Verdict
Not enough evidence
Vitamin D3 absorbs better when taken with a meal that contains fat.
2 sources: 2 positive
By Arun AgrahriLast reviewed
Short answer
With whichever meal has the most fat in it. Vitamin D is fat-soluble, so fat is what carries it across the gut wall, and Rhonda Patrick treats that as the rule that matters. Andrew Huberman ties morning dosing to the way daylight sets your body clock.
Vitamin D supplements are worth taking.
The verdict on Vitamin D overall. 12 sources: 6 positive, 6 partly
positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.
Vitamin D3 absorbs better when taken with a meal that contains fat.
2 sources: 2 positive. Fewer than 3 sources so far.
Researchers say
2 positive
Mark Hyman, 2 mentions on this claim
Positive Video
on The Dr. Hyman Show, at 40:26 · positive
“make sure you take it with food particularly fat which helps absorption”
on The Dr. Hyman Show, at 26:13 · positive
“make sure you take it with a food that has fat because that's how you'll absorb it”
Roger Seheult, on Rangan Chatterjee's channel, at 28:01
Positive Video · Opinion
Open the tape at 28:01 →“unless you're eating something that has some fatty food in it uh it's not going to get well absorbed”
Studies show
No study counted yet.
Mark Hyman Video · positive · 2 mentions
on The Dr. Hyman Show, at 40:26 · positive · Opinion
“make sure you take it with food particularly fat which helps absorption”
on The Dr. Hyman Show, at 26:13 · positive · Opinion
“make sure you take it with a food that has fat because that's how you'll absorb it”
Roger Seheult, on Rangan Chatterjee's channel, at 28:01 Video · positive · Opinion
“unless you're eating something that has some fatty food in it uh it's not going to get well absorbed”
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Vitamin D3 absorbs better when taken with a meal that contains fat. It is fat-soluble, and that one fact decides the timing. Rhonda Patrick returns to this point more than any other on dosing, because a capsule taken on an empty stomach delivers less than the label says.
Morning or midday suits the biology. Your body makes vitamin D from sunlight during daylight hours, and Andrew Huberman ties the timing to the same clock that light sets. If you take D3 with K2, as Mark Hyman does, nothing changes: both are fat-soluble and both want the same meal. Taking it every day matters more than the hour you pick.
No source on the record has ruled on night dosing. You will find the claim that late dosing disturbs sleep, but no one on the record makes it on tape, so it isn't repeated here.
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Full Vitamin D evidence report
The verdict on every claim, and where the sources disagree