The most obvious benefit that injectable steroids have over their oral cousins is that they are not hepatotoxic. Injectable steroids are safer on the liver and the user does not risk hepatic injury because injectable compounds don’t require specific chemical alterations which allow them to survive passing through the liver without being broken almost entirely down. It’s also worth consider that injectable steroids have a much longer half-life due to the ester attached to the hormone. To get the maximum benefit from oral steroids, most must be administered daily, or sometimes they are spread out throughout the day. The ester present in injectable steroids allows a much more infrequent administration and don’t need to be administered daily. More information about Esters
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Having said and explained that many of the muscle building properties of GH are mediates by IGF1 which is considered the most anabolic hormone in the body. Even if we block somehow the IGF1 secretion which is induced by GH it'll still retain some of its anabolic and metabolic effects directly through GH receptors in different tissues, but big portion of the effect will be abolished, this is why in rare condition when short statue children don't respond well to GH treatment they're treated with IGF1 (prescribed Increlex- you my refer for some info for instance to https:///forum/hgh-peptides/rhgh/somedin-igf1-lr3-vs-increlex-prescribed-igf1 ). The GH causes IGF1 secretion from target organs such as the liver and kidneys, and the IGF1 travels in the serum to different tissues (endocrine effect). The GH also causes a local section of IGF1 (and other growth factors) on different tissues, mainly on muscle tissue, it's called autocrine effect, and it's responsible on the stimulation of cell division, and this explains some of the unique so desired effect of GH (and IGF1).