A low IGF-1 level may indicate poor nutrition, growth hormone deficiency, or certain health conditions like malnutrition, liver disease, or pituitary gland disorders.
The main difference between IGF1 and IGF2 is when they are used for growth. IGF1 is an important growth hormone during childhood and adulthood, whereas IGF2 contributes to growth during the fetal stage.
Homeopathy, according to the most recent meta-analysis study, is no better than a placebo. If you are actually ill, please see a doctor.
Antarctic scientists have measured their hair growth changing just before going back home to their wives. The anticipation of sex raised their testosterone leves. You can also do weights exercise - muscle hypertrophy/growth, set in motion by challenging weights regimes, is caused by testosterone, human growth hormone, and insulin-like growth factor 1 (IGF1). But I'm guessing you're already doing weights and just want to get bigger. Train smarter, don't cheat in your technique when you exercise, vary your routines when you plateau and you'll achieve muscle growth. Train dumb, cheat, do the same stuff day in & day out, and you'll stagnate.
Genes that control growth and body size, such as those involved in the insulin-like growth factor 1 (IGF1) pathway, can influence the size of a dog breed. Selective breeding for small size over generations can also contribute to the development of miniature breeds.