Testosterone prescribing is climbing again, and men between 35 and 54 account for a large share of the growth[2,3,4]. The follow-up visits track total testosterone and hematocrit with real discipline. The face gets a quick glance. A January 2026 review from UC Irvine urologists says the skin side effects of testosterone therapy are underreported and belong in the same follow-up as the labs. This piece covers what testosterone does to facial skin, and which daily habits actually move your levels.
Testosterone therapy can increase facial oil and acne because skin converts testosterone into DHT inside the oil gland. Across TRT studies, acne affected 0.6% to 9.1% of men. New, persistent facial redness after starting testosterone can reflect a rising hematocrit and belongs with your prescriber.
Inside facial skin, the enzyme 5-alpha reductase type 1 converts testosterone into DHT, and the enzyme aromatase converts part of it into estradiol.[5,13]
Androgen receptors in the sebaceous (oil) glands of the face and scalp, where type 1 enzyme activity is concentrated, plus estrogen-responsive collagen cells in the dermis.[5,12]
Oil output and breakouts follow local DHT, and collagen signaling depends on estradiol and sun exposure history.[5,12] On therapy, facial redness can signal a rising red blood cell count.[10]
Educational Disclaimer. This article is for informational purposes only and does not constitute medical advice. Decisions about testosterone therapy, estrogen management, prescription acne treatment, diet and training belong with a licensed physician who knows your history and your labs.
Executive summary
- Your face makes its own DHT. The type 1 enzyme that converts testosterone into DHT is concentrated in oil glands, with roughly five to six times more activity in glands from the face and scalp than in glands from low-acne areas[5].
- Men stay oily for decades. Sebum output in men holds essentially steady until about age 80, while total testosterone declines about 1.6% a year from midlife[6,7].
- TRT acne is real and variable. Acne affected 0.6% to 9.1% of men across testosterone therapy studies, with the lowest rates on oral formulations[1].
- Facial redness can be a blood reading. Erythrocytosis is the most common side effect of testosterone therapy, and a ruddy complexion is one of its visible signs[9,10].
- Body fat and sleep both make a difference. Weight loss raised testosterone and lowered estradiol, and one week of five-hour night sleep cut daytime testosterone 10% to 15% in young men[15,25].
- The squat rack myth needs revision. In older men, resistance training did not significantly change resting testosterone, while interval and endurance training produced small increases[27].
- Soy is off the hook. Across 41 clinical studies and 1,753 men, soy protein and isoflavones had no effect on testosterone or estradiol[20].
How testosterone reaches your face
Let's start with the plumbing. Testosterone circulates in your blood and inside the skin, an enzyme called 5-alpha reductase converts some of it into dihydrotestosterone, or DHT, the more potent androgen at the oil gland. A second enzyme, aromatase, converts some of it into estradiol[13].
In a study of human skin, the type 1 form of 5-alpha reductase was the dominant form, and its activity sat mostly inside oil glands[5]. Glands from the face and scalp showed roughly five to six times the activity of glands from low-acne areas[5]. A man can carry a perfectly normal blood testosterone and still have a forehead with some sheen.
It also explains why the hair-loss pill in your cabinet does little for the shine. Finasteride works mainly on the type 2 enzyme found in the prostate and hair follicle. In that same skin study, finasteride was a poor inhibitor of the type 1 enzyme concentrated in facial oil glands[5].
Oil holds steady while testosterone declines
Classic data from Boston University dermatologists found that sebum output in men stays essentially unchanged from young adulthood until about age 80[6]. Testosterone declines steadily across those same years. In the Massachusetts Male Aging Study, which enrolled 1,709 men aged 40 to 70, total testosterone fell about 1.6% a year within individual men, and the bioavailable fraction fell 2% to 3% a year[7].
So the average man over 40 deals with oil and collagen loss at the same time, for decades. A routine built for only one of those problems leaves the other one untouched.
Sebum in men holds steady until about 80. Total testosterone drops about 1.6% a year from 40 on.
