Depo-Testosterone — testosterone cypionate

Testosterone cypionate is a slow-acting injectable ester of the primary male androgen testosterone. Testosterone is also the principle anabolic hormone in men, and is the basis of comparison by which all other anabolic/androgenic steroids are judged. As with all testosterone injectables, testosterone cypionate is highly favored by athletes for its ability to promote strong increases in muscle mass and strength. It is interesting to note that while a large number of other steroidal compounds have been made available since testosterone injectables, they are still considered to be the dominant bulking agents among bodybuilders. There is little argument that these are among the most powerful mass drugs available, testosterone cypionate included.

Brand name Depo-Testosterone, Testosterone cypionate, Depot-Testosterone, Cypionax, Cypiobolic, Testex prolongatum, Ciclo-6, Testosterona C
Androgenic 100
Anabolic 100
Standard Standard
Chemical Names 4-androsten-3-one-17beta-ol
Estrogenic Activity moderate
Progestational Activity low

Testosterone Cypionate History

Testosterone cypionate first appeared on the U.S. drug market during the mid-1950’s under the brand name of Depo-Testosterone cyclopentylpropionate (soon abridged to simply Depo-Testosterone). It was developed by the pharmaceutical giant Upjohn, and is still sold to this day by the same company under the same trade name (although now they are called Pharmacia & Upjohn). This is a drug with limited global availability, and has historically been (largely) identified as an American item. It is not surprising that American athletes have long favored this form of testosterone over testosterone enanthate, the dominant slow-acting ester of testosterone on the global market. This preference, however, is likely rooted in history and availability, not actual therapeutic advantages.

Testosterone cypionate and testosterone enanthate provide extremely comparable patterns of testosterone release. Not only are physical advantages not possible in one over the other, but actual differences in pharmacokinetic patterns are hard to notice (these two drugs are for all intents and purposes functionally interchangeable). The only key difference between the two seems to be in the area of patient comfort. Cypionic acid is less irritating at the site of injection than enanthoic acid (enanthate) for a small percentage of patients. This makes testosterone cypionate a more favorable choice for those with recurring issues of injectionsite pain with testosterone enanthate. This difference likely had something to do with the early development of this testosterone ester as a commercial drug product.

The main use of testosterone cypionate in clinical medicine has historically been the treatment of low androgen levels in males, although many other applications have existed for this drug as well. During the 1960’s, for example, the drug’s prescribing recommendations called for such uses as supporting bone structure maturity, treating menorrhagia (heavy menstrual bleeding) and excessive lactation in females, and increasing muscle mass and combating osteoporosis in the elderly. It was also being recommended for increasing male fertility, whereby induced testosterone/spermatogenesis suppression (caused by administering 200 mg of testosterone cypionate per week for 6 to 10 weeks) was potentially followed by a period of rebound spermatogenesis (due to temporarily higher than normal gonadotropin levels).

By the 1970’s, the FDA had been granted much stronger control over the prescription drug market, and the broad uses in which testosterone cypionate was first indicated were now being refined. For example, “testosterone rebound therapy” as a way to increase male fertility was proving to be unreliable, especially in the face of newer more effective medications, and was soon eliminated from prescribing guidelines. So too was the recommendation for its use to treat things like excessive menstrual bleeding and lactation. In general, testosterone therapy was being pulled back to focus mainly on male androgen deficiency, and less on other applications, especially when involving populations more susceptible to androgenic side effects, such as women and the elderly.

Today, testosterone cypionate remains readily available on the U.S. prescription drug market, where it is FDA-approved for hormone replacement therapy in men with conditions associated with a deficiency of endogenous testosterone, and as a secondary treatment for inoperable metastatic breast cancer in women (although it is not widely used for this purpose anymore). Testosterone cypionate is currently available outside of the United States, but not widely. Known international sources for the drug include Canada, Australia, Spain, Brazil, and South Africa.

How is Testosterone Cypionate Supplied

Testosterone cypionate is available in select human and veterinary drug markets. Composition and dosage may vary by country and manufacturer, but usually contain 50 mg/ml, 100 mg/ml, 125 mg/ml, or 200 mg/ml of steroid dissolved in oil.

Structural Characteristics of Testosterone Cypionate

Testosterone cypionate is a modified form of testosterone, where a carboxylic acid ester (cyclopentylpropionic acid) has been attached to the 17-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. Esterified 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. The half-life of testosterone cypionate is approximately 8 days after injection.

