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Worn out? Irritable? Gaining weight? Low libido? Memory problems? You and your doctor might not think about low testosterone when you think about your symptoms, but you might after reading this.

Many symptoms of low testosterone are similar to those of other conditions. Before you self-diagnose with Dr. Google or get a prescription based only on how you feel, see if low testosterone might be the issue.

How Common is Low Testosterone?

Some experts believe a quarter of 30-year-old men have low testosterone.

A 2006 study found 39 percent of U.S. men, age 45 and older, were testosterone-deficient. With about 40 percent deficient, most men are below optimal levels.

The situation is slightly better for women. In his book, Unleash the Power of the Female Brain, Daniel Amen, MD, points out that 20 percent of women have low testosterone. He also suggests another 20 percent of women have polycystic ovary syndrome (PCOS), which is caused by testosterone levels that are too high.

Unfortunately, these numbers are based on people who have gone to the doctor and are experiencing symptoms. Chances are, many more men and women have testosterone levels out of balance. If you haven’t had your testosterone levels checked, you could be among them.

Why Are So Few Aware of the Low Testosterone Problem?

Most people don’t know how important testosterone is. They see it as a hormone for making muscles and boosting libido.

They don’t relate testosterone to heart disease, insulin resistance, degenerative brain disease, or depression. As you’ll see, low testosterone plays a role in these conditions and many more.

It’s for this reason we recommend adults, beginning at age 30, get a complete lab panel each year. If everyone did this, they’d likely identify trends leading to health problems, long before they became actual “health problems.”

These trends include changes in hormones like testosterone. Fortunately, you don’t have to wait for your doctor to order such a lab panel (most doctors won’t). You can order your own, like the Hormone Health panel from Life Time.

Signs and Symptoms of Low Testosterone

Healthcare practitioners diagnose men as “low” in testosterone when their levels fall below 300ng/dL. However, signs and symptoms of low testosterone often occur at levels much higher.

The “normal” range for men is 300ng/dL to 1,100ng/dL. That’s an enormous range! It’s like saying someone from Dallas lives near the Mexican border: They might live in the state next to Mexico, but it’s still 878 miles to the border. It’s not close at all.

A testosterone level of 400 ng/dL is far from optimal, even though it’s in the “state” of normal.

As far back as the 1970s, some endocrinologist actually knew the proper optimized range of total testosterone (800 to 1200ng/dL).

Dr. Dan Purser, Improving Male Sexuality, Fertility and Testosterone

Here we are, decades later, and the optimal range is rarely discussed. Many doctors don’t know of this “optimal” range. As a result, a doctor tells a guy he’s normal as long as his levels are above 300 ng/dl.

Identifying low testosterone in women is even more of a challenge. Their “normal” range is 15 to 70ng/dL. Because normal levels are so much lower in women, doctors often overlook the importance of measuring it.

Though their total levels are much lower, they still have a broad range in what’s considered “normal.” A woman can feel entirely different at a concentration of 15ng/dL versus 65ng/dL, even though she’d be considered normal in both circumstances.

The following two tables outline common signs and symptoms of low testosterone.

Signs and Symptoms of Low Testosterone in Men

Signs and Symptoms of Low Testosterone in Women

Low testosterone can cause cardiovascular disease, type 2 diabetes, loss of muscle, low bone density, reduced physical performance, decreased libido, depression, and cognitive decline.

In a study of almost 400 men under 50 years old who had low testosterone, one-third had low bone density. That’s a lot of men with a condition historically seen in women.

Low testosterone might also cause cognitive dysfunction, including the development of Alzheimer’s disease.

What Does Testosterone Do?

What doesn’t testosterone do? The following are some of the highlights.

Muscle Mass

Testosterone plays an important role in maintaining muscle mass in men and women. When you have more muscle, you not only move better, you also maintain healthier blood-sugar levels. It can help you look better, too.


As testosterone rises, so do levels of hemoglobin. Increasing testosterone can improve your ability to circulate oxygen throughout your body. Increasing testosterone levels may also resolve cases of anemia.

Insulin Resistance and Diabetes

Since muscle is the primary storage area of glucose, muscle loss contributes to insulin resistance, which can develop into type 2 diabetes.

If you have low testosterone, you are much more likely to develop type 2 diabetes in the next five years, even if you have no signs of diabetes today.

Bone Density

Testosterone is necessary for proper bone metabolism. Ten to 20 percent of men have osteoporosis, and low testosterone may be the leading cause.

Confidence and Mood

Low testosterone contributes to symptoms of depression. Sometimes people describe themselves as lacking ambition, drive, or passion.

