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Normal ranges: Normal IGF-1 levels vary significantly by age: Ages 25-39: 116-358 ng/mL Ages 40-54: 90-360 ng/mL Ages 55+: 71-290 ng/mL Note: These are general reference ranges
In clinical and cosmetic literature, this distinction matters because a topical serum, wound gel, liposomal formula, and injectable preparation may have very different safety and absorption profiles
ECM, extracellular matrix
statnews.com FDA
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