Function Health Alternatives: What a 100-Biomarker Panel Still Can't Tell You About Aging

A 100-biomarker blood panel can tell you exactly what your cholesterol, glucose, and hormone levels are doing right now. It cannot tell you whether your immune system is ageing faster than your driver's license suggests, or whether the supplement stack and training plan you started three months ago are actually changing your underlying biology. For that, you need a biomarker built to track chronic, low-grade inflammation over time, which is where glycans (complex sugars attached to antibodies) and the GlycanAge test come in. For people comparing Function Health alternatives, this article answers the questions people typically ask once they realise a comprehensive panel like Function Health gives them a wide snapshot, but not a verdict on biological ageing, and want to know what closes that gap.

What does a 100-biomarker panel like Function Health actually measure?

Platforms built around comprehensive blood panels measure standard clinical biomarkers: lipids, glucose, hormones, liver enzymes, inflammatory markers like CRP, and dozens of others drawn from a single blood draw. These are genuinely useful numbers, but they share one structural limitation. Generic blood panels measure standard biomarkers, such as lipids, glucose, hormones, inflammatory markers, that fluctuate daily and do not produce a validated biological age score. A panel can flag that your fasting glucose is borderline this week, but it was not built to answer the separate question of how fast your immune system is ageing across months and years. That requires a biomarker designed specifically to track a core ageing process rather than a snapshot of current chemistry.

Why doesn't a big biomarker panel produce a biological age score?

A score only counts as a validated biological age measure if it meets a specific scientific bar, and volume of data points is not that bar. Biological age tests use ageing clocks, tools built on specific biomarkers that change in a predictable pattern over time, to estimate how quickly or slowly the body is ageing internally. The American Federation for Aging Research has outlined what an ideal ageing biomarker should do: predict future health better than chronological age alone, produce consistent and repeatable results, track a core ageing process, and be applicable across both human and research settings. Standard blood chemistry was built for diagnosing acute conditions and monitoring day-to-day physiology, not for passing that four-part test. Running 100 of those markers together still does not convert them into a validated ageing clock. Choosing a test built on that four-part standard, rather than an aggregation of general wellness markers, is what to look for in a biological age test.

What is the missing signal that comprehensive panels don't capture?

The signal missing from standard panels is inflammaging, the chronic, low-grade inflammation that accumulates over years and quietly drives age-related disease, as distinct from the acute inflammation a CRP spike reflects on a given day. This is the layer that IgG glycosylation reveals — the pattern of complex sugars attached to immunoglobulin G antibodies, measured as the ratio of pro-inflammatory to anti-inflammatory glycan structures. The test analyses 29 glycan structures grouped into five indexes, and is built to meet the AFAR filter directly: it functions as the ageing clock most responsive to lifestyle and medical interventions, while also serving as a stable, low-noise biomarker that reflects true biological change rather than day-to-day fluctuation.

"Glycans are very dynamic biomarkers. They're not static — it's not a pattern that stays fixed forever. They're modifiable by processes like inflammation, immune function, age, cardiovascular risk factors, and medications."

— Prof. Samia Mora, Harvard Medical School

That combination, stability at rest and responsiveness to real change, is exactly what a 100-marker snapshot panel is not built to deliver.

Should I replace my Function Health panel with GlycanAge, or run both?

Run both. They answer different questions, and neither makes the other redundant. The two are complementary, not competing. If you already run annual blood work, this test adds the missing inflammatory and immune-ageing layer — the layer that reveals whether your results are translating into slower biological ageing. Your comprehensive panel tells you what your organ systems and metabolic markers look like today. The glycan test reveals whether the sum of your lifestyle, stress, hormones, and interventions is actually shifting the pace of your biological ageing.

"I've been tracking my own GlycanAge for nearly a decade, and what I do in my life clearly affects the pace of the change. When I shift to a healthier lifestyle, it goes down. It's responsive to interventions — it tells me whether what I'm doing is actually working."

— Prof. Gordan Lauc, Professor of Biochemistry and Molecular Biology, University of Zagreb, and Co-Founder & Chief Scientific Officer, GlycanAge

Think of the blood panel as your dashboard of current readings and the glycan test as the trend line underneath it.

Is GlycanAge more accurate than a big panel because it tests more biomarkers?

