, potency & purity
Suggested Use
Adults take 2 Tabs daily with food and water, or as directed by your healthcare provider. For best absorption of calcium carbonate, take with meals and split larger daily amounts into two doses. If you have kidney disease or are on medications, consult your clinician.*
Product Specifications
• Form — Tabs
• Quantity — 100 Tabs per bottle
• Active Ingredients — Oyster shell calcium (carbonate), magnesium, vitamin D₃
• Free From — Gluten, dairy, soy, artificial colors/preservatives
• Quality — Third-party tested for identity, potency & purity
LifeSource Vitamins — Proudly American — Since 1992
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Oyster Shell Calcium + Magnesium + Vitamin D — supports bone health, calcium absorption, and muscle function; third-party tested quality. Clinically Studied Ingredients — NIH/PubMed!*