Testosterone Cypionate Side Effects (Estrogenic)

Testosterone is readily aromatized in the body to estradiol (estrogen). The aromatase (estrogen synthetase) enzyme is responsible for this metabolism of testosterone. Elevated estrogen levels can cause side effects such as increased water retention, body fat gain, and gynecomastia. Testosterone is considered a moderately estrogenic steroid. An anti-estrogen such as clomiphene citrate or tamoxifen citrate may be necessary to prevent estrogenic side effects. One may alternately use an aromatase inhibitor like Arimidex (anastrozole), which effects. One may alternately use an aromatase inhibitor like Arimidex (anastrozole), which more efficiently controls estrogen by preventing its synthesis. Aromatase inhibitors can be quite expensive in comparison to anti-estrogens, however, and may also have negative effects on blood lipids.

Estrogenic side effects will occur in a dose-dependant manner, with higher doses (above normal therapeutic levels) of testosterone cypionate more likely to require the concurrent use of an anti-estrogen or aromatase inhibitor. Since water retention and loss of muscle definition are common with higher doses of testosterone cypionate, this drug is usually considered a poor choice for dieting or cutting phases of training. Its moderate estrogenicity makes it more ideal for bulking phases, where the added water retention will support raw strength and muscle size, and help foster a stronger anabolic environment.

Testosterone Cypionate Side Effects (Androgenic)

Testosterone is the primary male androgen, responsible for maintaining secondary male sexual characteristics. Elevated levels of testosterone are likely to produce androgenic side effects including oily skin, acne, and body/facial hair growth. Men with a genetic predisposition for hair loss (androgenetic alopecia) may notice accelerated male pattern balding. Those concerned about hair loss may find a more comfortable option in nandrolone decanoate, which is a comparably less androgenic steroid. Women are warned of the potential virilizing effects of anabolic/androgenic steroids, especially with a strong androgen such as testosterone. These may include deepening of the voice, menstrual irregularities, changes in skin texture, facial hair growth, and clitoral enlargement.

In androgen-responsive target tissues such as the skin, scalp, and prostate, the high relative androgenicity of testosterone is dependant on its reduction to dihydrotestosterone (DHT). The 5-alpha reductase enzyme is responsible for this metabolism of testosterone. The concurrent use of a 5-alpha reductase inhibitor such as finasteride or dutasteride will interfere with site-specific potentiation of testosterone action, lowering the tendency of testosterone drugs to produce androgenic side effects. It is important to remember that anabolic and androgenic effects are both mediated via the cytosolic androgen receptor. Complete separation of testosterone’s anabolic and androgenic properties is not possible, even with total 5-alpha reductase inhibition.

Testosterone Cypionate Side Effects (Hepatotoxicity)

Testosterone does not have hepatotoxic effects; liver toxicity is unlikely. One study examined the potential for hepatotoxicity with high doses of testosterone by administering 400 mg of the hormone per day (2,800 mg per week) to a group of male subjects. The steroid was taken orally so that higher peak concentrations would be reached in hepatic tissues compared to intramuscular injections. The hormone was given daily for 20 days, and produced no significant changes in liver enzyme values including serum albumin, bilirubin, alanine-amino-transferase, and alkaline phosphatases.

Testosterone Cypionate Side Effects (Cardiovascular)

Anabolic/androgenic steroids can have deleterious effects on serum cholesterol. This includes a tendency to reduce HDL (good) cholesterol values and increase LDL (bad) cholesterol values, which may shift the HDL to LDL balance in a direction that favors greater risk of arteriosclerosis. The relative impact of an anabolic/androgenic steroid on serum lipids is dependant on the dose, route of administration (oral vs. injectable), type of steroid (aromatizable or non-aromatizable), and level of resistance to hepatic metabolism. Anabolic/androgenic steroids may also adversely affect blood pressure and triglycerides, reduce endothelial relaxation, and support left ventricular hypertrophy, all potentially increasing the risk of cardiovascular disease and myocardial infarction.

Testosterone tends to have a much less dramatic impact on cardiovascular risk factors than synthetic steroids. This is due in part to its openness to metabolism by the liver, which allows it to have less effect on the hepatic management of cholesterol. The aromatization of testosterone to estradiol also helps to mitigate the negative effects of androgens on serum lipids. In one study, 280 mg per week of testosterone ester (enanthate) had a slight but not statistically significant effect on HDL cholesterol after 12 weeks, but when taken with an aromatase inhibitor a strong (25%) decrease was seen. Studies using 300 mg of testosterone ester (enanthate) per week for 20 weeks without an aromatase inhibitor demonstrated only a 13% decrease in HDL cholesterol, while at 600 mg the reduction reached 21%. The negative impact of aromatase inhibition should be taken into consideration before such drug is added to testosterone therapy.

