Three months on testosterone gel: what the science says about FTM HRT timelines

What did @andys_mummydust actually say?

Straightforwardly: nothing medically specific at all. Andy's video is a comedic bit, not a health tutorial. Each clip is introduced with a nonsense "reason" for their voice change, things like "chewing rusted forks" and "huffing gasoline at every chance I get." The actual medical content, testosterone gel, 96 days of use, voice masculinization, lives entirely in the caption.

That's worth noting because the video is categorized under TRT and tagged with ftm and hrt. The real claim being made isn't verbal. It's implicit: here is what my voice sounds like at roughly 3-month intervals on testosterone gel. The humor is a vehicle for something real. Andy's voice audibly deepens across the seven clips, from a higher, softer register on day one to a noticeably lower, rougher tone by day 96. That progression is the actual content being communicated, and it's consistent with what the clinical literature describes.

Does the science back this up?

Yes, with some important nuance. Voice deepening is one of the earliest and most consistently documented effects of testosterone therapy in transmasculine individuals. The timeline shown, changes beginning within weeks and continuing through the first few months, matches the research reasonably well.

A 2016 study by Ziegler, Henke, Wiedner, and colleagues published in the Journal of Voice found that fundamental frequency (the acoustic measure of pitch) began declining within the first month of testosterone treatment and continued dropping for up to 12 months. T'Sjoen, Van Caenegem, and Wierckx (2019) in Nature Reviews Endocrinology noted that laryngeal changes are largely irreversible once they occur, which is clinically significant. The voice changes seen in Andy's video are not magic or absurdist, they reflect real androgenic effects on the vocal cords, specifically thickening of the vocal fold mucosa and increased mass of the thyroarytenoid muscle. These changes produce a lower fundamental frequency and often a rougher, breathier quality during transition, which is also audible in the clips.

What did they get wrong (or right)?

Andy didn't get anything wrong medically, because Andy didn't make any medical claims. The video is a joke framing device, and it works precisely because the voice change speaks for itself. Credit where it's due: the format is actually a clever way to document longitudinal change without making inflated promises about what T will do for everyone.

What the video does not address, and what viewers scrolling through TikTok might not think to ask, is that voice changes on testosterone are not uniform. Some individuals see significant pitch drops within weeks. Others experience slower or more modest changes, and the extent of change correlates with factors including age, genetics, and the specific formulation and dosage used. Gel delivery, the method Andy mentions in their caption, generally produces more stable serum testosterone levels than injections, but this also varies by individual absorption. A 2021 paper by Deutsch (Endocrinology and Metabolism Clinics of North America) noted that patient expectations around voice change are among the most common sources of dissatisfaction or distress in early HRT, which is a real clinical problem this kind of video can inadvertently set up if viewers treat one person's timeline as a guarantee.

What should you actually know?

If you're considering testosterone therapy for gender affirmation and voice change is part of what you're hoping for, here's what the evidence actually says. Voice deepening is a well-documented androgenic effect with a reasonable evidence base. It typically begins within the first one to three months. It is considered permanent once it occurs, unlike some other effects of testosterone that are reversible if treatment is stopped.

But individual variation is significant. A 2017 study by Damrose in the Journal of Laryngology and Otology found that the degree of vocal change does not reliably predict based on dosage alone. Some trans men pursue additional voice training alongside HRT to address resonance and speech patterns, which testosterone does not change on its own. None of this is a reason not to pursue testosterone if it's right for you. It's just a reason not to treat one person's 96-day TikTok as a clinical roadmap. Andy's experience is real and valid. It is also one data point.

• Voice deepening on testosterone typically begins within 4-8 weeks of starting therapy.
• Changes are driven by androgen-induced thickening of vocal fold tissue, not the absurdist activities described in the video.
• Gel formulations like the one Andy uses produce steadier hormone levels than injections, but absorption varies person to person.
• Vocal pitch changes from testosterone are generally considered irreversible.
• Resonance, articulation, and speech patterns may require additional voice therapy beyond what HRT alone achieves.