@sebas.heruz's testosterone injection guide, fact-checked

What does this video actually claim?

Sebastian Heruz demonstrates testosterone injection technique on TikTok, focusing on intramuscular injection in the thigh muscle. He recommends using two imaginary V-shapes from the hip bone and knee to locate the vastus lateralis injection site.

The video shows basic injection prep including bubble removal and area cleaning. Heruz suggests the thigh offers better visibility than other injection sites, making it easier for self-administration. He starts explaining skin preparation techniques but the caption cuts off mid-sentence.

Does his injection site guidance hold up?

Heruz gets the vastus lateralis location mostly right. The "V" method he describes approximates the standard anatomical landmark technique taught in clinical settings. However, his description lacks precision.

Clinical guidelines specify the vastus lateralis as the middle third of the muscle, roughly 4-6 inches above the knee and 4-6 inches below the hip. The Endocrine Society's 2018 testosterone therapy guidelines (Bhasin et al.) recommend this site for self-injection because it's accessible and has low nerve density.

His preference for thigh over gluteal injections makes sense for solo administration. You can't see your own upper outer quadrant of the buttock, which is the standard alternative site.

What about his injection preparation?

Bubble removal is standard practice, and Heruz mentions this correctly. Air bubbles can cause injection discomfort and reduce dose accuracy, though small bubbles aren't dangerous with intramuscular injections.

The area cleaning he references is essential. Skin antisepsis with alcohol reduces bacterial contamination risk. Studies show even brief alcohol contact (15-30 seconds) significantly reduces skin flora.

However, the video doesn't address needle gauge selection. Most testosterone cypionate and enanthate formulations require 22-25 gauge needles due to oil viscosity, according to standard pharmacy references.

What did he leave out?

Heruz's technique overview misses several key safety points. He doesn't mention aspiration, though current evidence suggests it's unnecessary for vastus lateralis injections according to recent WHO guidelines.

More concerning: no discussion of injection rotation. Repeated injections in the same spot can cause lipodystrophy and scar tissue formation. Standard practice alternates between left and right thigh, and sometimes includes deltoid rotation for experienced users.

The video also skips injection angle. Intramuscular testosterone requires 90-degree needle insertion for most patients, though this varies with body fat percentage and needle length.

What should you actually know?

Testosterone injection technique matters for absorption and safety. Subcutaneous testosterone is gaining acceptance, but most prescribed formulations still require intramuscular delivery for proper pharmacokinetics.

Peak testosterone levels occur 2-3 days post-injection with cypionate, returning to baseline by day 7-10. This creates the "roller coaster" effect many patients experience with weekly dosing.

Don't learn injection technique from social media alone. Most endocrinologists or their nursing staff provide hands-on training for new patients. Some prescribing physicians offer instructional videos through secure patient portals, which beats TikTok for medical accuracy.