Due to the positive influence of estrogen on serum lipids, tamoxifen citrate or clomiphene citrate are preferred to aromatase inhibitors for those concerned with cardiovascular health, as they offer a partial estrogenic effect in the liver. This allows them to potentially improve lipid profiles and offset some of the negative effects of androgens. With doses of 600 mg or less per week, the impact on lipid profile tends to be noticeable but not dramatic, making an anti-estrogen (for cardioprotective purposes) perhaps unnecessary. Doses of 600 mg or less per week have also failed to produce statistically significant changes in LDL/VLDL cholesterol, triglycerides, apolipoprotein B/C-III, C-reactive protein, and insulin sensitivity, all indicating a relatively weak impact on cardiovascular risk factors. When used in moderate doses, injectable testosterone esters are usually considered to be the safest of all anabolic/androgenic steroids.

To help reduce cardiovascular strain it is advised to maintain an active cardiovascular exercise program and minimize the intake of saturated fats, cholesterol, and simple carbohydrates at all times during active AAS administration. Supplementing with fish oils (4 grams per day) and a natural cholesterol/antioxidant formula such as Lipid Stabil or a product with comparable ingredients is also recommended.

Testosterone Cypionate Side Effects (Testosterone Suppression)

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 testosterone-stimulating 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.

As with all anabolic/androgenic steroids, it is unlikely that one will retain every pound of new bodyweight after a cycle is concluded. This is especially true when withdrawing from a strong (aromatizing) androgen like testosterone cypionate, as much of the new weight gain is likely to be in the form of water retention, quickly eliminated after drug discontinuance. An imbalance of anabolic and catabolic hormones during the post-cycle recovery period may further create an environment that is unfavorable for the retention of muscle tissue. Proper ancillary drug therapy is usually recommended to help restore hormonal balance more quickly, ultimately helping the user retain more muscle tissue.

Another way to lessen the post-cycle “crash” is to first replace testosterone cypionate with a milder anabolic such as nandrolone decanoate or methenolone enanthate. The new steroid would be administered alone for one to two more months, at a dosage of 200-400 mg per week. In this “stepping down” procedure the user is attempting to eliminate the watery bulk of a testosterone-based drug while simultaneously preserving the solid muscularity underneath. This practice can prove to be effective, even if mainly for psychological reasons (some may view it as simply dividing the crash into water and hormonal stages). Testosterone-stimulating drugs are still typically used at the conclusion of therapy, as endogenous testosterone production will not rebound during the administration of nandrolone decanoate or methenolone enanthate.

Testosterone Cypionate Administration (Men)

To treat androgen insufficiency, the prescribing guidelines for testosterone cypionate call for a dosage of 50-400 mg every two to four weeks. Although active in the body for a longer time, testosterone cypionate is usually injected on a weekly basis for physique- or performance-enhancing purposes. The usual dosage is in the range of 200-600 mg per week, taken in cycles 6 to 12 weeks in length. This level is sufficient for most users to notice exceptional gains in muscle size and strength.

Testosterone 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 the drug into cutting cycles as well, but typically in lower doses (100- 200 mg per week) and/or when accompanied by an aromatase inhibitor to keep estrogen levels under control. Testosterone cypionate 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.

While large doses are generally not advised, some bodybuilders have been known to use excessively high dosages of this drug (1,000 mg per week or more). This was much more common before the 1990’s, when cypionate vials were usually very cheap and easy to find. A “more is better” attitude is easy to justify when paying only $20 for a 10cc vial (today the typical price for a single injection). At dosages of 800-1000 mg per week or more, 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 steroids today.

Testosterone Cypionate Administration (Women)

Testosterone cypionate is rarely used with women in clinical medicine. When applied, it is most often used as a secondary medication during inoperable breast cancer, when other therapies have failed to produce a desirable effect and suppression of ovarian function is necessary. Testosterone cypionate is not recommended for women for physique- or performance-enhancing purposes due to its strong androgenic nature, tendency to produce virilizing side effects, and slow-acting characteristics (making blood levels difficult to control).

Testosterone Cypionate Availability

Testosterone cypionate remains widely available as a prescription drug product. Its production is largely associated with American companies, although recently has been expanding into loosely regulated Asian markets that still cater to demand by bodybuilders and athletes. In reviewing some of the products and changes in the global pharmaceutical market, we have made the following observations.

Brand name testosterone cypionate (Depot-Testosterone) remains available in the United Stated from Prizer. This is a high-profile target of counterfeiters. All legitimate boxes will carry a “Jh” symbol hidden on one of the top inside flaps. It will appear when placed under UV light.

Many generic forms of the drug are also produced in the U.S. market by manufacturers such as Watson, Sandoz, Paddock, Synerx, and Bedford. All come packaged in multiple-dose vials. Due to strict controls these products are rarely diverted for illicit sale. There are also several pharmacies custom-compounding testosterone cypionate for doctors that specialize in androgen replacement therapy.

Cypionax is available in Thailand by T.P. Drug Laboratories. It comes in 2 mL ampules containing 100 mg/mL of steroid.

