What it is
Evidence basis: Human clinical evidence
At a glance
What it is, why people use it, the evidence, and what to know before trying it.
Safety & interactions
Known side effects, interactions and use limits from reviewed sources.
Excess vitamin D can cause hypercalcemia, kidney stones and tissue calcification. Total intake from all products matters, and high doses should be guided by clinical context and appropriate testing.
Seen in protocols
Public protocols that include Vitamin D3. Open one to see the full context and source.
Gary Brecka's Core Supplement StackImmune function, hormone production, and mood supportLongevity Supplement StackImmune, bone, mood supportDr. Mark Hyman's Core Supplement StackImmune function, metabolic health, hormone balance. Adjust based on blood levels.Dr. D'Agostino's Ketogenic Supplement StackImmune function, hormone supportDr. Gottfried's Supplement RecommendationsHormone precursor, mood, and bone healthSupplements selected after blood tests
Common dose and timing
Amount and timing patterns reported in public protocols; these are observations, not instructions. Private and hidden usage is excluded.
Typical amount
- 4,000-5,000 IU2 reports · 40%
- 10,000 IU1 report · 20%
- 2,000-5,000 IU1 report · 20%
- Based on blood levels1 report · 20%
Timing
- Daily4 reports · 80%
- Morning1 report · 20%
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