Factors that are known to cause variation in the levels of GH and IGF-1 in the circulation include an individuals genetic make-up, the time of day, their age, sex, exercise status, stress levels, genetics, nutrition level and body mass index ( BMI ), disease state, race, estrogen status and xenobiotic intake.

Factors that are known to cause variation in the levels of growth hormone ( GH ) and IGF-1 in the circulation include: genetic make-up, the time of day, age, sex, exercise status, stress levels, nutrition level and body mass index ( BMI ), disease state, race, estrogen status and xenobiotic intake.

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