What does oestradiol do?

Oestradiol is one of the main forms of oestrogen in the body and it plays a vital role in many areas of health. It is often thought of as a hormone that only affects women but oestradiol is important for men too.

From supporting reproductive health to maintaining strong bones and regulating mood, oestradiol helps keep several body systems working as they should.

Below, we take a closer look at what oestradiol does, how levels can change at different stages of life, signs that something might be out of balance and when testing can be helpful.

##What is oestradiol?

Oestradiol is the strongest and most active form of oestrogen. It is produced mainly in the ovaries before the menopause. After the menopause the body makes smaller amounts in other tissues, such as fat cells and the adrenal glands.

Men also produce oestradiol in small amounts. In men it is made when testosterone is converted into oestradiol. Oestradiol acts as a chemical messenger. It travels through the bloodstream and attaches to receptors in different tissues where it triggers specific responses. These responses affect a wide range of processes throughout the body.

##What does oestradiol do in the body?

Oestradiol has several important functions. Some of the key roles include:

Supports the menstrual cycle and fertility Before the menopause oestradiol helps regulate the menstrual cycle. Levels rise in the first half of the cycle and help the uterine lining thicken so it is ready for a potential pregnancy. Oestradiol also helps trigger ovulation. Without the right balance of oestradiol the cycle can become irregular and fertility may be affected.

Maintains bone strength Healthy bones rely on oestradiol. It helps control how bone tissue is broken down and rebuilt. When oestradiol levels fall, bone loss can speed up which increases the risk of osteoporosis. This is why bone health becomes especially important after the menopause when natural oestradiol levels decline.

Supports heart and blood vessel health Oestradiol helps maintain the flexibility of blood vessels which supports healthy circulation. It also has a protective effect on cholesterol levels by helping maintain a favourable balance between HDL and LDL. Lower levels of oestradiol after the menopause may contribute to changes in cardiovascular risk.

Helps regulate mood Oestradiol interacts with brain chemicals that influence mood, such as serotonin. Fluctuating levels can affect emotional wellbeing which is why some people notice mood changes around their menstrual cycle or during perimenopause. Consistently low levels can contribute to symptoms such as low mood and irritability.

Supports the skin and hair Oestradiol helps maintain skin elasticity by supporting collagen production. Levels that are too low can contribute to dryness or thinning of the skin. Oestradiol also plays a role in hair growth by helping keep hair in its active growth phase for longer.

Important for men too Men need oestradiol as well. It helps support bone strength, maintains healthy libido and plays a role in sperm production. Very low levels in men can lead to low mood, fatigue, reduced sexual function and bone loss. Maintaining the right balance of testosterone and oestradiol is important for long term health.

##What causes low oestradiol?

There are several reasons why oestradiol levels may be lower than expected. Some common causes include:

Natural changes with age As women approach the menopause the ovaries gradually produce less oestradiol. Levels can fluctuate widely during perimenopause which leads to symptoms such as irregular periods, hot flushes, mood changes and sleep difficulties.

Primary ovarian insufficiency This condition occurs when the ovaries stop working properly before the age of 40. It can lead to very low oestradiol levels and irregular or absent periods.

Excessive exercise or low body weight Very high levels of physical activity or low body fat can affect hormone production. The body may reduce oestradiol levels when it senses there is not enough energy available to support reproduction.

Thyroid conditions Thyroid hormones help regulate several reproductive hormones. An underactive or overactive thyroid can contribute to changes in oestradiol levels.

High stress levels Chronic stress can affect the balance of hormones made by the adrenal glands. Over time this may disrupt oestradiol production or cause irregular cycles.

Certain medical treatments Some medications, such as those used for fertility treatment or treatment for breast cancer, can influence oestradiol levels. Chemotherapy and radiotherapy can also affect ovarian function.

##What causes high oestradiol?

Although less common, oestradiol can also be higher than expected.

Causes can include:

• Polycystic ovary syndrome
• Ovarian cysts
• Obesity, which can increase the amount of oestradiol made in fat tissue
• Certain hormone medications
• High levels of stress
• Liver conditions that affect hormone processing

High oestradiol can lead to symptoms such as bloating, irregular periods, tender breasts or mood changes. In men it may contribute to reduced libido or changes in body composition.

##Signs your oestradiol might be out of balance

Because oestradiol affects several systems in the body, several signs can suggest levels may be too low or too high.

These can include:

• Irregular or missed periods
• Hot flushes or night sweats
• Low libido
• Vaginal dryness
• Mood swings or low mood
• Fatigue
• Difficulty sleeping
• Hair thinning
• Changes in skin texture
• Unexplained weight changes

These symptoms can also be linked to other health issues so testing can be useful if you want a clearer picture.

##When to consider an oestradiol test

An oestradiol test can help identify whether your levels are within the expected range for your age and stage of life.

Testing is often helpful if you:

• Are experiencing symptoms of perimenopause or menopause
• