混合睾酮，是一种新型激素类预混剂，它是根据各种药物的药理作用时间不同混合而成。从而弥补了药物的作用时间，使药物能更快更持久的作用。
主要成分：丙酸睾酮，苯丙睾丸酮，睾酮，睾酮癸酸。
一种是粉剂，以一公斤混合睾酮为例：其中包含丙酸睾酮120克，苯丙睾丸酮240克，睾酮240克，睾酮癸酸400克于一体，是一种新型原料药。
另一种是250毫克油基睾酮注射液：丙酸睾丸酮30毫克；睾酮苯丙60毫克；睾酮为60 毫克和睾酮癸酸100毫克。剂量的范围从250毫克每一周，直至2000年毫克或每周更多。这些剂量似乎是极端。更常见的用量将范围从250毫克至1000毫克每星期。虽然仍然有效的时间长达一个月，注射应至少每星期一次的睾丸激素水平保持稳定。
SUSTANON 250 (testosterone blend)
Pharmaceutical Name: Sustanon 250
Chemical Name: Testosterone Propionate, Phenylpropionate, Isocaproate and Decanoate
Unit Available:10 ml.
Each ml. contain: 250 mg.
Sustanon 250 is an oil-based injectable testosterone blend that contains four different testosterone esters: testosterone propionate (30 mg); testosterone phenylpropionate (60 mg); testosterone isocaproate (60 mg); and testosterone decanoate (100 mg). Sustanon is designed to provide a fast yet extended release of testosterone, usually requiring injections once every 3 to 4 weeks in a clinical setting. This is an improvement from standard testosterones such as cypionate or enanthate, which provide a shorter duration of activity. As with all testosterone products, Sustanon 250 is a very strong anabolic drug with pronounced androgenic activity. lt is most commonly used in bulking cycles, providing exceptional gains in strength and muscle mass. A shorter acting version of Sustanon, called Sustanon 100, is also made in certain areas.
Structural Characteristics
Sustanon 250 contains a mixture of four testosterone compounds, which where modified with the addition of carboxylic acid esters (propionic, propionic phenyl ester, isocaproic, and decanoic acids) at the i7-beta hydroxyl group. Esterified forms of testosterone are less polar than free testosterone, and are absorbed more slowly from the area of injection. Once in the bloodstream, the ester is removed to yield free (active) testosterone. Esterilied forms of testosterone are designed to prolong the window of therapeutic effect following administration, allowing for a less frequent injection schedule compared to injections of free (unesterified) steroid. Sustanon 250 is designed to provide a rapid peak in testosterone levels (24-48 hours after injection), and maintain physiological concentrations for approximately 21 days. Each 250 mg provides 176mg of testosterone.
Dosage Recommanded
Testosterone propionate is often regarded as a painful lnjection. This is due to the very short carbon chain of the propionic acid ester, which can be irritating to tissues at the site of injection. Many sensitive individuals choose to stay away from this steroid completely, their bodies reacting with a pronounced soreness and lovwgrade fever that may last for a few days after each injection.
To treat androgen insufficiency, the prescribing guidelines for Sustanon 250 call for a dosage of 250 mg every 3 weeks. Although active in the body for a longer time, Sustanon 250 is usually injected every 7 to 10 days for muscle-building purposes.This schedule will allow for the higher doses most commonly applied by athletes, and more stable elevations in hormone level.The usual dosage among male athletes is in the range of 250-750 mg per injection, taken in cycles 6 to 12 weeks in length.This level is suflicient for most users to notice exceptional gains in muscle size and strength.
Sustanon 250 is usually incorporated into bulking phases of training, when added water retention will be of little consequence, the user more concerned with raw mass than definition. Some do incorporate this drug into cutting cycles as well, but typically in lower doses (125-250 mg every 7-10 days) and/or when accompanied by an aromatase inhibitor to keep estrogen levels under control. Sustanon 250 is a very effective anabolic drug, and is often used alone with great benefit. Some, however, find a need to stack it with other anabolic/androgenic steroids for a stronger effect, in which case an additional 200-400 mg per week of boldenone undecylenate, methenolone enanthate, or nandrolone decanoate should provide substantial results with no significant hepatotoxicity. Testosterone is ultimately very versatile, and can be combined with many other anabolic/androgenic steroids to tailor the desired effect.
Some bodybuilders have been known to use excessively high dosages of this drug (1,000 mg per week or more), although this practice is generally not advised. At dosages above 750 mg per week, water retention will likely account for more of the additional weight gain than new muscle tissue. The practice of  "megadosing” is inefficient (not to mention potentially dangerous), especially when we take into account the typical high cost of Sustanon 250. Such use is usually not justified outside of aggressive bodybuilding regimens.
Side Effects
All anabolic/androgenic steroids when taken in doses sufficient to promote muscle gain are expected to suppress endogenous testosterone production. Testosterone is the primary male androgen, and offers strong negative feedback on endogenous testosterone production.Testosterone based drugs will, likewise, have a strong effect on the hypothalamic regulation of natural steroid hormones. Without the intervention of testosteronestimulating substances, testosterone levels should return to normal within 1-4 months of drug secession. Note that prolonged hypogonadotrophic hypogonadism can develop secondary to steroid abuse, necessitating medical intervention
Systematic name : 4-androsten-3-one-17beta-ol 17beta-hydroxy-androst-4-en-3-one

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