@oatmiilkman's testosterone therapy claims, fact-checked

What did @oatmiilkman actually say?

Zig documented their voice at 12 checkpoints over one year of testosterone therapy, starting with "zero days on T" and ending with "one whole year on testosterone." That is essentially the entire claim. There is no dosage mentioned, no medical advice given, no promises made about outcomes. The video is a longitudinal personal record, not a health tutorial. The caption adds context: Zig describes access to trans healthcare as having "saved my life over and over again," which is an emotional claim about wellbeing, not a clinical one. It is worth separating those two things clearly. The voice documentation is observable and specific. The broader life-saving claim is personal testimony and cannot be fact-checked the way a clinical assertion can.

What makes this video different from a lot of health content is what Zig does not say. There are no promises about timelines, no claims that everyone will experience the same changes, and no medical recommendations. That restraint matters.

Does the science back this up?

Yes, substantially. Voice deepening is one of the most well-documented and largely irreversible effects of testosterone therapy in transmasculine individuals, and the timeline Zig shows is consistent with published data. Changes typically begin within weeks and continue for one to two years. The progression Zig documents, with noticeable shifts audible between months one and four and continued deepening through month twelve, tracks closely with what researchers have measured.

Ziegler et al. (2018, Journal of Voice) found that fundamental frequency in transmasculine people drops significantly within the first three to six months of testosterone therapy, with continued lowering through twelve months. Damrose (2009, Journal of Voice) documented that vocal fold changes are largely permanent after sufficient androgen exposure. A more recent systematic review by Rider et al. (2018, Pediatrics) confirmed that voice changes are among the most consistent and early-onset masculinizing effects of testosterone, alongside increased body and facial hair. None of this is disputed in the literature. Zig's video is an unusually clean real-world illustration of a well-studied physiological process.

What did they get wrong (or right)?

They got the core documentation right. The voice changes are real, the timeline is plausible, and nothing in the transcript is medically inaccurate because Zig never made a medical claim to begin with. Credit where it is due: personal documentation without overpromising is a responsible format.

The only place to flag uncertainty is the caption claim that access to trans healthcare "saved my life over and over again." That is not wrong, exactly. Research does support a strong link between gender-affirming care and reduced suicidality and improved mental health outcomes. Tordoff et al. (2022, JAMA Network Open) found that gender-affirming hormone therapy was associated with 60 percent lower odds of moderate or severe depression and 73 percent lower odds of suicidality in adolescents over twelve months. So the sentiment has empirical backing. But "saved my life" is personal testimony, not a universal outcome, and presenting it alongside the video could imply that testosterone therapy produces these results for everyone. It does not always. Individual outcomes in mental health vary considerably.

What should you actually know?

Voice changes on testosterone are real, well-studied, and begin relatively early in treatment, often within the first month. They are also not fully predictable. Starting pitch, age at initiation, genetics, and dosing all influence how quickly and how much the voice changes. Some people experience significant lowering within weeks. Others see slower progression. The changes are generally considered permanent after prolonged exposure, which means this is a decision worth making with a qualified provider, not based on a TikTok timeline alone.

There are also effects beyond voice that matter clinically. Testosterone therapy affects hematocrit, lipid profiles, cardiovascular risk, and fertility, among other things. None of that appears in this video because Zig was not making a medical case. But anyone watching and considering testosterone therapy should know that regular monitoring is standard of care, not optional. The Endocrine Society guidelines (Hembree et al., 2017, Journal of Clinical Endocrinology and Metabolism) outline recommended baseline labs and follow-up intervals. A reputable telehealth provider will follow these.

• Voice lowering typically begins within weeks and continues for up to two years.
• Changes are largely irreversible after sustained androgen exposure.
• Mental health benefits are documented but variable and not guaranteed.
• Regular blood work is a clinical requirement, not a suggestion.