At the other end of the extreme in testosterone levels, you find people with a desire to dominate others, with more aggressive behavior. While extreme levels of testosterone can cause someone to act like a jerk, optimal levels help you keep your head up and confidently ask for what you want in life.

The confidence-boosting effect is seen in women and men alike.

Researchers treated women with Social Anxiety Disorder (SAD) with a single dose of testosterone. A hallmark sign of SAD is “gaze avoidance” — they have trouble looking others in the eye. Following the testosterone treatment, the women with SAD had no trouble holding the gaze of someone else, suggesting their confidence went up and anxiety went down.

Cognitive Function and Emotional Control

In older men, those with higher testosterone have better memory and spatial awareness and display better strategic thinking. They also have better emotional control and reactions.

Women treated with testosterone also experience improvements in memory and spatial awareness.

If you’re a guy, and you cry more than you used to, or you tend to overreact to situations, your testosterone and estrogen might be out of balance.

Libido and Sexual Function

We can’t talk about the importance of testosterone and not speak of libido and sexual function. Higher testosterone levels almost always equal greater desire, interest, and pleasure in sex for both men and women.

For women, low libido is more often tied to depression or her emotional state. However, women with low testosterone often have low libido and rarely think about sex. They also deal with sexual dysfunction, such as dryness and discomfort during intercourse.

With about one in five married couples in a “sexless marriage,” low testosterone may be one of many causes.

What Lowers Testosterone?

The following are some of the major causes of low testosterone.

Overweight and Obesity

Low testosterone can increase body-fat levels, and increased body fat can lower testosterone. Together, they can create a vicious cycle of continued body-fat gain and reduced testosterone. Testosterone therapy decreases body fat and increases lean mass (muscle tissue).


Women are the most susceptible to stress-related drops in testosterone. In women, the adrenal glands contribute directly to testosterone production by producing testosterone itself, or hormone precursors, like DHEA.

Since the adrenal glands also produce the stress hormone cortisol, excessive physical or psychological stress in women can limit their ability to make testosterone.

Chronic stress can also reduce testosterone levels in men, but it often requires a lot more stress, or a more extended period of enduring it.

Sleep Debt

Sleep debt, or interrupted sleep, has been shown to lower testosterone and elevate cortisol levels.

A staggering 26 percent of middle-aged men have obstructive sleep apnea (OSA), which drastically limits testosterone production.

Testosterone is secreted in pulses during the 24-hour cycle. Your highest production takes place in the morning, so disrupted or insufficient sleep limits it.


Moderate-to-heavy alcohol consumption decreases testosterone. If you self-medicate with alcohol because of excessive stress and then sacrifice sleep because of your drinking, you create a triple-whammy on your testosterone production.


Rosuvastatin, which is sold under the label Crestor, was shown to suppress testosterone levels during a six-month study. Fortunately, testosterone levels climbed back up after discontinuing use.

Atorvastain (Lipitor) is also known to lower testosterone levels. The findings of one study recommended combining Lipitor and testosterone therapy, as patients had better outcomes than when using Lipitor alone.

The better question, though, is whether the Lipitor is appropriate for men in the first place. After all, elevated cholesterol is not necessarily a problem of its own, but rather a symptom of something else.

Head Trauma (Men)

Head trauma can damage the pituitary, which is what tells the testes to produce testosterone (pituitary damage in women affects estrogen production).

In some, the effects of head trauma are short-term, lasting days to weeks; others may not experience effects until years later. And still, in others, head trauma causes an immediate effect that never goes away. Doctors often overlook the pituitary as the cause of low testosterone in men.

Oral Contraceptives (Women)

Women using oral contraceptives often have lower testosterone levels, which is ironic. The contraceptive that’s used to prevent pregnancy can lead to low testosterone’s lack of libido, making sex less likely anyway.

Long-term Calorie Restriction

Calorie-restriction is a significant stress on the body. When you don’t provide enough nutrition, testosterone production declines. Excessive exercise, without sufficient nutrition does the same thing.

And you don’t have to be on a 500-calorie diet to see your testosterone plummet. You just have to continually under-nourish your body compared to the energy you expend.


Corticosteroids such as prednisone and cortisone can lower testosterone levels. If you use these medications on a daily basis, get your testosterone levels checked.

How Can You Increase Testosterone?

In men, the testes produce testosterone directly. The pituitary gland stimulates the hypothalamus, which stimulates the testes.

In women, it’s more complicated. For pre-menopausal women, a quarter of testosterone is produced by the ovaries, and another quarter is produced by the adrenal glands. The other half of testosterone is produced from hormone precursors, including androstenedione (the prohormone Mark McGwire allegedly used), and dehydroepiandrosterone (DHEA).

