Vitamin D3
vitamins · The sunshine vitamin
Vitamin D3 is a fat-soluble vitamin critical for immune function, bone health, and mood regulation. Most people are deficient due to indoor lifestyles.
⏱️ Timing & dosage for Vitamin D3
Morning with food — fat-soluble, requires dietary fat
2,000–5,000 IU daily. Test blood levels, aim for 50–80 ng/mL.
✅ Benefits of Vitamin D3
- •Immune system support
- •Bone density & calcium absorption
- •Mood & depression reduction
- •Cardiovascular health
- •Insulin sensitivity
⚠️ Side effects & risks
- •Toxicity at very high doses (>10,000 IU/day)
- •May raise calcium if taken without K2
🔗 Vitamin D3 interactions
D3 increases how much calcium you absorb, and K2 directs that calcium into bone rather than soft tissue. They are commonly taken together for exactly this reason.
Magnesium is a cofactor for the enzymes that convert vitamin D into its active form, so low magnesium can blunt the benefit of supplementing D3.
Vitamin D drives calcium absorption. If you supplement calcium, D3 is what makes it usable.
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