Bryan Johnson reports an eHbA1c of 4.4%

On 6 September 2026, Bryan Johnson posted that his estimated HbA1c was 4.4%, which he called a new personal best and placed in the top 99.8 percentile of healthy 20-year-olds. He lists general actions intended to keep glucose stable: a 14–16-hour daily fast, heavy lifting to build muscle, walking after meals or doing air squats every 45 minutes, avoiding added sugar, and prioritising sleep. The post does not state whether eHbA1c came from a laboratory HbA1c assay, continuous-glucose-monitor estimate, or another calculation. It gives no sample date, repeat measurements, calibration data, confidence interval, comparator cohort definition, medication context, or clinical outcome. A single low value cannot show that the listed actions caused the result, nor that it reduces disease or mortality risk. This record therefore treats the post as a self-reported n=1 biomarker update. It does not validate the percentile comparison or convert the value into a longevity result. No ingredient grade changes follow; the cited behaviours are not evidence for any supplement.

Top 99.8 percentile of healthy 20 yr olds > eHbA1c 4.4% > elite among elite > new personal best.