The oral bioavailability of oxandrolone is 97%.  Its plasma protein binding is 94 to 97%.  The drug is metabolized primarily by the kidneys and to a lesser extent by the liver .   Oxandrolone is the only AAS that is not primarily or extensively metabolized by the liver, and this is thought to be related to its diminished hepatotoxicity relative to other AAS.   Its elimination half-life is reported as to hours but is extended to hours in the elderly.   Approximately 28% of an oral dose of oxandrolone is eliminated unchanged in the urine and 3% is excreted in the feces . 
You will have to use HGH in a pulsate manner, meaning injections taken every second day gives better results than daily injections. Rather use the higher end of the dosage range on these days. For instance, instead of using 3IU's daily, rather opt for 6IU's every second day. Dosing should be at periods not close to sleep or training sessions, or close to supplement ingestion containing Arginine, OKG or GABA. It’s more effective to use it early morning and later again before lunch. Follow each dosage by ingestion of at least 50-60gr high quality hydrolyzed whey protein, taken in at temperature of about 4C this will improve gut emptying and by the time the IGF-1 is released to the gut, your whey is available for absorption. Do not use Insulin around the same time as your HGH, neither use IGF-LR3 or MGF close to HGH dosing.