Vitamin D Intake Needs
The dose required to reach optimal blood levels ranges from 1,000 to 10,000 IU daily between different people. Your receptor and binding-protein variants tell you exactly where you land—no more trial-and-error supplementation.
What this measures
How your DNA shapes vitamin D intake needs.
Three genes work together to move vitamin D from the form your skin produces (or your supplement provides) to the biologically active form your cells use. GC carries it through the bloodstream. CYP2R1 activates it in the liver. VDR (the vitamin D receptor) is what your tissues use to actually respond to the active form.
Variants across these three genes are associated with anywhere from typical vitamin D handling to reduced binding, slower activation, or less responsive receptors. Carriers of multiple lower-efficiency variants may need higher blood levels of vitamin D to produce the same downstream effect — which is why two people on identical supplementation can have very different lab results and very different symptom pictures.
Sunlight produces vitamin D in skin. Latitude, melanin, sunscreen, and age all change how much you make. Magnesium is required to activate the molecule into its usable form. Co-supplementation with K2 supports the downstream calcium-handling work the active hormone does. Body fat sequesters vitamin D, so body composition shifts serum levels.
A standard "2,000 IU daily" recommendation is built on the average response. Your variants may put you well below or well above the average — and knowing which side changes how you supplement, when you retest, and what blood level you should actually be targeting.
Vitamin D Intake Needs is one specific finding in this system. Your Genomic Lifestyle Optimization Report shows where your variants place you on the micronutrients and strategic supplementation spectrum — and what you can do about it: it renders as a dark card with a color marker calibrated to your variants, opening with the gene mechanism and closing with a practical, mechanism-led recommendation.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Fat-Soluble Vitamins: the 7-insight cluster.
Vitamin D Intake Needs is one finding in a tightly-related cluster. Mosaic sequences the other 6 alongside it so you see the whole biology — not an isolated data point.
Questions people ask
About Vitamin D Intake Needs.
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