However, it’s worth mentioning that chronic exposure to extreme heat, such as in certain occupational settings, may have more pronounced effects on testosterone levels. However, there are various factors that can impact testosterone levels, including excessive exposure to heat, such as saunas. Yes, frequent and prolonged exposure to heat, such as from hot baths or saunas, can negatively impact sperm production and motility, which can affect fertility. However, it’s important to note that most studies show a temporary effect, and testosterone levels generally recover after the heat exposure ceases.
While some people might experience a noticeable LH boost from cold exposure, others may see little change. Cold water immersion might stimulate LH release, potentially paving the way for higher testosterone production. Even a brief 15-minute cold plunge at 50°F (10°C) can keep cortisol levels lower for up to three hours . By reducing overall body fat, brown fat activation may help lower estrogen levels, improving the testosterone-to-estrogen ratio . Research by Susanna Soberg highlights how cold exposure can transform white fat - typically metabolically inactive - into energy-burning brown fat . This process can indirectly affect testosterone levels by improving the testosterone-to-estrogen balance. This complexity makes it difficult to predict exactly how cold plunges will affect an individual’s hormone levels.
A different study had participants wear insulated jockstraps for six to fourteen weeks. The results were intratesticular temperatures of 40–42 ˚C (104–108 ˚F) and infertility. One study exposed participants’ testes to microwave radiation for thirty minutes every three weeks. The testes are covered by the cremaster muscle, which involuntarily contracts or relaxes to either draw the testes closer to the body for warmth or away from the body to cool. A 1994 meta-analysis found that the sperm density of smokers is on average 13 percent to 17 percent lower than that of nonsmokers, although the researchers were not able to identify a dose-dependent relationship between the number of cigarettes smoked per day and sperm density. Unfortunately, studies of such size are expensive and complex and therefore rare. Did you know that the average cisgendered male human produces approximately the same number of morphologically normal sperm per day as a hamster, despite having testicles ten times the size?
Prolonged exposure to high temperatures can lead to a temporary decrease in testosterone production. The question of whether hot baths affect testosterone levels is a subject of ongoing interest. Therefore, further research is needed to confirm the effects of repeated sauna-induced thermal stress on specific hormones and the relationships between different hormones (such as the T/C ratio). An increase in COR concentrations is considered a sensitive indicator of a stress reaction and intolerance of heat, which is most frequently reported in infrequent or first-time sauna users (Follenius et al., 1982). In the present study, a significant decrease in COR levels could suggest that users who regularly use the sauna (twice a week) are accustomed to extreme changes in temperature.
At least one study has found a dose-dependent response between male body mass index (BMI) and infertility. Hopefully, future studies will examine whether the small temperature changes in testes induced by tight bottoms are capable of influencing fertility. Studies have shown that when wearing tight underwear, testicular temperatures do increase.
Men and women seem to respond differently to cold exposure, though research on female hormonal responses is still limited. Sean Smiley, a 43-year-old man, saw his testosterone levels climb from the low 200s ng/dL to 595 ng/dL within 35–45 days . Even shorter exposures may temporarily lower testosterone, with factors like age, fitness level, and acclimation to cold playing a role. More extreme scenarios, like a 9-hour dive at 39°F (4°C) among military trainees, resulted in a significant decrease in total testosterone levels . Research indicates that cold immersion can suppress testosterone if not done correctly. These include the testes’ sensitivity to LH, the body’s ability to convert precursor molecules into testosterone, and the influence of other hormones.
The world of cold therapy is vast, and while it offers many benefits, it’s crucial to remember that each individual’s journey will be unique. Starting slow, listening to one’s body, and seeking guidance when necessary are paramount. For those intrigued by the promise of cold therapy, it’s essential to approach it with both enthusiasm and caution. Most studies have been centered on young male athletes, leaving a vast expanse of uncharted territory. This gradual approach reduces the risk of shock and allows your body to adapt safely.
Several studies have investigated the effects of heat on testosterone levels. Repeated exposure to hot and cold thermal stress significantly decreases COR levels in young men who are regular sauna users, but it does not induce significant changes in the concentrations of TES, PRL, or DHEA-S. Other studies demonstrated a less significant increase in COR levels in young women on day 14 of daily sauna use, which suggests that the body becomes familiarized with a hot environment (Pilch et al., 2003, 2007).

