Growth Hormone levels tend to decrease as noted by the normal reference ranges of SOMATOMEDIN-C or IGF-1, which is used to measure hGH, a pivoting hormonal mechanism in youth:[6]
AVERAGE PLASMA INSULIN-LIKE GROWTH FACTOR-1[SOMATOMEDIN-C LEVELS]GENDER AGE LOW HIGH UNITS
FEMALES 12-15 YRS 261 1096 NG/ML
FEMALES 16-24 YRS 182 780 NG/ML
FEMALES 25-39 YRS 114 492 NG/ML
FEMALES 40-54 YRS 90 360 NG/ML
FEMALES >55 YRS 71 290 NG/ML
MALES 12-15 YRS 202 957 NG/ML
MALES 16-24 YRS 182 780 NG/ML
MALES 25-39 YRS 114 492 NG/ML
MALES 40-54 YRS 90 360 NG/ML
MALES >55 YRS 71 290 NG/ML
I always thought it was from .75-1.5 ius in a health adult.
This correct depending on age.
In humans, the amount of growth hormone after age 21 to 31 falls about 14 percent per decade, so that total 24-hour growth hormone production is cut in half by the age of 60. In numerical values, we produce on a daily basis about 500 micrograms of GH at 20 years of age, 200 micrograms at 40 years, and 25 micrograms at 80. The fall in IGF-1 with age mirrors that of growth hormone.
To understand the milligram (mg) and International Units (IU's) equivalence, the rule of thumb is that one-milligram equals three IU.
So 500mcg x 3 would be 1.5iu ED for most people in 20's and as you approach 30 it wold be closer to 1iu ED and by the 40's your approaching .5iu ED.