vitamin
Vitamin D
TL;DR
Fat-soluble secosteroid vitamin synthesized in skin upon UVB exposure. Functions as a hormone affecting calcium homeostasis and bone health.
Overview
Fat-soluble secosteroid vitamin synthesized in skin upon UVB exposure. Functions as a hormone affecting calcium homeostasis and bone health.
116 / 565
products in our database contain Vitamin D
Source · MoodStack database
Compound forms
Vitamin D comes in several molecular forms. Each absorbs and acts differently.
Calcifediol (25-OH-D₃)
25-Hydroxycholecalciferol
Bioavailability
85%
Typical dose
—
D2
Ergocalciferol
Bioavailability
70%
Typical dose
600–4000 IU
D3
Cholecalciferol
Bioavailability
80%
Typical dose
600–4000 IU
Benefits
- Essential for calcium absorption and bone health
- Supports immune system function
- May reduce risk of autoimmune diseases
- Supports muscle function
- May improve mood and reduce depression risk
Dose guide
Common dose
600-800 IU daily
Typical range
600–4000 IU
Based on 116 products in our database.
Products with Vitamin D
Transparent Labs BULK Pre-Workout
Vitamin D3 + K2 Softgels
Glucosamine Chondroitin Complex with MSM + Vitamin D3
Transparent Labs Vitamin D3+K2
Basic Nutrients 2/Day
Transparent Labs BULK Black Pre-Workout
Transparent Labs Multivitamin
Calcium 600 mg with Vitamin D3
Calcium 600 mg with Vitamin D3 Tablets
Essential Multivitamin
Interactions
synergistic. D3 increases calcium absorption; K2 activates osteocalcin and MGP to direct calcium to bones, not arteries
synergistic. Magnesium required as cofactor for CYP enzymes converting 25-OH-D to active 1,25-OH2-D
synergistic. Vitamin D increases intestinal calcium absorption by 30-40%
enhances. Fat-soluble vitamin D requires dietary fat for absorption; omega-3 provides ideal co-administration
synergistic. Vitamin D upregulates zinc transporters; zinc required for vitamin D receptor function
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Medical disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any supplement regimen.