Winstrol - Oral versus Injectable (More Different Than You Think!)

by Anthony Roberts
Author of Anabolic Steroids: Ultimate Research Guide and Beyond Steroids; Co-Author with Christian Thibaudeau of Dr. Jekyll and Mr. Hyde - Body Transformation From Both Sides of the Force

Anthony Roberts has been researching anabolic steroids for over a decade. He recently began formulating dietary supplements for bodybuilder. The first is MyoGenX - a natural testosterone booster developed by world famous steroid guru Anthony Roberts. MyoGenX contains a three pronged attack scientifically proven to increase your testosterone levels - which will in turn increase your lean muscle mass, boost your strength, and burn your fat!

Publication Date: June, 2006

Discussion of pharmaceutical agents below is presented for information only. Nothing here is meant to take the place of advice from a licensed health care practitioner. Consult a physician before taking any medication.

I tend to shy away from straight “information” articles- in other words, I’ve never written the “How Androgens Work” article, because I’ve read it several times by several authors, and I really have nothing to add. Gene Transcription and Androgen Receptor Action has been written about over, and over, ad nauseum. All of the articles I’ve read on the topic are well written and well- they’re all the same. Don’t get me wrong, all of the articles which discuss the topic are very informative, but when you’re done reading them, you don’t really have anything you can “use” in your next cycle.

And I’m sure you know the difference between orals and injectables, but do yourself a favor and read this article, because I’m going to explain some things in here that you can use in your next cycle. Actually, I’m going to explain how you can use Winstrol (Stanozolol) as either an oral or injectable, and get a very different set of effects from the same drug- depending on which route of administration you choose to utilize.

First, lets go over the basics of Winstrol, so we’re all on the same page here.

Winstrol is a steroid derived from the base structure of Dihydrotestosterone (DHT). DHT is just testosterone which has been 5alpha-reduced, meaning it has had the c4-5 double bond removed by two hydrogen atoms. This is very interesting from a chemical/biological standpoint. Once this bond is removed, testosterone has become DHT, and DHT is the body’s most potent androgen. DHT has a slew of beneficial effects which are more pronounced than the hormone it’s created out of. DHT is able to increase androgen receptor proliferation for almost 24 full hours (1) DHT also has profound effects on the Central Nervous System (CNS), and this is why we often see profoundly increased aggression with athletes who are using DHT derivatives such as Masteron (which has a deceivingly low anabolic and androgenic rating). As an added benefit, DHT can not aromatize (convert via the aromatase enzyme) into estrogen. It’s also noteworthy that the injectable version of Winstrol is actually the same exact thing as the oral- it’s just micronized Stanozolol  powder suspended in water (or sometimes oil).

So what we have in Winstrol is DHT with two modifications- an added c17 methylation, and a very weird “pyrazol” group. The c17 methylation has been added in order to allow Winstrol to survive oral ingestion and the subsequent first pass through the liver. The pyrazol group is a bit weirder- what this means to you and I is that it has another whole “ring” attached to the four ring Steran Nucleus of DHT. Take a look over at the lower left portion of the two molecules below, and you’ll notice that Winstrol has an added cyclopentane (5 sided) group (the pyrazol group):

DHT	Winstrol

When we really take a look at Winstrol, the anabolic rating of this product is very high (320% that of testosterone) as compared to its androgenic actions (30% of testosterone). Despite this, Winstrol is really a disappointing drug for size gains. What we typically see with this stuff is some pretty decent strength gains and some nice fat loss if the user isn’t too sloppy with their diet. Not many people report huge weight gains off of Stanozolol. Although many drugs which bind tightly to the androgen receptor are suspected to exhibit their at least some of their lipolytic (fat-burning) effects through receptor binding affinity.  The effects of androgens on the regulation of lipolysis in adipose precursor cells.(2), Winstrol remains a potent cutting drug, despite the fact that it has a relatively weak AR binding ability (3). What this tells me is that there’s some stuff going on with regards to Winstrol’s mechanism of action, which doesn’t involve androgen receptor mediated effects. Still, Winstrol is a very potent compound for enhancing protein synthesis (4-5 ) .

