Longevity and metabolism
Glycation, AGEs and Sugar Ageing: What You Can Actually Measure
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed August 20268 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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Glycation is sugar sticking to proteins in your body. It happens constantly, and it speeds up when blood sugar runs high. No home test measures your total AGE load. But HbA1c does measure glycation directly, in your red blood cells, and it is the honest number to track over time.
Find the test that measures your HbA1c →As of August 2026, glycation has become one of the loudest ideas in longevity. AGE-inhibitor supplements are now a tracked commercial category in their own right, with market research houses publishing dedicated forecasts on them in January 2026. The word has moved out of skincare and into the supplement aisle.
Most of the coverage skips the useful part. Glycation is a real, measurable process. It is just that the thing being sold and the thing that can be measured are not the same thing.
1. What is glycation?
Glycation is a chemical reaction. A sugar molecule in your blood binds to a protein or a fat, with no enzyme steering it. The result is a stickier, slightly altered molecule. Some of those altered molecules go on to become advanced glycation end products, usually shortened to AGEs.
It is the same family of reactions that browns toast and crisps the skin on a roast chicken. Chemists call it the Maillard reaction. Inside a body it runs far slower, at body temperature, over years.
AGEs settle in long-lived tissue. Collagen in skin. The walls of arteries. The lens of the eye. Everyone accumulates them, and that accumulation is a normal part of ageing. What varies is the rate. Higher average blood sugar means faster glycation, which is where the “sugar ageing” shorthand comes from.
2. AGEs, glycation and HbA1c: what is the difference?
Three words get used interchangeably online. They are not the same.
- Glycation is the reaction itself, happening right now, all over your body.
- AGEs are the durable end products it leaves behind in tissue.
- HbA1c is one specific, early glycation product that a lab can count precisely: sugar bound to the haemoglobin in your red blood cells.
Diabetes UK puts the mechanism simply. HbA1c, it says, “is something that's made when the glucose (sugar) in your body sticks to your red blood cells”. That is glycation, described in a sentence, on a marker your GP already uses.
A red blood cell lives roughly two to three months. Once sugar attaches, it stays attached for the life of that cell. So HbA1c reads as an average of your blood sugar across that window, rather than a snapshot of this morning.
There is a second source of AGEs: food. Cooking creates them. A 2010 analysis in the Journal of the American Dietetic Association measured AGE content across hundreds of foods. Dry heat raised the AGE content of a food by roughly 10 to 100 times its raw state. Moist heat, shorter cooking, lower temperatures and acidic ingredients such as lemon juice or vinegar all cut that formation. Grilling and frying sit at the high end. Poaching and steaming sit at the low end.
3. Can you actually measure your AGEs?
Not with a blood test you can buy. This is the gap between the trend and the reality, and it is worth being blunt about it.
Researchers do estimate tissue AGEs, using an instrument that shines light at the forearm and reads the fluorescence that comes back. Some AGEs glow. The technique is called skin autofluorescence, and studies have linked higher readings to cardiovascular risk factors and to metabolic syndrome. It is a research instrument. It is not on sale to consumers in the UK, and it is not something a home test kit can do.
So the practical question changes. You cannot count the AGEs already sitting in your collagen. You can measure the thing that drives how fast new ones form, which is your average blood sugar. That is HbA1c, and it costs a finger-prick.
4. Do the AGE-blocker supplements do anything?
The category usually features carnosine, benfotiamine, alpha-lipoic acid and various polyphenol extracts. The marketing language tends to run well ahead of the human evidence.
Most of what supports these ingredients is laboratory work, animal work, or small trials in people who already have diabetes. None of them is a licensed medicine in the UK. None has been shown to clear AGEs that have already formed in tissue. Treat any product promising to reverse glycation as a claim without a settled evidence base behind it.
There is a less glamorous version of the same goal. Average blood sugar responds reliably to food pattern, weight, sleep and activity. Those levers are unexciting, they are free, and unlike an AGE-blocker capsule, their effect shows up on a number you can check. Our guide on lowering HbA1c covers what actually moves it.
5. Which numbers are worth tracking?
In the UK, HbA1c is reported in mmol/mol. NICE and the NHS use three broad bands:
- Below 42 mmol/mol is the normal range.
- 42 to 47 mmol/mol is called non-diabetic hyperglycaemia. NICE advises an annual recheck for people in this band.
- 48 mmol/mol or above sits in the diabetes range and is a conversation for your GP, not for a supplement.
A blood test measures these markers and offers wellness insight. It does not diagnose anything. A result in the middle band suggests your glycation rate is running higher than ideal, and that is information you can act on.
Two markers sit usefully alongside it. hs-CRP is a sensitive measure of low-grade inflammation, the process AGEs are most often linked to in research. Triglycerides track the fat side of the same metabolic picture, and our cholesterol blood test guide explains how they read together.
The Advanced Heart Health panel (£159) measures all three, plus ApoB and Lp(a). It is a home finger-prick test processed by UKAS-accredited UK laboratories, with results in around 5 working days and a report read by a qualified clinician.
One practical note on timing. Because HbA1c reflects two to three months of average blood sugar, leave at least 12 weeks between a baseline and a retest. Testing sooner mostly measures noise. If you would rather assemble your own marker list, the build-my-test tool walks you through it.
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Measure the glycation you can actually change
Test HbA1c now, change what you eat and how you move for 12 weeks, then test again. Helvy's home finger-prick panels measure HbA1c, hs-CRP and triglycerides, with results in around 5 working days from UKAS-accredited UK laboratories.
Frequently asked questions
Is there a blood test for advanced glycation end products?
Not one you can buy in the UK. Tissue AGEs are estimated in research using skin autofluorescence, an instrument that reads light bounced off the forearm. The measurable proxy available to you is HbA1c, which counts sugar bound to your red blood cells and reflects your average blood sugar over two to three months.
Is HbA1c the same thing as glycation?
HbA1c is one product of glycation, not the whole process. It is glycated haemoglobin, formed when glucose sticks to red blood cells. Because it is easy to measure and reflects a two to three month average, it is the standard way to see how fast glycation is running in your body.
Which cooking methods produce the fewest AGEs?
Moist, slower, cooler methods. A 2010 analysis in the Journal of the American Dietetic Association found dry heat raised the AGE content of foods by roughly 10 to 100 times the raw state, and that moist heat, shorter cooking times, lower temperatures and acidic marinades such as lemon juice or vinegar all reduced it. Poaching and steaming sit low; grilling and frying sit high.
Can supplements reverse glycation?
No supplement has been shown to clear AGEs already formed in tissue. Ingredients such as carnosine and benfotiamine are backed mostly by laboratory and animal work, or by small trials in people with diabetes, and none is a licensed medicine in the UK. Lowering average blood sugar is the lever with an evidence base and a number you can check.
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