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evidence · mechanism · dose
Supplements/Vitamin

Vitamin D3 (Repletion)

Repletion dose for deficiency under medical supervision.

Bone HealthImmune Function

Overview

Repletion dose for deficiency under medical supervision.

Natural sources
    Common forms

      Forms & variants of Vitamin D3

      Different chemical forms of Vitamin D3 behave differently. Browse each form's mechanism, bioavailability, and best-use context.

      Parent
      Vitamin D3

      Steroid hormone precursor regulating ~5% of the human genome — bone, immune, and hormonal health.

      D3 (Cholecalciferol)
      Vitamin D3 (Cholecalciferol)

      Preferred form for raising 25(OH)D — the active form your skin makes from sun.

      Maintenance 1000–2000 IU
      Vitamin D3 (Maintenance)

      Daily maintenance dose for non-deficient adults.

      Mechanism of action

      Saturates VDR signaling pathways to restore normal calcium homeostasis.

      Pathways

        Effects on the body

        Organ system effects

        Evidence-based benefits

        Corrects deficiency within 8 weeks

        Strong evidence

        Potential side effects

        Common
          Rare
          • · Hypercalcemia
          Serious
          • · Toxicity >150 ng/mL

          Drug interactions

          No notable interactions reported.

          Safety & non-supplemental interactions

          Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.

          Avoid with these conditions
          • ·Autoimmune disease (theoretical immune activation)
          Avoid / monitor with these medications
          • ·Immunosuppressants

          Supplement interactions

          Pairs well with

          None listed.

          Avoid combining with

          No specific avoidances listed.

          Dosing & bioavailability

          Typical dose
          5000 IU/day for 8 weeks, then maintenance
          With food?
          With fatty meal

          Where to buy

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          Thorne
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          Scientific evidence (8)

          CohortEndocr Pract · 2009

          High-dose vitamin D3 repletion

          Pepper KJ, et al.

          8-week repletion trial in deficient veterans.

          Key findings

          5000 IU/day raised levels into normal range.

          Open study
          Systematic reviewPubMed (NLM) · 1970

          PubMed: Vitamin D3 (Repletion) — Corrects deficiency within 8 weeks

          Live PubMed search

          Live results for "Vitamin D3 (Repletion) Corrects deficiency within 8 weeks" across the PubMed/MEDLINE peer-reviewed index.

          Key findings

          Opens current human and preclinical literature matching Vitamin D3 (Repletion) and "Corrects deficiency within 8 weeks". Filter by RCT, meta-analysis, or year on the results page.

          Open study
          Systematic reviewPubMed (NLM) · 1970

          PubMed: Vitamin D3 (Repletion) — randomized controlled trial

          Live PubMed search

          Live results for "Vitamin D3 (Repletion) randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

          Key findings

          Opens current human and preclinical literature matching Vitamin D3 (Repletion) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

          Open study
          Systematic reviewPubMed (NLM) · 1970

          PubMed: Vitamin D3 (Repletion) — meta-analysis

          Live PubMed search

          Live results for "Vitamin D3 (Repletion) meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

          Key findings

          Opens current human and preclinical literature matching Vitamin D3 (Repletion) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

          Open study
          Systematic reviewPubMed (NLM) · 1970

          PubMed: Vitamin D3 (Repletion) — pharmacokinetics

          Live PubMed search

          Live results for "Vitamin D3 (Repletion) pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

          Key findings

          Opens current human and preclinical literature matching Vitamin D3 (Repletion) and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

          Open study
          Systematic reviewPubMed (NLM) · 1970

          PubMed: Vitamin D3 (Repletion) — safety adverse events

          Live PubMed search

          Live results for "Vitamin D3 (Repletion) safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

          Key findings

          Opens current human and preclinical literature matching Vitamin D3 (Repletion) and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

          Open study
          Systematic reviewPubMed (NLM) · 1970

          PubMed: Vitamin D3 (Repletion) — dose response

          Live PubMed search

          Live results for "Vitamin D3 (Repletion) dose response" across the PubMed/MEDLINE peer-reviewed index.

          Key findings

          Opens current human and preclinical literature matching Vitamin D3 (Repletion) and "dose response". Filter by RCT, meta-analysis, or year on the results page.

          Open study
          Systematic reviewGoogle Scholar · 1970

          Google Scholar: Vitamin D3 (Repletion) — clinical evidence

          Live Scholar search

          Cross-database citation index for Vitamin D3 (Repletion) as it relates to "clinical evidence".

          Key findings

          Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

          Open study
          Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.