Reference ranges
Optimal ranges are tighter than standard lab ranges and reflect functional-medicine targets, not the populations they were derived from. Reference bands depend on sex, age, and circumstance — Juno's lab analysis layers your profile context onto the printed range when you paste a value.
Peptide relevance
Biologically active thyroid hormone — symptoms correlate with T3 more than T4. Low T3 with normal T4 can indicate poor T4→T3 conversion (selenium / zinc deficiency, chronic stress, low-calorie dieting, illness). Common in users doing aggressive cuts or fasting. Tirzepatide / Semaglutide may slightly lower T3 during rapid weight loss (adaptive thermogenesis). No direct peptide effects from the standard stack peptides documented. Reverse T3 (rT3) is the inactive isomer — order alongside if poor conversion is suspected.
Have a recent Free T3 (free triiodothyronine) value?
Paste it on the lab analysis page. Juno reads your active stack + (if shared) your medications and conditions, and surfaces plausible contributors with citations. Doesn't diagnose.
Sign-in required. The analysis is saved to your private history and audit-logged.