Testosterone Cypionate in Grapeseed Oil Injection

Available Dosage Strengths

20 mg/mL (Low Dose)  |  50 mg/mL  |  50 mg/mL

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Product Overview

Testosterone Cypionate in Grapeseed Oil Injection  Description1-6

Testosterone cypionate is a long-acting testosterone ester used in testosterone replacement therapy (TRT) to treat male hypogonadism. Testosterone that has not been esterified has a half-life of as short as 10 minutes.  Testosterone cypionate has a half-life of 8 days. Thus, the esterification process increases the half-life dramatically and it also increases the solubility of the testosterone in oil. Testosterone cypionate in oil provides a more stable and sustained release of testosterone, potentially reducing the frequency of injections and minimizing fluctuations in hormone levels. The oils used pharmaceutically as a vehicle for the testosterone cypionate include cottonseed oil, sesame oil and grapeseed oil. The testosterone can be injected into the muscle or subcutaneously under the skin. Grapeseed oil is thought to be less viscous and less inflammatory than other oils used.

Mechanism of Action1,6

Testosterone cypionate and testosterone enanthate are both esterified forms of testosterone. The esterification occurs on the 17b carbon of the testosterone structure. The esters extend the duration of action and are useful for less frequent, intramuscular, or subcutaneous injections.  Once administered, the esters are cleaved, releasing free testosterone into the bloodstream. Testosterone then binds to androgen receptors in various tissues, exerting anabolic and androgenic effects. These effects may include the development and maintenance of male secondary sexual characteristics, stimulation of muscle and bone growth, and regulation of libido and mood.

Adverse Reactions1

  • Acne
  • Hypertension
  • Injection site pain or inflammation
  • Mood swings or irritability
  • Increased or decreased libido
  • Gynecomastia

Contraindications & Precautions1

Contraindications:

  • Known hypersensitivity to testosterone or either ester component
  • Known hypersensitivity to grapeseed oil
  • Males with carcinoma of the breast or known or suspected carcinoma of the prostate
  • Pregnant or breastfeeding women
  • Patients with serious cardiac, hepatic, or renal disease

Precautions:

  • Monitor hematocrit and hemoglobin levels.
  • Regularly assess liver function tests.
  • Evaluate lipid profiles periodically.
  • Monitor for signs of sleep apnea.
  • Use cautiously in patients with a history of cardiovascular disease.

Store at 20°C to 25°C (68°F to 77°F) in a dry place, away from heat and light. DO NOT REFRIGERATE. Do not freeze. Keep out of reach of children.

  1. Clinical Pharmacology Testosterone clinical monograph accessed May 2025 ; https://www.clinicalkey.com/pharmacology/monograph/595?n=Testosterone  
  2. Pubchem testosterone cypionate. https://pubchem.ncbi.nlm.nih.gov/compound/Testosterone-Cypionate#section=Metabolism-Metabolites. Accessed July 6, 2025
  3. Mayo Clinic. Testosterone cypionate (intramuscular route). https://www.mayoclinic.org/drugs-supplements/testosterone-cypionate-intramuscular-route/description/drg-20563731  
  4. Depo Testosterone(Testosterone Cypionate) [package insert] Pfizer Inc NY, NY 10017, revised July 2018, accessed May 2025 through: https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/085635s040lbl.pdf
  5. Phillips B. Bioidentical Hormone Replacement Therapy (BHRT). https://aliveandwellhealth.com/library/f/subcutaneous-testosterone-injections. Accessed July 8, 2025.
  6. Shoskes JJ, Wilson MK, Spinner ML. Pharmacology of testosterone replacement therapy preparations. Transl Androl Urol. 2016 Dec;5(6):834-843.

This sheet is a summary. It may not cover all possible drug information about this product. Call your doctor for medical advice and/or about side effects. You may report side effects to the FDA at 1-800-FDA-1088.  A Wells Pharmacy Network pharmacist will be happy to answer any questions. For consultation, please call 1-800-622-4510.

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