Androstenedione is banned and no longer available as a dietary supplement. DHEA is available as a dietary supplement, and is often recommended for women, to support optimal testosterone production.*

In my experience, it’s best to do everything you can with your lifestyle, exercise, nutrition, and supplementation. Then, if you still need help, hormone therapy can be an appropriate and safe way to optimize levels.

Vitamin D

In many studies, higher vitamin D is significantly associated with higher testosterone, although other smaller studies did not find this association. Vitamin D plays a role in many areas of metabolism, so supplementing with it is a must even if you have optimal testosterone levels already.


According to a study, on evenings when couples had sex, their testosterone levels increased. On evenings when they didn’t, testosterone levels fell. If you need another good reason to make love to your spouse, there you go.

Another study found that for women who were not on hormonal contraceptives, just thinking sexual thoughts increased testosterone. Those on contraceptives did not experience the testosterone boost.

It’s also believed that a woman’s psychological state can affect testosterone. When she feels sexy, her testosterone levels go up.

Animal Protein

Eat animal-based protein, which is a good source of saturated and monounsaturated fats. It also contains cholesterol, which can be used by the body to make testosterone.

Red Wine

Because of its resveratrol content, a single drink of red wine can increase testosterone levels. Be careful though: More than a serving of alcohol can reduce it.

Resistance Training

One study showed resistance training increased testosterone levels by 30 percent. Another study showed hypertrophy-style training increased levels 136 percent, while strongman-style training increased testosterone 74 percent.

Resistance training increases testosterone for a short period, during and after exercise. But by exercising five to six days a week, week-after-week, the long-term effects can be significant over time.


Sufficient, quality sleep is one of the most influential ways to maximize hormone production. Most hormones rely on a healthy circadian rhythm. If you don’t get enough sleep, or you go to sleep at inconsistent times, you’ll disrupt your circadian rhythm and sabotage your body’s hormone production.

Supplements, HCG, and Hormone Therapy

While we’ve included a long list of references for this article — and there are many more we’ve reviewed but didn’t include — there is far more anecdotal evidence than published human studies.

Many of the herbs below have been used for hundreds, if not thousands of years. And contrary to what the media would have you believe, dietary supplements have a solid safety record.

We left the history lessons out of this article, but if you’re into history or geography, you might be fascinated to learn where many of the plants come from and how they’ve been used in traditional medicine.

Most of our knowledge of natural therapies has been passed down through generations. It’s the result of experimentation. Even today, we can learn a lot from our own experiments.

The Foundational Five

As we explain in the article on The Foundational Five, don’t waste time and money on targeted supplements if you don’t have a solid foundation with the Foundational Five first. Shorting yourself on those micronutrients not only affects your overall health, but can also directly or indirectly affect testosterone.

Tribulus Terrestris

Tribulus terrestris is also known as Gokshur, Gokharu, and puncture vine. Both men and women seem to benefit from tribulus terrestris. Although this article is about testosterone, we felt it was valuable to highlight some of the other benefits of tribulus terrestris.

Tribulus terrestris contains saponins, which increase luteinizing hormone (LH), testosterone, estrogen, and other hormones. Other constituents increase DHEA, which can convert to testosterone.

Supplementing with tribulus improved sexual desire, vaginal lubrication, and arousal. Women with hypoactive sexual desire disorder who took 750mg/day of tribulus terrestris experienced improved sexual desire and elevated testosterone levels. Women with elevated blood sugar experienced lower glucose levels following supplementation.*

An animal study showed tribulus terrestris reduced symptoms of depression.* Depression and testosterone levels are often related, possibly because the depressed feelings contribute to reduced testosterone, or because the lower testosterone increases feelings of depression. It’s also possible that depression stems from a disruption in the hypothalamus, which also affects testosterone levels.

In animal studies, tribulus terrestris prevented increases in total cholesterol and triglycerides in animals with normal levels and lowered total cholesterol, LDL, and triglycerides in those with elevated levels.*

Other studies on animals showed that tribulus terrestris supports healthy brain function, protects the liver, helps maintain normal inflammatory levels, dulls pain, and may protect cells from the development of cancer.*

In a study of rugby players, the addition of tribulus terrestris to a training program did not enhance muscle mass or strength more than the training program alone. However, in a study of men with low testosterone levels, a dose of 250mg, three times per day, did improve testosterone levels and erectile function.*


Ashwagandha (also known as Withania somnifera, Indian Ginseng, and Winter Cherry) is an adaptogenic herb that has been shown to support healthy blood pressure, stimulate thyroid function, maintain normal cortisol levels, and support optimal testosterone levels.*

In a double-blind, placebo-controlled study of exercising men, supplementation with ashwagandha significantly increased testosterone levels compared with the placebo group. Muscle strength and size was greater, body-fat percentage improved more, and muscle recovery were also enhanced in the supplemented group compared to the control group.

