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Hormonal
IGF-1
Insulin-like growth factor 1 — a growth hormone mediator involved in tissue repair, muscle growth, and cellular aging.
Optimal Range
100-200 ng/mL (longevity-optimal range)
Why It Matters
IGF-1 exists in a complex relationship with aging. Moderate levels support muscle mass and bone density, but chronically elevated IGF-1 may accelerate cellular aging and cancer risk. The optimal range is debated in longevity medicine.