Steroid isolation , depending on context, is the isolation of chemical matter required for chemical structure elucidation, derivitzation or degradation chemistry, biological testing, and other research needs (generally milligrams to grams, but often more  or the isolation of "analytical quantities" of the substance of interest (where the focus is on identifying and quantifying the substance (for example, in biological tissue or fluid). The amount isolated depends on the analytical method, but is generally less than one microgram.  [ page needed ] The methods of isolation to achieve the two scales of product are distinct, but include extraction , precipitation, adsorption , chromatography , and crystallization . In both cases, the isolated substance is purified to chemical homogeneity; combined separation and analytical methods, such as LC-MS , are chosen to be "orthogonal"—achieving their separations based on distinct modes of interaction between substance and isolating matrix—to detect a single species in the pure sample. Structure determination refers to the methods to determine the chemical structure of an isolated pure steroid, using an evolving array of chemical and physical methods which have included NMR and small-molecule crystallography .  : 10–19 Methods of analysis overlap both of the above areas, emphasizing analytical methods to determining if a steroid is present in a mixture and determining its quantity. 
Finally, specific advice. If you are looking to juice for the first time, don’t get too complicated! I hear of people going out the first time and running 5 different drugs.. That’s crazy; there’s simply no need to do that, you can only grow so fast and there’s not much gained (except risk) by going poly drug. A great 8-12 week cycle for most men is 500mgs/wk of testosterone and .5 to 1mg 3X a week of Arimidex (depending on how you feel). That’s it. No need to over complicate things! Also, you need to get over any fear of needles. Oral steroids are ALL DANGEROUS because they need to go through your liver, and, because of that, they all stress your body a lot more than injections. It’s not that bad, I’ve been doing it 2X a week for years, you get used to it. Not the highlight of my day, but no worse than a lot of other things! If you just want to be sterile, 250mgs/wk of testosterone with .5 Arimidex 3X a week will do it for most men. That’s a high TRT dose, and will make most steroid newbies grow pretty well; but it’s low enough that most people can stay on it indefinitely. Oh, and, one other thing.. Get some Rogaine. 😉 That’s a real negative side effect of steroids, if you’re predisposed to male pattern baldness, steroids WILL accelerate the hair loss. Rogaine (or Propecia, if you can stand the sides) helps immensely.