Ashwagandha supplementation increased testosterone levels in infertile men. Like tribulus, ashwagandha has also been shown to improve sexual function and interest in women. Whether it’s a result of increased testosterone, reduced stress levels, or something else, remains to be determined.

Others Herbs and Extracts to Consider

Fenugreek (also known as Trigonella foenum-graecum) is another adaptogen that seems to support optimal testosterone levels, possibly by helping to modulate cortisol levels. As with tribulus, fenugreek also seems to support those with symptoms of polycystic ovary syndrome (PCOS).

Longjack root, or Tongkat Ali, grows in Malaysia, Indonesia, and Vietnam. Evidence suggests it supports optimal testosterone levels in both men and women.

To avoid making a book out of this article, let me just suggest some other herbs and extracts that have good anecdotal evidence, even if scientific research hasn’t yet supported them: Horny Goat Weed (epimedium), Maca, Holy Basil, Coleus forskohlii, Cordyceps, and Velvet Antler.


Zinc deficiency is common throughout the world. Of all the vitamins and minerals, zinc deficiency has been most clearly associated with low testosterone. When zinc-deficient men supplemented with zinc for six months, their testosterone levels almost doubled!

Lower vitamin D levels are also associated with low testosterone.

Other micronutrients, including vitamin C, boron, conjugated linoleic acid, and magnesium might also play a role in testosterone production.

This underscores the importance of supplementing with a high-quality multivitamin.

Managing Estrogen

In some people, the issue with their hormones is not that testosterone is too low: It’s that estrogen is too high.

In men, excess estrogen can lead to gynecomastia, a decrease in facial hair, and other feminine characteristics. In women, excess estrogen can lead to “estrogen dominance.”

Though they are not necessarily “testosterone-enhancing,” aromatase-inhibitors block the conversion of testosterone to estrogen, leaving more testosterone available as testosterone. With less estrogen, testosterone has a more powerful effect. Other supplements enhance the removal of estrogens from the body.

Indole-3-carbinol (I3C), and Diindolylmethane (DIM) — found in cruciferous vegetables — help to support normal estrogen levels. I3C is a precursor of DIM, and there is a lot of debate about which one is better. In my opinion, it’s just trial and error to see which works better for you.

One of the easiest and cheapest ways to help normalize estrogen levels is to eat more fiber. Fiber binds to estrogens in the intestines and helps remove them from the body.

Is testosterone therapy bad?

It’s important to do whatever you can to naturally support optimal health, including your hormones. However, these changes may not be sufficient for some people to achieve optimal testosterone levels.

Too often, people dig their heels in, refusing to use any medication or prescription, while they needlessly suffer from symptoms of poor health.

You may be better off using a prescription and feeling your best, than feeling lousy and remaining “all natural.”

It’s worth repeating, though: Don’t just go with pharmaceuticals because it sounds easier than taking care of your health naturally.

The two most common medical options are human chorionic gonadotropin (HCG) and exogenous testosterone.

HCG stimulates the production of testosterone, just as luteinizing hormone does. Exogenous testosterone bypasses the body’s job in producing testosterone, and you get it into your body on your own.

Should teens or young adults use testosterone-boosting supplements?

Most sports performance supplement consumers are high-school and college-aged young adults.

While there are a lot of kids today who are unhealthy and display symptoms of low testosterone and/or excessive estrogen, this is most often the result of their lifestyle and nutrition choices. Introducing testosterone-boosting supplements would be a waste of money.

For young adults who are healthy and fit, we wouldn’t expect them to see much of a difference from using these supplements. Their bodies are at their hormonal peak. Young adults can maximize what their bodies are meant to do without using testosterone-boosters.

Avoid using testosterone-boosting supplements until reaching an age where hormone levels start to decline (usually around age 30).

Wrapping it Up

Don’t suffer from the symptoms of low testosterone. Life is more fun and exciting when your testosterone levels are optimal. And your attitude may be a lot better, too, which others will appreciate.

There’s so much you can do to maintain optimal levels at any age, but remember: You don’t have to take all of this on at once.

Start with your nutrition and lifestyle choices. Then get in the habit of strength training three to four times per week. And while you make these longer-term changes, experiment with some of these nutritional supplement options above.


Keep the conversation going.

Leave a comment, ask a question, or see what others are talking about in the Life Time Health Facebook group.

The Life Time Health Team

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