Insulin-like Growth Factor-1 (IGF-1)
Reflects growth hormone activity. A longevity marker.
What it tests: A hormone that reflects growth hormone activity, recovery, and tissue repair.
Why it is important: Sits at the center of an ongoing tension in longevity science. Adequate signaling supports muscle, recovery, and tissue maintenance; excessive signaling may accelerate aging-related processes. The goal is typically a mid-range value.
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