Vitamin D3 5000, 100 Softgels
BrainMD Vitamin D3 5000 delivers 5,000 IU of cholecalciferol (D3), the bioidentical form of vitamin D your skin synthesizes from sunlight.
May be a fit for
- Adults with limited sun exposure seeking D3 support
- Individuals maintaining healthy immune function with 5000 IU D3
- Those supporting mood and cognitive wellness with vitamin D3
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BrainMD Vitamin D3 5000 delivers 5,000 IU of cholecalciferol (D3), the bioidentical form of vitamin D your skin synthesizes from sunlight. It supports healthy immune function, bone mineral metabolism, and mood regulation, making it relevant for adults with limited sun exposure or those looking to maintain optimal 25(OH)D levels.
Why It's Worth Considering: BrainMD, founded by psychiatrist Dr. Daniel Amen, formulates with brain and nervous system health in mind; this D3 dose aligns with ranges commonly used in clinical practice for adults with documented insufficiency.
Product details
Who it may suit
May be a fit for
- Adults with limited sun exposure seeking D3 support
- Individuals maintaining healthy immune function with 5000 IU D3
- Those supporting mood and cognitive wellness with vitamin D3
- Active adults seeking higher-potency D3 for bone density maintenance
Considerations
- Hypercalcemia (elevated blood calcium)
- Sarcoidosis or other granulomatous diseases
- Severe kidney disease without medical supervision
- Taking thiazide diuretics (monitor calcium)
Compatibility & interactions
Works Well With
Take Separately From
No significant interactions identified. Always consult your healthcare provider.
What to expect over time
Serum Levels Rise
Measurable increase in 25(OH)D
Immune Support
Improved innate immune function
Mood & Energy
Reduced fatigue and improved mood
Optimal Range
Target 50-80 ng/mL achieved
Based on clinical studies on vitamin D3 supplementation. Response varies by baseline levels, body weight, and skin tone.
Compare the options
Compare Vitamin D Forms
D3 vs D2 vs D3+K2
| Feature | D3 (Cholecalciferol) | D2 (Ergocalciferol) | D3 + K2 Combo |
|---|---|---|---|
| Source | Animal (lanolin/lichen) | Plant/fungal | Animal + bacterial |
| Potency | 87% more effective at raising serum D | Baseline | Same as D3 + K2 synergy |
| Half-Life | ~2-3 weeks | ~2-3 days | ~2-3 weeks |
| Best For | General supplementation | Vegan-only option | Bone + cardiovascular health |
| Evidence | Strong (gold standard) | Moderate | Strong (synergistic) |
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A few useful answers.
Research & further reading
More category questions
How much vitamin D3 should I take daily?
Most functional medicine practitioners recommend 5,000 IU daily for adults with normal BMI, and up to 10,000 IU for those with obesity or severe deficiency. The Endocrine Society recommends maintaining serum 25(OH)D levels between 40-60 ng/mL. Test your levels every 3-6 months.
Is vitamin D3 better than D2?
Yes. D3 (cholecalciferol) is 87% more effective at raising and maintaining serum vitamin D levels compared to D2 (ergocalciferol). D3 also has a longer half-life. D2 is only preferred by strict vegans who cannot use lanolin-sourced D3 — lichen-based D3 is the vegan alternative.
Should I take vitamin D3 with vitamin K2?
Yes, especially at doses above 2,000 IU. Vitamin D3 increases calcium absorption from food. Without K2, that calcium can deposit in arteries instead of bones. K2 (MK-7 form) activates osteocalcin (puts calcium in bones) and matrix GLA protein (keeps calcium out of arteries).
Can I take too much vitamin D?
Toxicity is rare below 10,000 IU/day in healthy adults but possible with chronic high-dose use without monitoring. Symptoms of excess include hypercalcemia (nausea, kidney stones, confusion). Always pair high-dose D3 with K2 and test 25(OH)D levels every 3-6 months.
When is the best time to take vitamin D3?
Take with your largest meal containing fat — D3 is fat-soluble and absorption increases 30-50% when taken with dietary fat. Morning or afternoon is preferred over evening, as some studies suggest late-night D3 may interfere with melatonin production.
How long does it take for vitamin D levels to increase?
Serum 25(OH)D typically rises within 1-2 weeks of supplementation. Reaching optimal range (50-80 ng/mL) takes 2-3 months at 5,000 IU/day from a deficient baseline. Higher loading doses (10,000 IU for 8 weeks then maintenance) can accelerate this.
Supplement information is provided for education and is not a substitute for personalized medical advice. Supplements are not intended to diagnose, treat, cure or prevent disease. Read the current product label before use.