As previously discussed, it’s derived from DHT, and DHT is known to have ant-estrogenic effects (6) and Winstrol itself also has anti-progestenic properties (in at least some cases, where it may "block" that receptor) (7). So I think it’s safe to say that some of the “hard” look you can get in your physique from Winstrol is because of it’s ability to inhibit estrogen and progesterone- known culprits in making a physique appear smooth. Unfortunately, since it is 17aa, it is also liver toxic, especially more so when you inject it and it is subject to what is known as the “first pass” through the liver. The difference between taking oral vs. injectable Winstrol, even though it’s technically the same drug, is how and when your body metabolizes it. When you consume a drug orally, that drug is absorbed from the Gastrointestinal tract, where it then passes via the portal vein into the liver -where some drugs are metabolised. This “first pass” can mean that only a certain portion of the drug reaches your body’s bloodstream. As previously discussed, a 17aa has been attached to Winstrol to allow a sizeable portion to survive this metabolism.

First pass metabolism can occur in both the gut and the liver, and where this happens can vary with different drugs. First pass metabolism actually occurs in your gut for some drugs and in the liver for others. Once it has been metabolized, it enters the bloodstream. It’s important to note that when a blood is metabolized in the Gastrointestinal tract, the blood leaving the Gastrointestinal tract does not go right to the heart, but actually still passes through liver via the hepatic portal vein and then ultimately returns to circulation via the hepatic vein. The liver is your body’s filtration unit, and removes large quantities of nutrients, dangerous toxins (or fun toxins, depending on what they are) and other substances from the blood.

So as you can see, when you take an oral steroid such as Winstrol, undergoes a first-pass metabolism in the both the intestines as well as liver. Some drugs can be absorbed more or less totally intact, after only moderate metabolic activity, while some are absorbed only after very extensive metabolic activity. Once it is through this first pass, a given drug then circulates in the blood until it is acquired by another tissue, such as skeletal muscle. Now, if the drug reaches the liver again, it may undergo what is cleverly known as “second-pass” metabolism. Of course, in the case of Winstrol, an injectable version is available, and when we compare the oral and injectable versions of Winstrol and their effects in your body, I think there’s some surprising differences. The injectable is (naturally) put right into your bloodstream and only undergoes the far less extensive second pass metabolism, while the oral must endure the gut and liver on it’s first pass before ending up in circulation.

Now, here’s the interesting part: When you inject Winstrol, instead of taking it orally, you actually get more nitrogen retention (4) (and hence we can infer, more new muscle tissue is being built). SO if you are trying to use Winstrol to build new muscle tissue, the injectable version is going to be far superior to the Oral version. However, there are some advantages that the oral version has over the injectable, including a possible “synergy” with other drugs- but only (primarily) when taken orally.

While in the liver, on it’s first pass, Winstrol is exposed to a variety of enzymes and proteins. To understand how a possible synergy between Winstrol and other steroids may be possible, a little background on Sex Hormone Binding Globulin (SHBG) is first necessary. For our purposes here, all we need to know is that SHBG is a glycoprotein produced in the liver, which binds to testosterone and makes it biologically unavailable to do all the things we want it to do- like building muscle. It serves to transport testosterone throughout the body, but while it remains bound to testosterone, the testosterone can not exert it’s anabolic effects.

As you can surmise, a very large portion of the testosterone in your body is bound to SHBG. Wouldn’t it be great if we could lower SHBG? With Winstrol we can.

A fairly conservative oral dose of .2mg/kg of Winstrol has been shown to lower SHBG by close to 50%. (8)For me (200lbs) this would mean I would only need around 18mgs/day to free up half of my SHBG bound testosterone! For my omnipresent and hypothetical “100kg bodybuilder”- only 20mgs would be needed (he’s 220 lbs for the metrically impaired among us). Now, with less SHBG floating around in me, my anabolic steroid cycle will be more effective, right? Right.

But why can we only expect such a dramatic lowering of SHBG with the oral? Well, obviously, we’re taking advantage of the first pass through the liver, where we can have our Winstrol interact with SHBG where it’s produced- in the liver…without going through the bloodstream first.

When we take a look at a study done comparing injectable vs. oral contraceptives, we find that the oral version at 70mgs/week (10mgs/day given orally) is more effective at affecting SHBG levels than 400mgs/week given via an injection! (9)In this study, testosterone undecanoate was given at a constant dose along with norestisterone (which raises SHBG). What we see is that when norestisterone is given orally, it produces a far greater effect on SHBG, than when it is administered via an injection. And this is even when the doses of the injectable are 4x higher!

Here’s a chart, illustrating exactly what I’m talking about in this study, which I think suggests very strongly that injectable versions of drugs, when compared with the oral version, will have nowhere near as much of an effect on SHBG: