FUT2 Status
"Non-secretor" status changes how you absorb B12 and shapes your gut microbiome. This explains why some vegetarians stay healthy for decades while others crash within years—same diet, very different biology.
What this measures
How your DNA shapes fut2 status.
FUT2 codes for an enzyme that builds specific sugar molecules onto the surface of cells lining the gut, saliva, and other body fluids. The "secretor" trait (active FUT2) places those sugars where gut bacteria can use them as food, shaping which microbes thrive. The "non-secretor" trait (FUT2 inactive) does the opposite.
Roughly 20% of people are non-secretors — carriers of two inactive FUT2 alleles (most commonly the W143X variant). Non-secretors are associated with higher circulating B12 levels (gut bacteria don’t consume as much), reduced susceptibility to certain norovirus strains, and different microbiome profiles than secretors. Neither is "better" — the two patterns produce different baselines.
Microbiome diversity differs between secretors and non-secretors, which influences fiber response, immune signaling, and inflammation. Prebiotic fibers feed different organisms in each group; one client’s "fiber works wonders" outcome may not transfer to a friend with the opposite FUT2 status.
The "I take the same B12 dose but my labs run higher than my partner’s" or "fermented foods agree with me differently" experiences often track to FUT2. Which version you carry changes how to read B12 results, how to support gut diversity, and which probiotic strains actually colonize.
FUT2 Status 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.
In your report
Where FUT2 Status lives inside your Genomic Lifestyle Optimization Report.
FUT2 Status renders as a dark-background card with a color marker calibrated to your specific variants. The card opens with the gene mechanism, shows your result at a glance via that marker, and closes with a practical, mechanism-led recommendation — what to eat, what to time, what cofactors to support.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Water-Soluble Vitamins: the 8-insight cluster.
FUT2 Status is one finding in a tightly-related cluster. Mosaic sequences the other 7 alongside it so you see the whole biology — not an isolated data point.
- Choline Intake NeedsCholine demand varies 2–3× between people. Higher-need individuals see noticeable improvements in focus, fat metabolism, and liver function from eggs or supplementation—while others coast fine without thinking about it.
- Folate Intake NeedsFolate requirements vary widely—especially during pregnancy, high stress, or rapid cell turnover. Knowing yours prevents the subtle deficiency that quietly affects mood, energy, and long-term health without obvious symptoms.
- Folic Acid Conversion EfficiencyCommon variants reduce the conversion of synthetic folic acid (in supplements and fortified foods) into active methylfolate. If you're affected, standard prenatals and "enriched" bread aren't doing what you think. Methylfolate does.
- Thiamine Intake NeedsB1 demand rises with carbohydrate intake and stress. Higher-need individuals experience energy and mood crashes on high-carb diets until thiamine is optimized—and often don't connect the dots until they see their genetics.
- Vitamin B12 Intake NeedsB12 absorption efficiency drops with age, plant-based diets, and gut issues. Your intrinsic factor and transporter status predict whether you'll stay sufficient long-term, or quietly slide into deficiency that mimics aging and cognitive decline.
- Vitamin B6 Intake NeedsDemand for neurotransmitter synthesis and hormone metabolism varies widely. Higher-need individuals see dramatic mood, PMS, and energy improvement with correct dosing—often after years of thinking that's just how they feel.
- Vitamin C Intake NeedsOxidative stress handling and collagen demands differ between people. Some recycle vitamin C efficiently; others burn through grams during stress, illness, or intense training. Your category determines whether RDA is enough or barely a starting point.
Questions people ask
About FUT2 Status.
- How does my DNA influence fut2 status?
- Where vitamin meets variant: the MTHFR methylation cycle (folate), the GC/CYP2R1/VDR vitamin-D activation pathway, the TMPRSS6/HFE iron-handling network, and the genes that determine which forms of B12, magnesium, and choline your body actually absorbs versus ignores.
- What kind of test do I need to see my FUT2 Status result?
- Whole-genome sequencing at 30× clinical depth. Consumer SNP-chip tests like 23andMe or AncestryDNA only read ~0.02% of your DNA and miss most of the variants this analysis needs. Mosaic reads all 3 billion base pairs and produces the full 108-insight report.
- How is FUT2 Status different from clinical lab testing?
- Clinical labs measure downstream biomarkers — blood levels, hormone values, metabolic byproducts — at a single point in time. Genomic insights like FUT2 Status reveal the underlying variant that shapes the biology, which is constant for life. The two are complementary: labs show the current snapshot; genomics shows the long-term tendency and where lifestyle leverage is highest.
More from Micronutrients and Strategic Supplementation
micronutrients and strategic supplementation
Blood Pressure Sensitivity to Sodium Intake
About half of people see their blood pressure rise with salt; the other half are neutral. This decides whether low-sodium is medically mandatory or an unnecessary restriction that just makes food taste worse.
Read insight →micronutrients and strategic supplementation
Choline Intake Needs
Choline demand varies 2–3× between people. Higher-need individuals see noticeable improvements in focus, fat metabolism, and liver function from eggs or supplementation—while others coast fine without thinking about it.
Read insight →micronutrients and strategic supplementation
Copper Levels
Copper is a behind-the-scenes player—affecting iron absorption, collagen production, and antioxidant defense. The catch: both deficiency and excess cause problems, and they look surprisingly similar. Your regulation pattern tells you which direction to watch.
Read insight →micronutrients and strategic supplementation
Folate Intake Needs
Folate requirements vary widely—especially during pregnancy, high stress, or rapid cell turnover. Knowing yours prevents the subtle deficiency that quietly affects mood, energy, and long-term health without obvious symptoms.
Read insight →micronutrients and strategic supplementation
Folic Acid Conversion Efficiency
Common variants reduce the conversion of synthetic folic acid (in supplements and fortified foods) into active methylfolate. If you're affected, standard prenatals and "enriched" bread aren't doing what you think. Methylfolate does.
Read insight →micronutrients and strategic supplementation
Iron Intake Needs
Iron absorption and loss rates differ dramatically between people. Knowing yours prevents both anemia (too little) and accidental iron overload (too much)—two problems with opposite solutions that feel confusingly similar.
Read insight →
One test. 108 personalized findings. All yours.
Order your Mosaic kit. Receive your raw genomic data and the full Genomic Lifestyle Optimization Report in 15–20 days.