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Medications · Energy & nutritional
High-Dose Vitamin D
Compounded vitamin D for deficiency and replacement protocols.
What it does
What High-Dose Vitamin D is and why doctors prescribe it.
Vitamin D (cholecalciferol or ergocalciferol) is a fat-soluble vitamin and pro-hormone. Doctors prescribe high-strength compounded preparations for deficiency repletion, as part of bone-health protocols, and in the context of the broader metabolic-health workup.
How it works
Mechanism in plain English.
Vitamin D is hydroxylated in the liver to 25-hydroxyvitamin D and then in the kidney to active 1,25-dihydroxyvitamin D (calcitriol), which binds the vitamin D receptor and regulates calcium homeostasis, bone mineralization, immune modulation, and many other pathways.
How long it's been studied
Research history.
Vitamin D was characterized in the 1920s-30s as the anti-rachitic factor. Modern research includes large randomized trials (VITAL, 2018) and decades of observational and mechanistic work. Compounded high-dose vitamin D is dispensed under 503A.
Dosing
Clinical context for the prescribing doctor.
Doctor-prescribed and lab-monitored. Compounded vitamin D is dispensed in oral capsule strengths from 5,000 IU daily up to 50,000 IU weekly for deficiency repletion. Your doctor monitors 25(OH)D levels and adjusts. Injectable D is used in select malabsorption contexts.
This page is informational, not a dispensing aid. High-Dose Vitamin D is dispensed only on a patient-specific prescription written by a licensed doctor for an identified patient. Compounded drugs are not FDA-approved and should not be evaluated using branded-drug trial data. Availability varies by state and prescribed medication.
How to access High-Dose Vitamin D through RonanRx
Three paths.
Doctors can prescribe compounded High-Dose Vitamin D for individual patients through RonanRx. Patients with a doctor can sign up to receive their prescription. Patients without a doctor can learn how the referral works.
Patient with a doctor
Sign up to receive your prescription.
If your doctor has already prescribed High-Dose Vitamin D, sign up so we can prepare and ship your medication. The signup wizard collects intake and connects you to the prescribing workflow.
Patient without a doctor
Get referred by a partner clinic.
RonanRx prescribes through partner clinics — we don't initiate prescriptions on this site. Read how the referral process works and how to find a partner clinic in your state.