@breannekallonen's testosterone advice for women, fact-checked

What did @breannekallonen actually say?

The creator, who appears to be a clinician, says she sees hair loss regularly in her practice tied to high androgen levels. Her core claim: "overdoing testosterone replacement therapy absolutely has side effects such as hair loss" in women. She singles out injections and pellets as the delivery methods most likely to push levels too high, and argues that "super physiological dosaging" is the problem, not testosterone itself.

She is careful to frame testosterone as genuinely useful for women, saying she thinks it is "wonderful" when used at the correct dose. This is a clinically responsible framing, even if the video is short on specifics about what "correct" actually means in practice.

Does the science back this up?

Mostly, yes. The androgen-hair loss connection in women is real and reasonably well-established, though the mechanism is more complicated than the video implies.

Androgen-induced hair loss in women typically involves dihydrotestosterone (DHT), which is converted from testosterone by the enzyme 5-alpha reductase in hair follicles. Follicles sensitive to DHT undergo miniaturization, producing progressively thinner strands. Glaser and Dimitrakakis (2013, Maturitas) documented supraphysiological testosterone levels in women using pellets and noted androgenic side effects including hair changes. A 2019 review by Islam et al. in the Journal of the American Academy of Dermatology confirmed that exogenous androgen exposure is a recognized cause of female pattern hair loss and hyperandrogenism-related alopecia.

The creator also mentions DHEA alongside testosterone. That is accurate. DHEA converts peripherally to both testosterone and estrogen, and elevated DHEA-S is associated with androgenic alopecia in women (Carmina et al., 2006, Fertility and Sterility).

Where the video is thin: it does not explain that individual sensitivity to androgens varies enormously. Some women lose hair at testosterone levels that are technically within range. Serum levels alone do not tell the whole story.

What did they get wrong (or right)?

She got the headline right. High-dose exogenous testosterone can cause hair loss in women, and pellets and injections are genuinely harder to titrate than gels or patches. That part is accurate.

What she glosses over is that hair loss from androgens in women is not purely a dose problem. It is also a sensitivity problem. Women with higher 5-alpha reductase activity or more androgen-sensitive follicles can experience alopecia even at normal testosterone levels. A clinician treating women for hair loss under HRT needs to think about both the dose and the individual's receptor sensitivity, not just whether the number on the lab report looks physiological.

She also mentions "DHE," which appears to be a shorthand for DHEA. The transcript is ambiguous here. If she meant DHT, that would be more precisely correct in the context of hair follicle physiology. If she meant DHEA, the point still holds but the mechanism is one step removed. This is a minor slip in language, not a factual error, but precision matters in clinical communication.

She is right to be skeptical of pellets for this specific concern. Pellet dosing is difficult to reverse if levels go too high, and the literature supports her caution (Glaser et al., 2013, Maturitas).

What should you actually know?

If you are a woman on testosterone therapy and noticing hair thinning, a few things are worth understanding before you panic or quit your prescription.

• Hair shedding can lag behind a hormone change by two to four months, so timing matters when you try to connect cause and effect.
• Not all hair loss on HRT is androgen-driven. Thyroid dysfunction, iron deficiency, and telogen effluvium from stress are common confounders that get missed when the assumption is always "too much testosterone."
• DHT, not testosterone directly, is typically the proximate cause of follicle miniaturization. Some clinicians check DHT levels specifically rather than relying on total testosterone alone.
• Delivery method matters. Gels and patches allow for finer dose adjustments and can be stopped quickly. Pellets cannot be removed easily and can leave levels elevated for months.
• "Staying within normal ranges" is a reasonable starting principle, but female testosterone reference ranges are broad and poorly standardized across labs. A result in range does not automatically mean it is the right level for that individual.

If hair loss is a concern, the conversation with your prescriber should include a full androgen panel (total testosterone, free testosterone, DHEA-S, DHT), a thyroid panel, ferritin, and a scalp assessment, not just a single testosterone number.