GOA Magazine · Hormone BiologyEstradiol belongs in male skin biology
Estradiol has a reputation problem in men's health circles, and the skin data gives it better press. In a University of Michigan study, topical estradiol increased collagen production in sun-protected hip skin of women and, to a lesser extent, of men with an average age of 75[12].
The same study found no collagen response in sun-damaged forearm or facial skin after two weeks of estradiol[12]. Years of UV exposure had blunted the signal. For your face, that means hormone levels only reach so far, and daily skin care plus sun protection carry the collagen work.
What actually moves your testosterone
Testosterone boosters line every supplement aisle. Here is what controlled research has measured, lever by lever.
Body fat is a major lever
A meta-analysis in the European Journal of Endocrinology found that both low-calorie diets and bariatric surgery raised total testosterone, with surgery producing the larger jump: about 8.7 nmol/L, against 2.9 nmol/L for dieting[15]. Weight loss also lowered estradiol[15]. Part of the mechanism is insulin. Moderate obesity lowers total testosterone through insulin-resistance-driven drops in sex hormone binding globulin, the protein that carries testosterone in the blood[16].
Fat and protein on your plate
Men chasing lean macros should read this twice. A meta-analysis of six controlled studies in 206 men found that low-fat diets significantly lowered total testosterone, free testosterone and DHT[17]. The effect was stronger in the subgroup of European and American men[17]. The paper received a formal correction in 2026, so trust the direction and treat any single percentage quoted online with caution[18].
Protein has a ceiling as well. A review of intervention studies found that very high intakes, above 3.4 grams per kilogram of body weight per day, decreased testosterone, while intakes between 1.25 and 3.4 g/kg showed no consistent effect[19]. For a 200-pound man, that threshold sits around 300 grams of protein a day. That is a lot of chicken.
Soy gets cleared
The soy panic deserves a quiet retirement. A 2021 meta-analysis of 41 clinical studies covering 1,753 men found that soy protein and isoflavones did not change total testosterone, free testosterone or estradiol, regardless of dose or study length[20]. One author directs the Soy Nutrition Institute, and the result confirms an earlier 2010 meta-analysis[20].
Alcohol: dose matters
A 2023 review found that a low-to-moderate amount of alcohol raises testosterone briefly, and a large volume lowers it[21]. The review traced the damage to stress-hormone activation plus inflammatory and oxidative stress along the hormone axis[21]. A weekend bender shows up in the bloodwork.
Sleep is a hormone input
In a University of Chicago study published in JAMA, ten healthy young men restricted to about five hours a night for one week saw daytime testosterone fall 10% to 15%[25]. The researchers noted that at least 15% of the US working population sleeps that little[25].
Low sleep duration and poor sleep quality are increasingly recognized as endocrine disruptors.[26]
Eve Van Cauter, PhD · University of ChicagoTraining: the gym lore takes a hit
A meta-analysis of older men found that resistance training did not significantly change resting testosterone, while interval and endurance training produced small, significant increases[27]. Lift anyway. The authors point out that training improved physiology in many of the included studies even when testosterone stayed flat[27].
Endurance has an upper limit. Men who log years of heavy endurance training can develop persistently low resting testosterone, typically 50% to 75% of age-matched sedentary men[28,29]. The condition appears uncommon and tied to years of high volume[28].
