Examples include genital virilisation such as midline fusion, phallic urethra, scrotal thinning and rugation, and phallic enlargement; although the role of testosterone is far smaller than that of dihydrotestosterone. Effects before birth are divided into two categories, classified in relation to the stages of development. The relative potency of these effects can depend on various factors and is a topic of ongoing research. Testosterone can be described as having anabolic and androgenic (virilising) effects, though these categorical descriptions are somewhat arbitrary, as there is a great deal of mutual overlap between them. Another study involving 1,879 individuals aged 70–84 years showed that low FT levels predicted decreased handgrip strength in women and reduced physical performance in men, but not muscle mass loss after 2 years of follow-up (Shin et al., 2021). Logistic regression models were used to examine the odds ratio (OR) and 95% confidence interval (95% CI) for the association between testosterone levels and low muscle mass and strength. This comprehensive inclusion of covariates ensured a robust analysis by accounting for multiple factors that could influence the relationship between testosterone levels and muscle mass and strength. It employs standardized and validated methods to measure testosterone levels and muscle mass and strength. Lipophilic hormones (soluble in lipids but not in water), such as steroid hormones, including testosterone, are transported in water-based blood plasma through specific and non-specific proteins. The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb. The same research found fathers (outside competitive environments) had the lowest testosterone levels compared to other males. Higher testosterone levels in men reduce the risk of becoming or staying unemployed. While the extent of paternal care varies between cultures, higher investment in direct child care has been seen to be correlated with lower average testosterone levels as well as temporary fluctuations. Physical presence may be required for women who are in relationships for the testosterone–partner interaction, where same-city partnered women have lower testosterone levels than long-distance partnered women. On the other hand, elevated testosterone in men may increase their generosity, primarily to attract a potential mate. Testosterone levels play a major role in risk-taking during financial decisions. There has been speculation that these changes in testosterone result in the temporary reduction of differences in behavior between the sexes. There is a time lag effect when testosterone is administered, on genital arousal in women. This reaction engages penile reflexes (such as erection and ejaculation) that aid in sperm competition when more than one male is present in mating encounters, allowing for more production of successful sperm and a higher chance of reproduction. The two charts below list the general normal ranges of testosterone based on age and sex. If any of these organs — your hypothalamus, pituitary gland or gonads — aren’t working normally, that can cause abnormal testosterone levels. Synthetic testosterone is the main drug of masculinizing hormone therapy. Your adrenal glands also produce the hormone dehydroepiandrosterone (DHEA), which your body transforms into testosterone and estrogen. Abdominal fat and age seem to be stronger drivers on future symptoms than the individual's baseline testosterone level," concludes Amar Osmancevic. To maintain healthy levels of vitamin D, try to get regular exposure to sunlight or consider taking a vitamin D3 supplement as directed by a healthcare professional. Research often highlights the dangers of long-term stress, which can elevate levels of the hormone cortisol. Testosterone is a steroid hormone that the body mainly produces in the testicles and ovaries. You may be able to increase your levels naturally by lifting weights and getting more of certain nutrients. A health care professional will take a blood sample from a vein in your arm, using a small needle. When testosterone is bound, your body can't use it as easily. Testosterone levels may drop as quickly as 30 minutes after you drink alcohol. Getting good sleep is as important for your health as diet and exercise. More research is needed, as other studies, such as one from 2023, yield conflicting results. Vitamin D is a micronutrient that plays a key role in many aspects of health. Sudden elevations in cortisol can quickly reduce testosterone. Contact a health care provider if you have questions about your health. You may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly. This is called androgen insensitivity syndrome (AIS) and occurs when someone is genetically male but is insensitive to androgens (male sex hormones). The symptoms of low testosterone vary based on your age. In female adults, high levels of testosterone may be a sign of polycystic ovary syndrome (PCOS). High levels of testosterone in female infants may lead to enlargement of their clitoris that can look almost like a penis. Excess testosterone in male children can lead to precocious (early) puberty, which is when puberty begins before the age of nine. It’s unlikely — and difficult to tell — that a male adult has higher-than-normal levels of testosterone. TRT involves taking manufactured forms of testosterone to regulate your levels of this hormone. Men can often feel a big difference when they stop therapy because their body's testosterone production has not yet recovered. Sleep deprivation can significantly reduce testosterone levels. Chronic stress can significantly lower testosterone levels by elevating cortisol, which interferes with testosterone production. Focus on a balanced diet rich in protein, healthy fats, and micronutrients to support natural testosterone production. Healthy testosterone levels are crucial for overall well-being.