In general, all testosterone injections are equal once they cleave from their ester. The rate of the release and the excipients used as a preservative can affect its tolerability by the patient. Allergies to the excipients such as arachis oil, or castor oil would preclude a patient from using such a preparation.
In Europe certain brands of testosterone enanthate do contain arachis oil which is a type of peanut-based oil so it’s important to inform your doctor of any allergies should you be prescribed testosterone injections.
The oily solution that is testosterone enanthate should be injected immediately after suction into the syringe as recommended by Norma who are one the manufacturers of testosterone enanthate. This means ensuring that you do not store any remaining contents of the ampoule in another syringe or in a separate vial.
One injection of 250mg of testosterone enanthate should last from 2-4 weeks depending on the original hormone levels. In modern TRT practice, this infrequent injection technique seems outdated and normally would be offered as a weekly injection of either half the amount 125 weekly or somewhere short of the full ampoule for dosing every 7-10 days.
For those that micro-dose, as in an injection more frequently than once per week, then smaller injections from 30mg to 60 mg twice per week are possible when a multi-dose preparation is available.