Doug Moats, 20 years
Various epidemiological studies in men have examined associations between testosterone and estradiol levels and BMD. A recent study showed that supervised diet and exercise increased testosterone levels in hypogonadal men with metabolic syndrome and newly diagnosed type 2 diabetes. The withdrawal of testosterone therapy in hypogonadal patients that had been stabilised on this therapy leads to an increase in insulin resistance within 2 weeks and prior to significant weight gain (59). Adipose tissue affects testosterone levels by increasing the aromatisation of testosterone to estradiol, because the aromatase enzyme is concentrated in adipocytes. Low testosterone levels increase fat mass and decrease lean muscle, resulting in increased adipose tissue (52). There is an inverse relationship between serum total and free testosterone levels and visceral fat mass. Another intriguing observation is that prostate-specific antigen (PSA), a marker for prostate cancer, is significantly lower in type 2 diabetics and this is related to their lower plasma testosterone concentrations (46).
The hypothalamus secretes gonadotropin-releasing hormone (GnRH) that acts on the anterior pituitary to produce follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The different names have arisen as authors try to separate the hypogonadism resulting from natural ageing from, for example, the hypogonadism caused by testicular trauma. The purpose of this review is to summarise the current understanding of male hypogonadism, with particular reference to the needs of the primary care physician. As a result, physicians will be increasingly likely to encounter men with the symptoms of hypogonadism in the clinic. There are a number of formulations available for testosterone therapy including intramuscular injections, transdermal patches, transdermal gels, buccal patches and subcutaneous pellets.
Most hospital laboratories can provide total testosterone measurements of good accuracy and reliability. Serum total testosterone is the easiest and most straightforward measurement to take for the first measurement. In our opinion, screening for at-risk patients is therefore worthy of consideration. Screening tools can be helpful in identifying patients with a high probability of having low testosterone.
The best way to check for low testosterone is to visit a doctor for a physical exam and a blood test. When people enter menopause, their estrogen levels typically drop. In people who are premenopausal, testosterone is made mainly in the ovaries. However, more research is needed to see whether prenatal testosterone affects autism later in life. Testosterone is necessary for fetal development during pregnancy because it helps control the development of the male reproductive system.
Quantum Testosterone – the A-to-Z system for Men & Women to learn to optimize their hormones  for explosive energy, lean muscle, and timeless vitality. Join my #1 online membership group, Fully Optimized Health to receive guidance from me and an elite group of more than 800 male and female biohackers (who all started out just like you) The Kisspeptin data is proof-of-concept, and the oxytocin dosing for sexual enhancement is still being refined (both anecdotally and clinically). Kisspeptin represents an interesting alterantive, with a novel mechanism targeting sexual brain networks directly. PT-141 is the most established tool for neurological sexual desire, with FDA approval, established dosing protocols and a well-known side effect profile. The libido peptide landscape is broader than most people realize, and it overlaps significantly with the hormone optimization and fertility conversation.
There is a high prevalence of hypogonadism in the middle- and older-aged male population and various prevalence figures have been described in a number of studies. Testosterone treatment is contraindicated in subjects with prostate cancer or benign prostate hyperplasia and risks of treatment are perceived to be high by many physicians. These are efficacious in establishing eugonadal testosterone levels in the blood and relieving symptoms. Diagnosis of the condition requires the presence of low serum testosterone levels and the presence of hypogonadal symptoms.
The Massachusetts Male Aging Study (10), an observational cohort study conducted on healthy men aged 40 to 70 years from the Boston area, estimated that the prevalence of androgen deficiency (total testosterone The authors found no statistically significant difference in serum total testosterone levels across the cohorts grouped by decades of age. The physiological age-related decrease in testosterone production should be differentiated from late-onset hypogonadism (LOH), defined as the presence of three sexual symptoms and low testosterone (low T) in aging men (2). Many men with low testosterone levels have no symptoms, and many men with symptoms who receive treatment and reach goal testosterone levels have no improvement in their symptoms. Other things being equal (haematocrit, bone density, and symptoms), treatment aims to achieve testosterone levels in the reference range (mid-range for gel; low end at trough for injectables).

Verna Sons, 20 years
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