One year on testosterone: what FTM timelines actually show

What did @ace_of_spades_13 actually say?

Mostly, this video is a joke. Ace uses self-deprecating humor to mark one year on testosterone, attributing voice changes to things like "injecting monster energy" and "becoming my Mormon family's worst nightmare" rather than making direct medical claims. The actual factual content is minimal: Ace demonstrates a voice before starting testosterone and a noticeably deeper voice at the one-year mark. The phrase "Man Juice" is slang for testosterone. There are no dosage claims, no brand comparisons, and no promises about what testosterone will do for anyone else. This is a personal milestone video dressed up as comedy, not a medical tutorial. That matters for how we evaluate it.

The only real implicit claim here is that testosterone caused a significant voice change over one year. That claim, stripped of the Monster Energy jokes, is actually well-supported by research.

Does the science back this up?

Yes, the voice deepening is real and well-documented. Gender-affirming testosterone therapy in transmasculine individuals reliably produces voice lowering, and a year is a reasonable timeline to hear significant change.

Research backs this up clearly. Ziegler et al. (2018, Journal of Voice) found that fundamental frequency in transmasculine individuals decreased significantly within the first year of testosterone therapy, with most change occurring in the first three to six months. A separate study by Azul et al. (2017, International Journal of Language and Communication Disorders) noted that while testosterone produces voice lowering comparable to cisgender male puberty, individual variation is substantial. Some people hear dramatic change early; others wait longer. Van Borsel et al. (2008, Journal of Voice) confirmed that intramuscular testosterone consistently lowers speaking fundamental frequency in female-to-male transgender individuals. So the before-and-after voice difference Ace is demonstrating is not anecdote. It reflects a well-replicated physiological effect of androgens on the larynx.

What did they get wrong (or right)?

Ace got the core thing right: testosterone changes the voice, and a year is enough time to hear it. The humor framing means there is nothing technically wrong to debunk here. No false dosage claims, no miracle promises.

That said, a few things worth flagging for anyone watching this and forming expectations. First, Ace's experience is one data point. The Azul et al. (2017) review is explicit that voice outcomes vary considerably between individuals. Some transmasculine people do not achieve the degree of voice change they hoped for even after a year. Second, voice change on testosterone is largely permanent. That is generally framed as a positive in this community and for many it is, but it is a clinically relevant irreversibility that viewers should understand before starting therapy. Third, the video implies a clean, linear progression month by month. In practice, testosterone's effects are not always that tidy. Hembree et al. (2017, Journal of Clinical Endocrinology and Metabolism) notes that voice changes, like other virilizing effects, depend on dose, individual androgen sensitivity, and baseline hormone levels.

What should you actually know?

If you are considering testosterone therapy, this video is a reasonable slice of lived experience, not a clinical guide. Here is what the research actually tells us.

• Voice lowering is one of the most consistent and earliest physical effects of testosterone in transmasculine individuals, typically beginning within weeks to months of starting therapy.
• It is also one of the few effects that does not reverse if therapy is stopped, according to Hembree et al. (2017, JCEM), the Endocrine Society's clinical practice guidelines.
• Individual results vary. Genetics, baseline testosterone levels, and dosing all influence how much change occurs and how fast.
• Voice changes may continue beyond one year. Some research suggests ongoing changes up to two years into therapy.
• Gender-affirming hormone therapy in adults is considered safe and effective by major medical organizations including WPATH (World Professional Association for Transgender Health), the Endocrine Society, and the American Academy of Pediatrics, though it requires medical supervision and monitoring.

Ace's video is a celebration, not a prescription. Take it as the former and talk to a licensed provider about the latter.