HbA1c reflects average blood glucose over 90 days and is the key marker for insulin sensitivity. AAS — particularly 17-alpha alkylated orals and high-dose testosterone — can impair insulin sensitivity, gradually pushing HbA1c upward.
Nandrolone and trenbolone are particularly associated with insulin resistance; athletes with pre-existing metabolic risk may see HbA1c creep toward prediabetic range (5.7–6.4%) during cycles.
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Analyze My Bloodwork →GearCheck provides blood marker analysis and harm reduction education. Information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional.