Growth
Men Women (soon)
IGF-1 reflects growth-hormone-axis activity. U-shaped relationship with mortality: too low or too high both unfavorable.
Optimal range
Range varies by individual.
Why this biomarker matters
Optimal IGF-1 sits in the middle-upper range for age. Very low IGF-1 associates with sarcopenia; very high IGF-1 with cancer risk.
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