| Claim | What the research shows |
|---|---|
| Losing body fat raises testosterone | Supported. Diet and surgery both raised it, and estradiol fell |
| Short sleep lowers testosterone | Supported. One week at five hours cut daytime levels 10% to 15% |
| Heavy drinking lowers testosterone | Supported. Low-to-moderate amounts raise it briefly |
| Very high protein lowers testosterone | Seen above 3.4 g/kg/day. Typical high-protein intakes showed no consistent drop |
| Licorice candy lowers testosterone | Glycyrrhizin-containing licorice did in small studies. Many US licorice candies contain anise oil and zero licorice |
| Sugar causes acne | Mixed. One trial supports a link, a 2025 meta-analysis found no pooled association |
| Cutting dietary fat has no hormonal cost | Unsupported. Low-fat diets lowered total T, free T and DHT |
| Lifting raises resting testosterone | Unsupported in older men. No significant change |
| Soy lowers testosterone | Unsupported. No effect across 41 studies |
Why normal labs and an oily face can coexist
Your lab report measures testosterone in the blood. The oil gland responds to DHT made on site by the type 1 enzyme, which shows roughly five to six times higher activity in facial and scalp glands[5]. Two men with identical labs can have very different skin.
Sebum output in men stays essentially unchanged until about age 80[6]. Oil management remains a daily job for most of adult life, well past the years most men associate with breakouts.
Across testosterone therapy studies, acne affected 0.6% to 9.1% of men, with the lowest incidence on oral formulations[1]. Board-certified dermatologist Elizabeth Damstetter, MD, FAAD, notes that "taking testosterone isn't a guarantee that you'll see acne"[8].
The UC Irvine review concluded that acne and other skin reactions vary by delivery method and by the individual patient[1]. A history of oily or acne-prone skin is useful information to bring to the first appointment.
The same review found that the skin side effects of testosterone therapy are underreported compared with cardiovascular and cancer risks[1]. The authors wrote that these effects can significantly affect patient satisfaction and adherence to therapy[1].
The measurement gap
Testosterone follow-up is built around blood numbers. Hematocrit gets watched closely, and guidance calls for reducing or pausing therapy when it passes 54% until it normalizes[9]. Skin gets far less structure. The UC Irvine review found most studies lacked standardized reporting of skin effects, and it recommended skin assessment alongside hormonal monitoring at regular follow-up[1].
| Measure | Status in typical follow-up |
|---|---|
| Total testosterone | Measured routinely |
| Hematocrit | Measured routinely, with a defined action threshold |
| Facial redness | No standardized logging described |
| Acne severity and location | Seldom reported in a standardized way |
| Facial oil output | No routine measurement |
| Baseline skin photo before therapy | Absent from the reporting the review found |
What the research flags
Erythrocytosis, a high red blood cell percentage, is the most common side effect of testosterone therapy[9]. Medscape lists a ruddy complexion among its signs[10], and hematocrit rises can appear after one month, with the largest increase in the first year[11]. New, persistent facial redness goes to the prescriber with a request for a hematocrit check. Skin care does not address this.
Men make estradiol from testosterone through aromatase, and estradiol supports collagen production in sun-protected skin in older men[12,13]. Human data on estrogen blockers and male facial skin is thin. Any decision to lower estradiol belongs with the physician managing your therapy.
Men given licorice supplying 0.5 grams of glycyrrhizic acid a day saw serum testosterone fall about 26% after one week[22,23]. An independent study that measured saliva found only a small, non-significant drop[37]. The FDA warns that adults over 40 eating two ounces of real black licorice a day for two weeks risk heart rhythm problems, and notes that many US licorice-flavored products contain anise oil and no licorice at all[24]. Read the label on licorice root supplements and imported candy.
A review by dermatologists Evgenia Makrantonaki and Christos Zouboulis concluded that further extensive studies are required before hormone substitution can be recommended for aging men[14]. The same review noted that growth hormone and IGF-1 also decline with age and may account for effects often credited to testosterone[14]. Testosterone therapy treats diagnosed deficiency, and the skin rejuvenation claims some clinics attach to it exceed the evidence.
What controls oil at the skin level
Hormone levels belong with your physician. Oil control and collagen support happen at the sink every day, and several ingredients have measured data behind them.
Niacinamide has controlled trial data for oil. In placebo-controlled work led by Wake Forest dermatologist Zoe Draelos, a 2% niacinamide moisturizer lowered the facial sebum excretion rate in 100 Japanese subjects over four weeks and lowered casual sebum levels in a six-week split-face study of 30 Caucasian subjects[30]. Two co-authors were Procter & Gamble researchers. Salicylic acid, an oil-soluble exfoliant, clears the follicle, and retinoids speed cell turnover and support collagen signaling.
