TIBC
Transferrin capacity - elevated in iron deficiency, suppressed in iron overload.
How TIBC ranges relate
The standard lab range vs the optimization-focused target. Illustrative trajectory shows what a 12-week improvement pattern looks like — not real user data.
What TIBC Measures
TIBC measures transferrin's total binding capacity for iron. In iron deficiency, TIBC rises (more "empty seats" on the carrier) even before ferritin fully depletes. In iron overload (hemochromatosis), TIBC is suppressed.
Transferrin saturation (serum iron ÷ TIBC × 100) is the functional derived metric - optimal range is typically 25–45%.
What Affects This Biomarker
TIBC is influenced by: iron status (rises in deficiency, falls in overload), protein synthesis (low in liver disease or malnutrition), estrogen (raises it), and inflammation (suppresses it).
In the Context of Peptide Protocols
Reviewed as part of a full iron panel every 6–12 months when tracking iron. Persistent high saturation (>50%) warrants HFE gene workup for hemochromatosis.
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Start tracking →Informational only - not medical advice. Reference ranges vary by lab and individual context. Work with a licensed provider to interpret your specific results.