@hydromedspa's subcutaneous TRT claims, fact-checked

What did @hydromedspa actually say?

Dr. Travis Jeffers, presenting as a clinician at a med spa, walked through subcutaneous testosterone injection technique in about a minute. His core points: the abdomen is the go-to site for most guys, volume matters when choosing a location, and a 30-gauge half-inch needle going straight in is his preferred approach. He added that longer needles may require a 45-degree angle to avoid going intramuscular.

He also mentioned alternatives including "the flanks," "hips area," and "back of the arm" as viable sites, and advised staying away from the belly button. Nothing here was reckless. This reads like practical clinical guidance, not hype. But there are a few things worth examining more carefully before you take this as settled protocol.

Does the science back this up?

Mostly, yes. Subcutaneous testosterone administration is well-documented and increasingly used in clinical practice. A 2012 study by Olsson et al. in the Journal of Sexual Medicine confirmed that subcutaneous testosterone cypionate produced stable serum levels with good tolerability. A later analysis by Spratt et al. (2017, Journal of Clinical Endocrinology and Metabolism) found subcutaneous delivery produced less peak-to-trough variability than intramuscular in some patients.

The abdominal region is the most commonly recommended site in clinical literature, largely because most patients have accessible subcutaneous fat there and it allows for consistent self-injection. The volume guidance he gives is also supported by practice. Subcutaneous injections are generally limited to 1 mL or less per site to minimize discomfort and absorption issues, which aligns with what he said about smaller volumes giving you more flexibility on site selection.

What did they get wrong (or right)?

His needle guidance is mostly right, but slightly oversimplified. A 30-gauge half-inch needle going straight in works well for patients with adequate subcutaneous fat depth, but it is not universally appropriate. Lean patients with minimal abdominal fat can inadvertently hit muscle with a straight-in technique using even a half-inch needle, depending on body composition. He does not mention this caveat.

His claim that a longer needle "going straight in" would require a 45-degree angle to "stay in the subcutaneous tissues" is accurate in direction but the explanation is a bit muddled. The 45-degree angle reduces effective needle depth, which is the actual reason it is used, not just to stay out of muscle but to control depth relative to fat thickness. That is a minor technical imprecision, not a dangerous error.

He also uses the phrase "simultaneous" when he clearly meant "subcutaneous." That is likely a verbal slip, but worth noting since this video reaches tens of thousands of people learning injection technique.

What should you actually know?

Subcutaneous TRT is a legitimate and increasingly preferred route for many patients. It is not fringe or experimental. If you are on a supervised TRT program, your prescribing clinician should walk you through site selection, needle size, and injection volume based on your specific body composition, not a one-size-fits-all protocol from a short video.

A few things this video does not cover that matter in practice:

• Rotating injection sites is important to reduce localized lipohypertrophy, a real risk with repeated subcutaneous injections in the same spot.
• Subcutaneous absorption rates can vary between sites. The abdomen tends to have faster absorption than the flank or posterior arm, which can affect your testosterone curve.
• Patients on higher-volume protocols, anything over 0.5 mL per injection, may need to split doses across multiple sites, not just pick a larger fat pocket.
• Skin prep, angle confirmation, and aspiration practices vary by clinical setting. Follow your provider's specific guidance.

Nothing in this video should replace a conversation with the clinician managing your TRT. It is useful general context, not a substitute for individualized instruction.