Vitamin D-3 125 mcg (5,000 IU) – 1 oz – Bone & Immune Support*
High-potency Vitamin D3 (cholecalciferol) to support strong bones, immune health, and overall vitality. Delicious citrus-flavored liquid delivers 5,000 IU per serving to help address deficiency and promote wellness. Produced in FDA-registered, GMP-certified facilities and 3rd-party tested for identity, potency & purity.*
Research-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. In addition, we reference reviews from leading health organizations and insights from top global universities to ensure our guidance aligns with credible science.*
Clinically Studied Benefits
✓ Supports calcium absorption & bone strength — RCTs show improved absorption.
NIH/PubMed — Shapses, 2013
✓ Helps prevent rickets & osteomalacia — Corrects mineralization defects.
NIH/PubMed — Griffin, 2021
✓ Supports immune function — Meta-analysis found modest protective effect against ARIs with daily dosing.
NIH/PubMed — Jolliffe, 2021
✓ Supports muscle strength & balance — Improvements in older adults.
NIH/PubMed — Qi, 2024
✓ Supports cardiovascular function — Subgroup trials suggest BP regulation.
NIH/PubMed — Zhang, 2020
✓ Supports mood balance — Meta-analysis shows small improvements in depressive symptoms.
NIH/PubMed — Wang, 2024
✓ Signals for lower cancer mortality — Reduced total cancer mortality in meta-analysis.
NIH/PubMed — Keum, 2019
Additional / Promising Evidence
✓ Vitamin D3 & insulin sensitivity — mixed trial outcomes.
NIH/PubMed — Pittas, 2019
✓ Vitamin D3 & blood pressure — generally null, possible subgroup benefit.
NIH/PubMed — 2021
✓ Vitamin D3 & autoimmune disease — reduced risk in large cohort.
NIH/PubMed — 2019
University-Led & Academic Studies
✓ Supports calcium absorption & bone strength — RCTs show improved absorption.
NIH/PubMed — Shapses, 2013
✓ Helps prevent rickets & osteomalacia — Corrects mineralization defects.
NIH/PubMed — Griffin, 2021
Global Evidence & Reviews
✓ NIH ODS — Vitamin D — Health-professional fact sheet on roles, deficiency, supplementation, and safety.
NIH/ODS — Vitamin D
✓ NCCIH — Vitamin D — Overview of uses, evidence, and safety considerations.
NIH/NCCIH — Vitamin D
We monitor research from leading institutions —
Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, Tufts, University of Florida, Oregon State University – Linus Pauling Institute, Columbia, Cornell, Ohio State — to align with credible science.*
Key Ingredients
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Vitamin D3 (cholecalciferol) — Supports calcium absorption, bone strength, immune function, muscle health, and mood; benefits strongest when levels are low. (NIH/ODS — Vitamin D)
Brief Benefit Bullets
- Supports bone health & calcium absorption*
- Supports immune function*
- Supports muscle strength & balance*
- Supports cardiovascular function*
- Supports mood balance*
- Signals for lower cancer mortality*
- Physician-supervised repletion for deficiency*
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3rd-party lab tested for identity, potency & purity
Suggested Use
1 Drop = 1,000 IU / 885 Servings; 5 Drops = 5,000 IU / 177 Servings; 10 Drops = 10,000 IU / 88 Servings. You control the dosage — 1,000 IU per single drop! Take as directed or with a meal containing healthy fats for absorption. If pregnant, nursing, taking medications, or have a medical condition, consult your physician.*
Product Specifications
• Serving Size — See dosage above
• Servings Per Container — Variable by dosage
• Form — Liquid (citrus flavor)
• Free From — Non-GMO, gluten-free, no artificial colors*
• 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.
Vitamin D3 5,000 IU Liquid — supports bone strength, immunity & mood; drop-dose control; 3rd-party tested. Clinically Studied Ingredients — NIH/PubMed!*
