Sustanon 100

What is Sustanon 100 (different name)

• Brand name: Sustanon 100 (by Organon).

• Type: Injectable testosterone blend.

• Composition per 1 mL ampule:

  • Testosterone Propionate 20 mg (short ester)

  • Testosterone Phenylpropionate 40 mg (medium ester)

  • Testosterone Isocaproate 40 mg (medium/long ester)

This was the “lighter” version of the better-known Sustanon 250 (which has 4 esters totaling 250 mg). Sustanon 100 was intended for testosterone replacement therapy at a lower dose.

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Benefits

• Provides both fast-acting and medium-acting testosterone in one shot.

• Maintains more stable testosterone levels than using a single ester.

• Restores normal androgen levels in hypogonadal men.

• In athletes, it can increase muscle mass, strength, and libido (off-label).

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Side Effects

Same as other testosterone esters because it’s just testosterone in different forms:

• Androgenic: oily skin, acne, hair loss (in predisposed individuals), increased body hair.

• Estrogenic: water retention, gynecomastia (from aromatization to estradiol).

• Cardiovascular/metabolic: changes in cholesterol, increased hematocrit.

• Endocrine: suppression of endogenous testosterone production.

• Injection site: mild pain or irritation.

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Pros and Cons

Pros:

• Combination of esters means fewer injections than pure propionate but faster onset than pure enanthate/cypionate.

• Long clinical track record.

Cons:

• Discontinued in many countries.

• You’re still getting aromatization and DHT conversion, so side effects are essentially the same as any testosterone ester.

• Because it’s only 100 mg per ampule, frequent injections are needed for supraphysiologic bodybuilding doses.

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Dosage & Frequency (therapeutic vs. off-label)

• Therapeutic: 1 mL IM every 1–3 weeks (as originally prescribed).

• Athletic/off-label: often much higher or more frequent, but that raises side-effect risk; no official guidance exists for this.

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Half-Life & Detection Time

• The mix gives a biological half-life ~4–7 days overall (propionate ~2 days, phenylpropionate ~4.5 days, isocaproate ~7 days).

• Detection time (anti-doping): testosterone esters can leave metabolites detectable for weeks. After a single injection you can still test positive for 3–6 weeks depending on dose and testing sensitivity.

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Sterogenic / Progestrogenic / Prolactin Effects

• Sterogenic/androgenic: yes (testosterone is the archetypal androgen).

• Progestogenic: no—testosterone itself has virtually no progestin activity.

• Prolactin: no direct effect, but higher estrogen from aromatization can secondarily elevate prolactin in some individuals.

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Anabolic : Androgenic Ratio

For testosterone (the only active hormone here):

• Anabolic:Androgenic ratio ≈ 100:100 (1:1)

This ratio is intrinsic to testosterone itself; changing the ester doesn’t change the anabolic/androgenic potency, just the release pattern.