Vitamin D3 Injection (Cholecalciferol (Vitamin D3) Injectable)
High-dose injectable vitamin D3 for rapid repletion of deficiency. Telemedicine clinics prescribe it for immune optimization, bone health, and hormone support. Injectable form is ideal for malabsorption patients.
How it works
Converts to 25-hydroxyvitamin D then to active 1,25-dihydroxyvitamin D. Modulates over 200 genes including those for immune function, calcium absorption, bone remodeling, and hormone production.
Key facts
- Molecular weight: 384.64 Da
- Half-life: ~15 days (storage form)
- Bioavailability: ~100% IM
- Storage: Room temperature, protect from light.
Dosing overview
- Typical dose: 50,000-100,000 IU
- Frequency: Weekly to monthly
- Duration: Until optimal levels achieved
- Route: Intramuscular injection
Protocol notes
- For correcting deficiency, a high-dose IM bolus (50,000-100,000 IU) is given weekly or monthly until levels normalize.
- After repletion, most switch to a maintenance schedule (less frequent injections or daily oral D3).
- Co-supplementing vitamin K2 and magnesium is common to direct calcium appropriately.
Reported benefits
- Rapid deficiency correction
- Immune system optimization
- Bone health
- Hormone support
- Mood improvement
- Reduced inflammation
Possible side effects
- Injection site pain
- Hypercalcemia (overdose)
- Nausea
- Kidney stones (rare)
Research
- IM vitamin D3 vs oral supplementation (2021): Single IM injection of 100,000 IU achieved therapeutic levels 3x faster than daily oral supplementation in deficient patients.
Community reviews of Vitamin D3 Injection
- peptide_sarah rated it 5/5 - Solid compound with real results: Been using Vitamin D3 Injection for about 3 weeks and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
- subq_samantha rated it 4/5 - Noticed clear benefits within weeks: Added Vitamin D3 Injection to my protocol about 6 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
- syringe_science_sue rated it 5/5 - Worth adding to the protocol: Vitamin D3 Injection has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you want.
- loading_phase_lucy rated it 4/5 - Genuinely effective after 2 months: Been using Vitamin D3 Injection for about 2 months and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
- loading_phase_lucy rated it 5/5 - Consistent improvement over 4 months: Added Vitamin D3 Injection to my protocol about 4 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
- reid_f rated it 4/5 - winter blood levels finally normal after years low: living up here in the midwest with basically no sun october through march, my vitamin D always came back low no matter what I took orally. did the injection every few months for about six months and my next bloodwork was actually in range. that was the whole win for me.
Compare Vitamin D3 Injection
Research and educational reference only. Not medical advice.