Step 1
Medical intake
Answer a guided set of questions covering your medical history, current medications, goals, and treatment preferences.
A few minutes
Testosterone esters in oil are absorbed slowly from the injection site, producing a peak within days and a gradual decline over the following week — the pattern that defines the dosing interval.
Testosterone Cypionate (CA)
Testosterone Cypionate Injection (CA)
From $129/mo*
Duration
The long-standing injectable form of testosterone replacement. An oil-based ester that releases slowly, which is why it is dosed weekly rather than daily.
Supports
Get Started
Confirmed diagnosis requiredOngoing lab monitoring
HSA/FSA reimbursable
No Membership Required
Licensed US Pharmacies
Testosterone is FDA-approved and a Schedule III controlled substance. Prescribed only for clinically diagnosed low testosterone confirmed by lab testing. Telehealth prescribing permitted through December 31, 2026, subject to state law.
Fast, discreet shipping
Unlimited follow-up with licensed physicians
Testosterone esters in oil are absorbed slowly from the injection site, producing a peak within days and a gradual decline over the following week — the pattern that defines the dosing interval.
THE ESTER
The oil is the timing mechanism. Not the hormone.
Same total dose, different interval.
Behre & Nieschlag, Testosterone: Action, Deficiency, Substitution, Cambridge University Press
Weekly
Every two weeks
Illustrates dosing-interval patterns for the same total weekly dose. Actual levels vary by individual; dosing is adjusted against bloodwork.
HOW CYPIONATE WORKS
A slow-release form of the same hormone.
Testosterone cypionate is testosterone with a cypionate ester attached, suspended in oil. Injected into muscle or subcutaneous tissue, it releases gradually as enzymes cleave the ester. What enters circulation is testosterone; the ester simply controls the timing.
Ester controls release rate
The cypionate ester slows absorption from the injection site, which is what makes weekly rather than daily dosing practical.
Weekly dosing reduces swing
Smaller weekly doses produce less variation between peak and trough than larger doses given every two weeks.
Suppresses natural production
External testosterone reduces the pituitary's LH and FSH signal, which can reduce sperm production and testicular size.
Monitored on a schedule
Testosterone, estradiol, hematocrit, and PSA are followed throughout treatment, with hematocrit the most common reason for adjustment.
HOW PEPTRA WORKS
From intake to your door in three to seven days
Prescription medicine from board-certified physicians, shipped to your door.
Step 2
Doctor review
A U.S.-licensed, board-certified physician reviews your intake and recommends a medication, if appropriate.*
Within 72 hours
Step 3
Fast shipping
Approved medications ship directly to your door in discreet packaging.
2-5 business days
Step 4
Unlimited messaging
Your doctor is available via chat any time for additional support. Video consults available.
Up to 12 months
Prescription medicine from board-certified physicians, shipped to your door.
*Some states may require a synchronous audio and/or video consultation prior to a prescription being approved.
WHY PEPTRA MEDICINE
Precision medicine protocols to support longevity
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Proactive care
Doctor-led treatment plans designed around your goals. No wait lists. No insurance required.
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Transparent pricing
No membership fees, no hidden costs. You pay only after a doctor prescribes treatment.
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Board-certified doctors
Access to specialist physicians, licensed in your state. Unlimited messaging for up to 12 months.
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Curated by longevity experts
Every protocol is built by medical experts, based on longevity research from Our founder's science team.
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COMMON QUESTIONS
Questions, answered
Who is testosterone cypionate for?
Why weekly instead of daily?
How is it monitored?
Disclaimer: This page is intended for educational purposes only and is not intended to provide medical advice, diagnosis or treatment. Medication eligibility and prescriptions are determined solely by licensed medical providers based on clinical appropriateness. Not all individuals will qualify for medication-based treatment. Always consult a licensed healthcare professional before beginning any wellness program.