Vitamin D
Every recorded take from the experts Cited tracks — each with the exact quote, source, and timestamp.
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In a protocol
Sufficient vitamin D is one of the foundational supplements to reduce inflammation and support training adaptation.
“Vitamin D
HL▶ 1:35:00Certaintyexplicitrecommendation -
In a protocol
Supplementing vitamin D is generally safe and beneficial without major cross-reactions.
“Adding vitamin D, it's a very common one
TT▶ 3:31:00CaveatsWatch for heavy metals in low-quality sourcesCertaintyexplicitrecommendation -
Organic (prompted)
Maintain vitamin D in range; chronic deficiency increases dementia risk; pair with K and magnesium.
“low vitamin D levels chronically can increase dementia risk
BG▶ 45:40DosageCombined with K and magnesiumCertaintyexplicitrecommendation -
Organic (prompted) In a protocol
Vitamin D is among the basic supplements Bryan takes daily.
“basics like vitamin D and C
TD▶ 1:11:50Certaintypersonal onlyoffhand mention -
Adequate vitamin D synergizes with vitamin A to suppress Th17 cells and protect against autoimmune and allergic disease.
“vitamins A and D are powerful protectors against autoimmunity
MN▶ 12:50Certaintyexplicitstrong endorsement -
In a protocol
Vitamin D listed among key micronutrients needed to avoid deficiency-related dysfunction.
“B vitamins or vitamin D or omega-3 fats
TD▶ 15:35Certaintyexplicitrecommendation -
In a protocol
Supplement vitamin D and target serum levels of 60-100; many women are deficient.
“reaching a level of 60 to about 100
UW▶ 52:08Dosage2,000-4,000 IU/day maintenance; 50,000 IU loading dose if deficient; target serum 60-100Certaintyexplicitstrong endorsement -
Alternative
For people with mild cognitive impairment, 800 IU/day of vitamin D for a year was associated with cognitive improvements.
“800 IUs of vitamin D daily for a year, they had significant improvements
FO▶ 7:01Dosage800 IU per day for at least one yearCertaintyhedgedrecommendation -
Rhonda Patrick recommends vitamin D supplementation, typically 2,000–4,000 IU/day, to correct deficiency and reduce dementia risk.
“everyone should probably be supplementing with at least some vitamin D
FO▶ 1:30Dosage2,000–4,000 IU per day to maintain 25-hydroxyvitamin D blood levels between 30–60 ng/mL (sweet spot 40–60); avoid >80 ng/mLCaveatsTest 25-hydroxyvitamin D annually to ensure appropriate dosing; don't exceed 80 ng/mL.Certaintyexplicitstrong endorsement -
Sponsor read
Tim recommends adding a vitamin D supplement to daily routine because many are deficient, including himself.
“Many of us are deficient in vitamin D. I found that true for myself
TT▶ 3:20Certaintyexplicitrecommendation -
Tommy WoodEndorsesBen Greenfield LifeOrganic (prompted) In a protocol
Tommy supplements vitamin D in winter as part of brain-supportive nutrient strategy.
“vitamin D in the winter
BG▶ 55:40Certaintypersonal onlypersonal use -
Vonda WrightEndorsesThe Dr. Vonda ShowIn a protocol
Supplement vitamin D to maintain adequate blood levels needed for calcium absorption; check blood levels first.
“we do supplement that to keep our vitamin D level up
TD▶ 13:50DosageSupplement to reach healthy blood level; test vitamin D level via blood workCaveatsVitamin D supplementation alone does not build better bone — its role is enabling calcium absorptionCertaintyexplicitstrong endorsement -
Organic (prompted)
Cautions that 880–2000 IU vitamin D may cause brain fog in someone with marginal vitamin A status by biasing the calcium-phosphorus balance toward hypophosphatemia.
MN▶ 11:00Dosage880–2000 IU was symptomatic for this listenerCaveatsThis is case-specific; 2000 IU is reasonable for the average personCertaintyhedgedmild caution -
Supplemental vitamin D remains useful; Seneff's argument that only sun-derived vitamin D sulfate matters is not convincing enough to abandon supplementation.
MN▶ 22:20CaveatsSunlight has benefits beyond vitamin D that supplementation can't replicateCertaintyhedgedoffhand mention -
Attia discusses 2000 IU vitamin D as used in DO-HEALTH but notes it failed to move any aging clocks, possibly due to dose being too low.
“2000 IU of vitamin D is not going to do much
TP▶ 23:30Dosage2000 IU/day (as tested in DO-HEALTH)CaveatsDose may have been insufficient; 30% of participants had baseline <20 ng/dL.Certaintyhedgedoffhand mention