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Insulin-like Growth Factor 1 (IGF-1) is a hormone made by the liver in response to growth hormone (GH) and is essential for cellular repair, metabolism, skin health, bone density, and energy. In women, IGF-1 supports muscle tone, cognitive function, fat metabolism, and hormonal balance, especially as growth hormone levels naturally decline with age. Low IGF-1 levels can lead to fatigue, poor recovery, thinning skin, and age-related muscle loss. High levels may indicate excess GH production and should be evaluated further. Testing IGF-1 gives a clear picture of your anabolic health and anti-aging potential, especially if you’re addressing symptoms of hormone decline or chronic fatigue.