Deeply pigmented skin can need up to six times longer in the sun to produce the same vitamin D as pale skin. blackd is a D3 complex enhanced with K2 and magnesium — one capsule a day, dosed for melanin-rich skin.
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Deficiency rarely announces itself. It shows up as the version of you that's running at 50%.
The science
Your skin is doing its job. It just needs a different route to vitamin D.
The science
Your skin is doing its job. It just needs a different route to vitamin D.
The mechanism is simple: more melanin, less synthesis.
Melanin absorbs UVB before it can trigger vitamin D synthesis in the skin.
Black adults are the group most likely to test below sufficient vitamin D levels.
Oral D3 skips the skin entirely — you dose it instead of waiting on sunlight.
blackd isn't a general multivitamin. It's one dose, built for one job, for the men the standard advice left out.
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Generic 1,000 IU tablets were dosed against an average that never included you. We start where the research on darker skin actually lands.
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5,000 IU of D3 with K2 MK-7 and magnesium — the two cofactors that help your body direct vitamin D to bone and muscle instead of leaving it idle.
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From October to April, the sun sits too low to help anyone at northern latitudes. One capsule a day keeps your intake constant when daylight isn't.
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blackd · clinical intent
We don't ask you to feel a difference and guess. We ask you to test, take one capsule a day for 90 days, and test again.
Self-reported results from 1,240 blackd customers who retested after 12 weeks.
Moved from insufficient into the sufficient range within 90 days
Reported steadier daily energy and fewer flat mornings
Said they'd keep taking it through the winter months
These statements have not been evaluated by the FDA. Not intended to diagnose, treat, cure or prevent any disease.
blackd · formulation
Our formula was built with clinicians and nutrition researchers who study vitamin D status in melanin-rich populations — then tested by an accredited third-party lab, batch by batch.
Third-party tested, every batch
cGMP-certified US facility
MD & PhD advisory review
"When I test Black patients in winter, insufficiency is the rule, not the exception. A 5,000 IU D3 with K2 and magnesium is exactly the kind of straightforward, honest formulation I want to be able to recommend."
Before-and-after 25(OH)D blood levels, self-reported by verified blackd customers after 90 days.
Andre W., 34
Flat by 2pm
Steadier energy across the afternoon
Fewer second coffees
"I assumed being tired at 34 was just work. My doctor ran a panel, I was at 17. Three months on blackd and the afternoon crash is basically gone."
Terrence J., 41
Office job, no sun
Easier mornings without an alarm fight
Back to training four days a week
"I leave for work in the dark and come home in the dark. My levels showed it. This is the first supplement I've actually stayed consistent with."
Malik O., 28
Always "fine", never sharp
More usable energy after long shifts
Recovering faster between sessions
"Nobody told me melanin changes how much D you make. Once I understood it, taking one capsule a day was an easy call. My numbers more than doubled."
Desmond K., 46
The winter dip
Mood held steady through February
Sleeping through the night
"Every winter I'd go quiet on everybody. This is the first year that didn't happen. I'm not calling it a cure — I'm saying my baseline is better."
Jerome B., 31
Foggy focus
Longer stretches of deep work
Less irritable by evening
"I take one with breakfast and forget about it. What I noticed is that I stopped losing the back half of my day."
Clifton R., 52
Low motivation
Back to morning walks
More present with the grandkids
"At 52 I thought this was just how it goes. My level was 12. My doctor wasn't surprised — she said most of her Black patients test like that."
Damon T., 37
Stalled lifts
Stronger, more consistent sessions
Less lingering soreness
"My training was solid and my numbers still weren't moving. Fixing my D wasn't magic, but it removed the thing that was holding everything back."
Isaiah M., 25
Recovery debt
Faster turnaround between sessions
Fewer nagging joint complaints
"K2 and magnesium in the same capsule was the selling point for me — I was already buying all three separately and skipping two of them."
Victor A., 44
Bone health flag
Supports calcium going where it should
Cleared my next panel comfortably
"My physical flagged low D two years running. This time I came back in range and my doctor asked what I changed. One capsule, that's it."
Melanin is natural UV protection — it absorbs a large share of the UVB rays that trigger vitamin D production in the skin. The same amount of sun that fills up a lighter-skinned person's levels leaves melanin-rich skin producing far less, which is why Black adults are consistently the most likely group to test insufficient.
5,000 IU of vitamin D3 (cholecalciferol), vitamin K2 as MK-7, and magnesium — the two cofactors your body uses to transport and activate vitamin D. 60 capsules per bottle, no fillers, no dyes, no proprietary blends.
Blood levels typically move over 8–12 weeks of consistent daily use. That's why we built the guarantee around 60 days and why we recommend testing before you start and again at the 90-day mark.
5,000 IU sits well within the tolerable upper intake level for adults and is a common clinical dose for correcting insufficiency. If you're on medication, have a kidney or parathyroid condition, or already supplement vitamin D, talk to your doctor about your own numbers first.
Not reliably. Between melanin, indoor work, clothing and the low winter sun at northern latitudes, sunlight alone rarely gets melanin-rich skin into a sufficient range — and chasing it means more UV exposure than anyone should want. Oral D3 skips the skin entirely.
Take blackd daily for 60 days. If you're not convinced, email us and we'll refund you — bottle open, capsules gone, no argument and nothing to ship back.
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