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
Standard kidney function marker, but muscle-mass-dependent — heavily muscled users often run high creatinine without kidney disease (use cystatin C as a confirmation marker if available). Eat-and-drink before draw normally; avoid intense eccentric training in last 48h (transiently raises creatinine via muscle breakdown). No direct peptide effects in common stacks. GH-axis peptides (CJC/Ipamorelin, MK-677, tesamorelin) can modestly raise creatinine via increased lean mass over months. KEY CAVEAT: dehydration falsely elevates; over-hydration falsely lowers. Cystatin C is the better marker for users with extreme body composition (very muscular or sarcopenic).
Have a recent Creatinine, serum 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.