What did @mccallmcphersonpa actually say?
The creator, identified as a PA, claims Kyzatrex (oral testosterone undecanoate) is "the most closely mimicking your natural circadian rhythm" compared to injections. They argue that weekly injections cause a spike-and-crash pattern, while daily oral dosing aligns with the body's natural morning testosterone peaks. They also state that 98% of TRT patients are on injections and that oral testosterone has been "a holy grail" in pharma for over 20 years.
The framing is enthusiastic, bordering on promotional. Words like "magic" and "game changing" appear throughout. That doesn't automatically make the claims wrong, but it does warrant a closer look at what the evidence actually supports versus what's being sold to 24,000 viewers.
Does the science back this up?
Partially, yes. The circadian rhythm argument has real biological grounding, but the clinical significance of mimicking that rhythm is less settled than the video implies.
Testosterone does follow a diurnal pattern, peaking in the morning and declining through the day. This is well-documented (Bremner et al., 1983, Journal of Clinical Endocrinology and Metabolism). Weekly testosterone cypionate or enanthate injections do produce supraphysiologic peaks followed by troughs, and this has been associated with mood variability and symptom fluctuation in some patients (Minnemann et al., 2008, European Journal of Endocrinology).
Kyzatrex received FDA approval in 2022. Its clinical trial data (the REMS-required SOAR trial) showed it could restore testosterone to normal ranges in hypogonadal men with twice-daily dosing linked to fat-containing meals. The pharmacokinetics do produce a more frequent oscillation than weekly injections. However, the trial did not include a head-to-head comparison with injections on patient outcomes like mood, energy, or libido. The "magic" the creator references lacks a controlled comparison to support it.
What did they get wrong (or right)?
They got the general pharmacokinetic contrast right. Injections do cause peaks and troughs; daily oral dosing does produce more frequent fluctuations. That part is accurate.
Where things get slippery: claiming daily dosing "effectively is the most closely mimicking your natural circadian rhythm" overstates what the evidence shows. Kyzatrex produces two concentration peaks per day tied to meals, not a single early-morning peak followed by a gradual decline. That is not the same as a natural diurnal rhythm. It is a different curve, arguably a smoother one than weekly injections, but calling it a circadian mimic is a stretch.
The 98% injection statistic is unverified. Prescribing data from IQVIA and similar sources show injections are the most common TRT form, but that specific figure is not cited in peer-reviewed literature the way it is stated here.
The adherence argument is on firmer ground. Oral medications generally show higher adherence than self-administered injections (Verma et al., 2014, Patient Preference and Adherence). That is a reasonable clinical point.
What should you actually know?
Kyzatrex is a legitimate, FDA-approved option for men with documented hypogonadism. It is not a supplement, not a compounded product, and not a workaround. It requires a prescription, monitoring, and, because of cardiovascular risks associated with testosterone therapy broadly, ongoing clinical oversight.
The drug carries a REMS program specifically because testosterone products have known cardiovascular and polycythemia risks. The video does not mention any of this. That omission matters when you are talking to tens of thousands of people who may self-identify as having "low T" without a confirmed diagnosis.
Daily oral dosing does reduce the injection burden, which is a real quality-of-life benefit. But "the most closely mimicking your natural circadian rhythm" is a marketing phrase that does not fully survive scrutiny. Patients deciding between TRT delivery methods should have that conversation with a clinician using their actual lab values, cardiovascular history, and lifestyle, not a 90-second Instagram clip.
- Kyzatrex requires fat-containing meals for adequate absorption. Missing meals affects levels meaningfully.
- Oral testosterone undecanoate bypasses hepatotoxicity concerns of older oral androgens by absorbing via lymphatics, not first-pass liver metabolism.
- No head-to-head randomized controlled trial comparing Kyzatrex to injections on symptom outcomes has been published as of mid-2024.