Here is something I found online about time periods.
Since there are many factors to consider when anticipating results from HGH therapy (such as one's age, unique metabolism, exercise frequency, dietary habits, current health status, etc.), it is difficult to establish exact time frames as to when all persons will recognize results. In view of this, the expected timeframe for each person will vary. Some general guidelines would be 2 to 4 weeks for improvement in overall well-being, with many more benefits beginning to be realized near the 3 month point. By 6 months, a significant degree of cellular transformation should be occurring and many specific benefits should be recognized. The process of cellular transformation does take a reasonable period of time. To expect instant results is unrealistic, however, if you believe in our products and take them faithfully as thousands of our loyal and satisfied customers have done, then you too, can be successful in your desire to look younger, feel better, and have more energy to live your life.