Otokonoko Estradiol Cypionate

  • Group:
  • Dosage form:
    Injection
  • Manufacturer:
    Otokonoko Pharmaceuticals
  • Active ingredient:
    Estradiol Cypionate
  • Excipients:
    MCT Oil (Supension Oil)
    Benzyl Benzoate (Solvent)
    Benzyl Alcohol (Preservative)
  • Volume:
    10 ml
  • Total active ingredient:
    400 mg
  • Concentration:
    40.0 mg/ml
Lab Tests

  • Ordered by:
    Trans Harm Reduction
  • Test date:
    26/06/2023
  • Advertised Concentration:
    40.0 mg/ml
  • Tested Concentration:
    39.58 mg/ml
  • No Contaminants Detected:
  • Sample contained 39.58mg/ml of estradiol cypionate and 1.37mg/ml of estradiol valerate.
  • View report

Estradiol Cypionate is an estered form of bioidentical estradiol suspended in an oil solution making it suitable for subcutaneous and intramuscular injections. Esterification is the process of combining the Estradiol with an acid which the human body will then slowly breakdown over time, creating a slow-release form of the medication so that it can be delivered as larger injections at lower frequences, typically around weekly. Estradiol has been delivered in this form for almost a century and it's a well studied, safe and convenient process. Estradiol Cypionate has a biological half life of ~11 days.

Estradiol Cypionate is an estered form of bioidentical estradiol suspended in an oil solution making it suitable for subcutaneous and intramuscular injections. Esterification is the process of combining Estradiol with an acid which the human body will then slowly break down over time, creating a slow-release form of the medication so that it can be delivered as larger injections at lower frequencies, typically around weekly. Estradiol has been delivered in this form for almost a century and it's a well-studied, safe and convenient process. Estradiol Cypionate has a biological half-life of ~11 days.

Unlike many other medications on this site, these products are produced by private individuals, not pharmaceutical companies, and thus do not have the associated safety guarantees. While we only list providers with a positive reputation within the DIY community it's important to understand these risks so that you can make an informed decision.

This product is 10ml of liquid, at a concentration of 40mg per ml, for a total of a 400mg per vial.

Price History
Otokonoko Pharmacy $85.00 In Stock
USD per mg

Jun 16, 2026 $85.00 In Stock
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