Fructosamine
Glucose Metabolism marker
Fructosamine
A measure of glycated serum proteins (chiefly glycated albumin) that reflects average blood glucose over roughly the previous 2 to 3 weeks. Because serum proteins turn over faster than red blood cells, it captures a shorter, more recent window than HbA1c.
PED Notes
Fructosamine is most useful precisely when HbA1c is unreliable, which is a real and under-appreciated issue for enhanced athletes. HbA1c depends on red-cell lifespan, so AAS/TRT-driven erythrocytosis, frequent therapeutic phlebotomy or blood donation, and any recent blood loss all shorten red-cell survival and falsely LOWER HbA1c, potentially masking real hyperglycaemia. In those situations fructosamine (or glycated albumin) gives a truer picture of glucose control. This matters for athletes running growth hormone, MK-677, or exogenous insulin, all of which can push glucose up: a reassuring HbA1c in a polycythaemic GH user may be misleading, and a fructosamine cross-check is worthwhile. It also responds faster, so it shows the effect of a diet or drug change within a few weeks rather than months. Note that low albumin or high protein turnover can distort the result.
When high
When fructosamine is elevated (average glucose running high):
First confirm the picture:
- Cross-check against fasting glucose, HbA1c, and (if available) glycated albumin. In an athlete with erythrocytosis or recent phlebotomy, a high fructosamine with a "normal" HbA1c likely means the HbA1c is falsely low and the fructosamine is closer to the truth.
Lifestyle and supplements:
- Reduce refined carbohydrate and total energy intake; prioritise fibre and protein
- Regular cardio and post-meal walking improve glucose disposal
- Berberine -- 500mg 2-3x/day before meals; improves insulin sensitivity and lowers glucose
- Omega-3 (EPA/DHA) -- 2-3g/day; supports metabolic health
Pharmacological options (particularly for GH/MK-677/insulin users with rising glucose):
- Metformin -- 500-2000mg/day; first-line insulin sensitiser; improves fasting and post-prandial glucose; monitor for GI effects and B12 over long-term use; physician supervision
- GLP-1 agonists (semaglutide, tirzepatide) -- weekly subcutaneous; lower glucose and body weight and are well suited to GH-driven insulin resistance; prescription only
- Any athlete using GH, MK-677, or insulin who shows a rising fructosamine should have glucose management reviewed by a physician before continuing
History Chart
Reading History
Frequently Asked Questions
Reference Ranges
Standard Range
VitalMetrics Range