Cypiobolic from Asia Pharma (Malaysia) is now approved for sale through pharmacies in Thailand. Each box should carry a scratch-off security sticker, which will display a code that can be validated on the company website.

Testex Prolongatum remains available in Spain. This steroid is produced by Laboratorios Q Pharma. It is packaged in 2 mL dark glass ampules with grey silkscreen lettering. It comes in two doses, containing a total of 100 mg or 250 mg of steroid. Testex has always been a high-profile item for counterfeiters.

Found in Chile is a high-dose cypionate product called ciclo-6. The product is manufactured by the firm Drag Pharma, and contains 300 mg/ml of steroid in a 2 mL ampule (600 mg of cypionate in total).

Balkan Pharmaceuticals (Moldova) makes the product Testosterona C. It is prepared in both 1 mL ampules and multi-dose vials.

Testosterone Cypionate is produced by Swiss Remedies and available across Europe. Due to numerous fakes of this product, Swiss Remedies offers a convenient online product checker.

Magnus Pharmaceuticals makes the product Test C primarily for the EU and UK markets. Due to fake products appearing on the market, Magnus offers an online checker that lets steroid users verify their product originality.

Bodybuilders reference

Pretty much all that was written about TESTOSTERONE ENANTHATE also applies to TESTOSTERONE CYPIONATE. A slight distinction was made in that they each provided a notable different half- and active-life period. For this reason, CYPIONATE injections were reduced to every 8th day by some reported users. Dosages of 200-1000mg weekly were common, but most users experienced excellent results with 200-600mg weekly. Both testosterone preparations stacked well with any other AAS and added a distinct androgenic effect. This meant improved regenerative qualities and greater training intensity with a correlating significant increase in weight-load capacity. For those who wished to use testosterone but were highly sensitive to gyno and water retention, TESTOSTERONE PROPIONATE was commonly reported to be the better choice. Oddly enough, a few of those polled reported more sensitively due to Propionate's fast action. Interesting paradox, huh? The issue was simply a matter of dosage/administration protocols. Since PROPIONATE remained active for about 3 days a weekly administration protocol allowed circulatory clearing of the drug. It should be noted that both TESTOSTERONE ENANTHATE and CYPIONATE were said to be more anabolic and less androgenic then SUSPENSION or PROPIONATE. This is pure imagination. The truth is that suspension actually is a faster acting testosterone and contains more total testosterone per 100mg dosage than any esterfied testosterone.

Anabolic Steroid Guide reference

Testosterone cypionate is the most popular and most used testosterone. Cypionate, like enatanthe, is an oil dissolved injectable form of testosterone with strong androgenic and anabolic effects. It aromatizes quite easily which means that the conversion rate to estrogen, similar to enanthate's, is relatively high. Several athletes are of the opinion that cypionate stores more water in the body than enantathe does. The muscle buildup during the application along with the inevitable loss of strength and muscle mass after discontinuing use of one product, are the same with the other. Testosterone cypionate can be combined with many steroids and thus making it an excellent mass steroid. As with enanthate the dosage range is 250-1000 mg/week although several athletes inject megadoses (see Testosterone enanthate).

Almost everything written in this book about Testosterone enanthate can be applied to cypionate. In our opinion most athletes will not notice a difference between the two compounds. Testosterone cypionate is one of the drugs which is most frequently faked. The products by Lemmon, Goldline, and international Pharmaceutical available on the black market are fakes and almost certainly contain no cypionate. The price situation is the same as with Testosterone enanthate. For 1 ml of 200 mg or 250 mg, $ 10 - 15 are being asked and also paid. For further information as to the effects of Testosterone cypionate, see also Testosterone enanthate.

Newbies Research Guide reference

This is an oil based injectable form of testosterone. It is high in androgens and is very anabolic as well. Depo-Testosterone aromatizes quite easily. Water retention is often a problem when this drug is used. It is only moderately toxic to the liver, but can cause a marked disturbance in the body’s endogenous production of testosterone. Depo-test is often a dramatic size and strength building drug. It can be stacked with a number of steroids and come out to be a great bulking cycle. This drug is the most popular testosterone used by athlete.

Although the gains a person can make on testosterone’s are dramatic, the size and strength lost when the drug is stopped is also dramatic for most. This can be compounded by the body’s suppressed endogenous testosterone production. Some users have minimal losses if they take Nolvadex throughout the cycle, come off the drug very slowly, and take HCG right after the cycle. When taken in moderate dosages, its gains can outweigh its down side. Effective dosages for men are in the range of 1cc to 3cc per week, women should not be using any testosterone.


Wlliam Llewellyn (2011) - Anabolics
L. Rea (2002) - Chemical Muscle Enhancement Bodybuilders Desk Reference
Anabolic Steroid Guide
Newbies Research Guide

Your experience with Depo-Testosterone — testosterone cypionate

• Jul 24, 2020

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