Low-dose testosterone in non-binary athletes: what the evidence says

What's this video probably claiming?

Based on the caption and hashtags, this creator is documenting a year of low-dose testosterone use as a non-binary person who trains for both strength and endurance. The likely claims include: 10kg of body mass gained (split between muscle and fat), improved strength and cardiovascular performance, and visible physical changes concentrated in the upper body. The framing as a "hybrid athlete" suggests this person is balancing resistance training with aerobic work, which is genuinely relevant because testosterone affects those two systems differently. The video probably positions low-dose testosterone as compatible with, or even enhancing for, endurance sports, not just lifting. That's a more nuanced claim than the typical "TRT made me strong" content, and it deserves a more nuanced look. The creator appears to be sharing lived experience rather than prescribing a protocol, which is the right framing. Whether the claims hold up to what controlled studies actually show is another question.

What does the science actually show?

Testosterone's effects on muscle mass and strength are real and dose-dependent. A landmark study by Bhasin et al. (1996, NEJM) showed that even supraphysiologic doses produced lean mass gains of roughly 6kg over 10 weeks in healthy men without training. At lower, replacement-range doses, the effects are more modest. A 2022 review by Roberts et al. in the Journal of Clinical Endocrinology and Metabolism found that transgender men on testosterone therapy gained significant lean mass within 12 months, but fat distribution changes were slower and less complete. The 10kg total mass gain described here over 12 months is plausible, though the muscle-to-fat ratio depends heavily on training, diet, and baseline hormone levels. On the endurance side, testosterone increases red blood cell production and VO2max, but data from Hilton and Roberts (2021, British Journal of Sports Medicine) show these adaptations are not fully reversed even after months of testosterone suppression, complicating the picture for athletic contexts.

Where does the social media noise diverge from clinical reality?

The biggest gap between creator content and clinical evidence here is around the idea that "low-dose" testosterone is a clean, predictable category. It isn't. Doses described as low vary wildly across content creators, ranging from 25mg weekly to well above replacement thresholds, and the physiological effects depend heavily on baseline endogenous levels, injection frequency, ester used, and individual aromatization rates. What counts as low-dose for someone with naturally higher baseline testosterone is not the same as for someone with clinically confirmed hypogonadism. A second divergence involves the hybrid athlete framing. Some content implies testosterone uniformly boosts both strength and cardio simultaneously. But testosterone-driven erythropoiesis, which raises red blood cell count, is also what gives testosterone use in endurance sports its most significant performance edge. That distinction rarely gets discussed honestly in these videos. The creator's experience is real. Generalizing it as a template for others is where problems start.

What should you actually know?

If you are considering testosterone therapy for gender affirmation or hormone optimization, the clinical pathway matters. Legitimate low-dose protocols for non-binary individuals are an active area of endocrinology research, with studies like Cocchetti et al. (2021, Journal of Clinical Medicine) examining "gender-affirming hormone therapy with low doses" and documenting partial virilization as the intended outcome. This is a medically recognized approach, not a fringe one. However, the effects on athletic performance, body composition, and long-term cardiovascular health are not as well-characterized in this population as TRT for hypogonadism in cisgender men. Monitoring hematocrit, lipid panels, liver enzymes, and endogenous hormone suppression is standard of care, not optional. Anyone watching this video and thinking about replicating a protocol based on a TikTok creator's self-reported dose and experience is skipping several steps that exist for real safety reasons. A video can document experience. It cannot replace a clinical evaluation.