No, and that is not the right comparison to make. This test prioritises depth of relevance over marker count, analysing glycan structures focused specifically on immune ageing and inflammation rather than hundreds of unrelated markers. A test that estimates chronological age almost perfectly can still fail as a biological age tool, because a perfect predictor of how old someone is cannot also show how their health diverges from that number. A perfect age predictor would give no information about variation between individuals of the same age, and even near-perfect predictors have too little variation to be indicative of health status or outcomes beyond chronological age.

"A much smaller set of biomarkers turned out to be just as prognostic of biological age as the thousands we started with. Once you have a large enough dataset, you can make good predictions without needing to keep expanding the marker count."

— Dr. Peter Joshi, Chief Scientist, Humanity Health; University of Edinburgh

This does not mean the assays themselves cannot be used to estimate biological age, but it highlights a limitation of training ageing clocks on chronological age. The real test of a biomarker is whether it predicts future health outcomes and responds meaningfully to intervention, not how many data points feed into it.

How much does a validated biological age test cost compared to a comprehensive panel?

Price varies by category, and the gap reflects what is actually being measured and validated, not just marketing. Basic wellness blood panels run $50 to $200 and cover standard biomarkers such as lipids, glucose, and hormones, but include no validated biological age score. Telomere length tests run $100 to $400. Epigenetic or DNA methylation tests run $400 to $850 as a single purchase and reflect historical gene expression patterns. GlycanAge pricing starts at approximately €499 for a single test, and every plan includes access to book a 1:1 specialist consultation. Price correlates with scientific rigour when the higher cost reflects validated laboratory methodology, peer-reviewed research, and expert interpretation, not marketing.

If I've already done a DNA test or an epigenetic clock, do I still need this?

Yes, because genetic and epigenetic tests answer a different question. A DNA test reveals static genetic potential, an inherited risk profile that does not change regardless of what you do this year. An epigenetic clock reflects historical patterns of gene expression, essentially a look backward at cumulative exposure. A glycan-based test instead measures active, current inflammation — the biological state you are in right now, and whether your interventions are shifting it. If you have already run a DNA panel, treat it as your starting context, not your final answer, and add a biomarker that moves when your biology actually changes.

What should I actually do with my Function Health results once I have them?

Use your comprehensive panel results as a baseline for organ-specific and metabolic health, then add a biological age test built to track change over time against that baseline. Order a GlycanAge test, book a 1:1 Result Interpretation Call with a specialist to review your results, and set a retest window based on the intervention you're tracking: 3–4 months if you're starting a pharmaceutical or HRT-based change, or 6–12 months for a lifestyle intervention such as a new supplement protocol or training change. Bring both result sets to your clinician: the panel shows current clinical markers, and the glycan indexes (Glycan Shield, Glycan Youth, Glycan Mature, Glycan Median, Glycan Bisection) show whether your biological age is actually trending down.

A broad biomarker panel is a strong foundation. It was never built to answer whether your biology is ageing faster or slower than your birth certificate suggests, or whether the changes you are making are working beneath the surface. If you are ready to add that missing layer, order a test kit and book your Result Interpretation Call, or if you are a clinician looking to integrate biological age tracking into patient care, visit the Healthcare Providers page to see how GlycanAge fits into existing workflows.

External sources

• American Federation for Aging Research. Biomarkers of aging [Internet]. New York: AFAR; 2016 [cited 2026 Oct 2]. Available from: https://www.afar.org/imported/AFAR_BIOMARKERS_OF_AGING_2016.pdf

• Krištić J, Vučković F, Menni C, Klarić L, Keser T, Beceheli I, et al. Glycans are a novel biomarker of chronological and biological ages. J Gerontol A Biol Sci Med Sci. 2014;69(7):779-89. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC4049143/

• GlycanAge. GlycanAge test: how it works, accuracy & cost [Internet]. Zagreb: GlycanAge; 2026 [cited 2026 Oct 2]. Available from: https://glycanage.com/frequently-asked-questions/glycanage-test-how-it-works-accuracy-cost

• Macdonald-Dunlop E, Taba N, Klarić L, Frkatović A, Walker R, Hayward C, et al. A catalogue of omics biological ageing clocks reveals substantial commonality and associations with disease risk. Aging (Albany NY). 2022;14(2):623-59. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8833109/