Bisphosphonates are incorporated into the bone matrix, from which they are gradually released over a period of years. The amount of bisphosphonate incorporated into adult bone, and hence, the amount available for release back into the systemic circulation , is directly related to the dose and duration of bisphosphonate use. There are no data on fetal risk in humans. However, there is a theoretical risk of fetal harm, predominantly skeletal, if a woman becomes pregnant after completing a course of bisphosphonate therapy. The impact of variables such as time between cessation of bisphosphonate therapy to conception , the particular bisphosphonate used, and the route of administration (intravenous versus oral) on the risk has not been studied.
The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine . 
The shadow contains for each of us the parts of the personality that are hidden from us – we are often encouraged to turn away from shadow aspects of self by family, teachers, society, and cultural or religious institutions who themselves are uncomfortable with their shadows. The shadow isn’t bad, however, it’s just human, and as Bly points out, the less we acknowledge it, the larger it grows. Much as we would like to leave it behind, it is part of us and will follow us everywhere. When we embark on a plan of lifestyle change, shadow elements appear to whisper in our ears, urging us to do the very thing we have firmly resolved not to do: smoke a cigarette, take a drink, or eat that humongous piece of chocolate cake that has been beckoning us all evening. This urge to sabotage our highest and healthiest intentions has been termed the “counter intention” by the life-coach Joe Vitale, and to persist in the work of successful lifestyle change we must engage with our counter intentions and shed light on our shadow. Dialogue processes (such as Voice Dialogue techniques), journaling, working with a life-coach or therapist, and group support can give us tools to explore the underpinnings of such resistance to positive change.