There are natural options for you to increase your growth hormone levels and insulin-like growth factor-1 (IGF-1) levels.
Products you consider should have one or more of these ingredients.
Agmatine 500-l,000mg 30-60 minutes before workouts.
Arginine 2-5 g taken in the morning and before workouts.
Alpha-GPC 250-600mg one hour before workouts and before bed.
Betaine (trimethylglycine) l,500-3,000mg with pre- and post-workout meals.
Colostrum 5 grams with your pre and postworkout shakes, as well as your morning and nighttime shakes.
Gamma-Aminobutymc Acid (GABA) 2-10g per day before workouts and/or before bed on an empty stomach. (3 - 5 grams per serving)
Glutamine 5-10 grams of about 90 minutes preworkout and at bedtime.
Glycine 6.75 grams of glycine increased growth hormone levels up to 300 to 400 percent.
Humanofort 30-100mg in the morning, before workouts, and before bedtime.
Lysine 1,500-3,000 mg first thing in the morning, in the afternoon and at night between meals.
Melatonin 5 mg 1 hour before workouts and 0.3-10mg about an hour before bedtime.
Mucuna Pruriens or velvet bean 100-400mg taken 30-60 minutes before workouts and before bedtime .
Norvaline 100-250mg daily.
Ornithine 1-2 g on an empty stomach, along with arginine, two or three times per day with Arginine.Sources:
Stoppani, Jim. The Encyclopedia of Supplements, Flex 29.10 (Dec. 2011): p196.