Testosterone injections for trans women: what HRT actually does

What did @isabelleeobrienn actually say?

She switched from intramuscular (IM) to subcutaneous (subQ) testosterone injections because "the needle isn't like a foot long and it doesn't hurt when it goes in," allowing her to self-inject for the first time. She demonstrated her injection technique, including drawing medication, flipping the vial, pulling to 0.2 on the syringe, cleaning the injection site, and injecting into the hip area. She also noted the medication "leaking out" after the injection and called these "classical injections in my hips."

She also casually skipped handwashing, spilled some medication mid-draw, and asked her boyfriend to hold her for emotional support during the injection. Real and relatable, but worth examining what the actual stakes are when technique goes sideways.

Does the science back this up?

Mostly, yes. SubQ testosterone injections are clinically validated and the preference difference she describes is well-documented in the literature. The part about leakage, though, is a genuine clinical concern that deserves more than a passing mention.

SubQ testosterone delivery produces slower absorption and more stable serum testosterone levels compared to IM injection, which tends to create sharper peaks and troughs. A 2017 study by Spratt et al. published in the Journal of the Endocrine Society found that subQ testosterone cypionate produced stable testosterone levels with smaller fluctuations than IM routes, which is why many clinicians now favor it for frequent low-dose protocols. The smaller needle gauge (typically 25-27G for subQ vs. 21-23G for IM) does meaningfully reduce injection pain, so her observation there is accurate. The abdomen, thigh, and upper hip fatty tissue are all appropriate subQ sites, though "hips" as a site description is vague enough to be worth flagging.

What did they get wrong (or right)?

She got the core pharmacology right. She got the sterile technique partially right and partially wrong, and the leakage issue is the most clinically significant thing she underplayed.

Skipping handwashing is not a minor stylistic choice. It is how injection site infections start. The CDC's injection safety guidelines are explicit: hand hygiene before any injection is non-negotiable, not a "same vibe" situation. Spilling medication during the draw is also not just an inconvenience. It creates dosing uncertainty, and with hormone therapy, consistent dosing is the entire point of the protocol.

The leakage after injection, which she described casually, can indicate the needle was withdrawn too quickly, the injection angle was off, or the volume exceeded what that subQ depot could absorb. A 2020 review by Cook et al. in the journal Transgender Health noted that injection technique errors, including post-injection leakage, are among the most common self-administration problems and can contribute to inconsistent hormone levels. She got credit for keeping the needle sterile and using the draw needle correctly, but the overall execution had real gaps.

What should you actually know?

If you are self-injecting any hormone therapy, technique is not optional. The difference between a clean, well-placed injection and a sloppy one can affect your actual hormone levels, not just your comfort.

Here is what the clinical guidance actually says. SubQ injections should be administered at a 45-degree angle into a pinched skin fold, typically in the abdomen or outer thigh, using a 25-27 gauge needle. Post-injection leakage usually means the needle was removed before the medication fully dispersed, or the volume was too large for that tissue pocket. Holding gentle pressure for 10-30 seconds after withdrawal reduces leakage. Rotating injection sites prevents lipohypertrophy, a real risk with repeated subQ injections into the same spot. And handwashing with soap and water, not a drink of water, is step one every single time.

If you are new to self-injection and your prescribing provider has not walked you through technique in detail, that is a gap in your care worth addressing directly. FormBlends providers can walk through injection technique as part of a clinical consultation.

The bottom line

This video is charming, relatable, and genuinely useful as a first-person account of what switching injection routes feels like. But it is not a tutorial you should follow for technique. The science behind subQ HRT is solid. The execution shown here had several errors, some minor and some not. If your medication is leaking out and you skipped handwashing, you are not doing it completely right, whatever the vibe.