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More on Longevity
Epigenetic vs Glycan Age Tests: Which Should You Take?
Two at-home tests, two completely different layers of biology. What methylation reads, what glycans read, how fast each responds to change, and how to choose without buying both.
Epigenetic and glycan tests both return a biological age in years, and that shared unit hides how different they are. One reads chemical tags on your DNA. The other reads sugar structures attached to your antibodies. They are not competing versions of the same measurement. They are separate instruments pointed at separate layers of biology.
That distinction decides which one answers your question, how quickly you should expect a result to move, and why two tests taken the same week can disagree without either being wrong. For the general background on what these tests are for, start with the biological age guide.
What each test reads
Epigenetic testing reads DNA methylation
Cells attach small chemical tags to specific positions on the genome, and the pattern of those tags shifts steadily across a lifetime. A trained model converts the pattern into an estimate. Because the underlying drift is slow and cumulative, methylation is closest to a structural reading: it reflects a long history more than this quarter.
Newer reports do not stop at one number. The TruAge Epigenetic Test returns an outcome-trained age estimate, a breakdown across 11 organ systems, and a pace of aging figure. How each of those models is built is covered in DNA methylation testing.
Glycan testing reads sugars on your antibodies
Antibodies are not bare proteins. Each carries attached sugar structures, called glycans, and their composition changes the way the antibody behaves, including whether it leans toward promoting or dampening inflammatory signaling. That composition shifts with age and with inflammatory state.
The GlycanAge test reads that profile and returns an age estimate built from it. Because glycan turnover happens on a timescale of weeks to months rather than years, it behaves less like a structural record and more like a current state reading.
The comparison that matters
Prices as of October 2026; product pages are the source of truth.
| Epigenetic (TruAge) | Glycan (GlycanAge) | |
|---|---|---|
| Reads | Methyl tags at defined DNA positions | Sugar structures on IgG antibodies |
| Best described as | A cumulative record | A current-state reading |
| Answers | How old do my markers read, and how fast am I accruing | What is my inflammatory profile doing |
| Responds to change in | Months to years, pace markers sooner | Months |
| Extra detail | 11 organ systems, pace of aging | Lifestyle interpretation of the profile |
| Sample | Finger-prick blood spot | Finger-prick blood spot |
| Typical retest | 6 to 12 months | 6 months |
| Price | $499 | $499 |
Why two results can disagree
People run both, see a five-year spread, and assume one test is broken. Neither is. They are reading different biology on different timescales.
A plausible and common pattern: someone who trained hard and slept badly for a decade, then fixed both six months ago, may read favorably on glycans and unremarkably on methylation. The glycan profile has had time to respond. The methylation record has not caught up, and would not be expected to.
The reverse happens too. A long history of good habits interrupted by a recent stressful stretch can read well on the cumulative measure and poorly on the current-state one.
Neither result is the truth. Read together they say something more useful than either alone: here is the accumulated position, and here is the current direction.
Choosing one
If you want the most detailed single report, take the epigenetic test. Three model outputs, an organ-system breakdown, and a pace figure give you more to act on than a single number, and the pace marker is the part that responds soonest to change.
If your interest is inflammation, or you want feedback on a lifestyle change within months instead of a year, take the glycan test. It was built to move on that timescale.
If you want both, do not buy them together. Space them. Take one as a baseline, make one change and hold it, then take the other six months later so each purchase buys you new information, not a duplicate snapshot of the same week.
What neither one does
- Neither diagnoses or screens for disease. Both are wellness estimates and neither replaces bloodwork or a physician.
- Neither predicts your lifespan. The models are trained on populations.
- Neither is comparable to the other, or to a third company's test. A methylation age and a glycan age are different instruments, so a retest has to use the same test as the baseline.
- Neither reads to the decimal. Single results carry a margin; the trend is the trustworthy output.
Kove does not provide medical advice; see the medical disclaimer.
A third option worth knowing about
If what you want is a picture of what is going on in the body, not an age estimate, the TruHealth Biomarker Test reports epigenetically estimated biomarkers across inflammation, immune function, metabolic health, nutrition, toxin exposure, and oxidative defense, at $499. The combined kit returns both TruAge and TruHealth report sets from one collection at $849, which is the cheaper route if you know you want both.
Frequently asked questions
Which is more accurate, epigenetic or glycan testing?
Neither is more accurate in general, because they measure different things. The better question is which is more useful for your goal: cumulative position and pace, or current inflammatory state.
Should I take both tests?
Only if you space them. Taken the same week they mostly duplicate each other's news value. Six months apart, with one change held in between, each one is worth its cost.
Why is my glycan age different from my epigenetic age?
Because the two tests read different layers of biology on different timescales, with models trained on different data. A spread between them is expected and is not a sign that either test failed.
Do either of them require a blood draw or fasting?
No, neither test needs a blood draw or fasting. Both use an at-home finger-prick blood spot returned in a prepaid mailer, no fasting required, adults 18 and over.
How long do results take?
TruDiagnostic reports 10 to 14 business days from the point the lab receives your sample. GlycanAge typically takes a few weeks. Both deliver digitally.
Can I use HSA or FSA funds?
Both are among the categories that can qualify with a Letter of Medical Necessity, decided per order by an independent licensed provider through Truemed at checkout. See the HSA and FSA page.
Which should I retest with?
The same one you used for your baseline. Results do not carry across methods or companies, so switching tests resets your trend line. Timing is covered in how people retest.
Which test to choose
Methylation is a cumulative record and moves slowly. Glycans are a current-state reading and move in months. Pick the epigenetic test for depth and pace, the glycan test for inflammatory feedback on a shorter loop, and if you want both, buy them six months apart.
Both are $499 with free US shipping and the Price Beat guarantee: TruAge Epigenetic Test and GlycanAge.