For stubborn androgen-driven acne, there is a prescription that works at the skin. Clascoterone cream (Winlevi), FDA-approved in 2020, is the first topical androgen receptor inhibitor for acne, and it blocks androgen receptors in the oil gland[34,38]. In a 52-week study, facial sebum dropped from 115.9 at baseline to 61.5, an overall 47% reduction[33]. The research was supported by the manufacturer, Sun Pharma, and the patients in the published analysis averaged about 21 years old[32]. Draelos describes sebum as the "final common pathway" in acne[35]. Ask a dermatologist whether it fits your situation.
Diet belongs in the conversation with honest limits. A randomized trial in young men found a low glycemic-load diet reduced weight and the free androgen index, and the authors could not rule out weight loss as the driver[31]. A 2025 meta-analysis found no significant pooled association between glycemic load, dairy or fatty acids and acne[36]. Lower-glycemic eating is low-risk to try and easy to log.
GOA's formulas address oily, aging skin in men through formulation. The Purifying Face Cleanser uses glucoside and amino acid surfactants to clear oil while leaving the barrier intact. The Collagen + Control Facial Serum pairs salicylic acid and niacinamide with microencapsulated retinol for controlled release. The Regenerative Face Cream maintains the barrier with a peptide complex, and the Exomask delivers 630 nm red and 850 nm near-infrared light for collagen signaling.
Protocol
Take a photo of your face in the same light, at the same angle, before any hormone change or at your next blood draw. Note midday oil, breakouts by zone and any redness. This is your reference point.
Repeat the photo and the notes each time labs are drawn. Add average nightly sleep, drinks per week, weight and waist measurement. Over a year, skin changes line up against hormone and hematocrit numbers, which is exactly what the UC Irvine review recommends clinicians assess[1].
Cleanse morning and evening with a gentle surfactant system. Use a leave-on with niacinamide and salicylic acid, then a retinoid and a barrier cream at night. Protect your face from the sun, because sun-damaged facial skin showed no collagen response to estradiol in the Michigan study[12].
Protect sleep, since one week of five-hour nights lowered testosterone 10% to 15%[25]. Eat enough dietary fat, stay under 3.4 g/kg of protein per day, and drink moderately[17,19,21]. Losing excess body fat raised testosterone in both diet and surgery trials[15].
Persistent facial redness goes to the prescriber with a hematocrit check[9,10]. Deep, painful or persistent acne goes to a dermatologist, who can discuss prescription options such as clascoterone[34].
Keep Reading
FAQs
Does TRT cause acne and oily skin?
It can. Testosterone converts to DHT inside facial oil glands, and DHT drives oil output[5]. Across testosterone therapy studies, acne affected 0.6% to 9.1% of men, and rates varied by delivery method, with the lowest on oral formulations[1].
Why is my face red since starting testosterone?
Testosterone therapy commonly raises red blood cell production, and a ruddy complexion is one visible sign of a high hematocrit[9,10]. Measurable increases can appear by the one-month mark[11]. Tell your prescriber and ask for a hematocrit check.
Does lifting weights raise testosterone?
In older men, a meta-analysis found resistance training did not significantly change resting testosterone, while interval and endurance training produced small increases[27]. Lifting still builds muscle and improves insulin sensitivity. Years of very heavy endurance volume can lower resting testosterone[28].
What foods lower testosterone?
Low-fat diets lowered total testosterone, free testosterone and DHT in controlled studies[17]. Protein intakes above 3.4 g/kg per day lowered testosterone[19], and glycyrrhizin-containing licorice lowered it in small trials[22,23]. Soy had no effect across 41 studies[20], and heavy drinking lowers testosterone while light drinking raises it briefly[21].
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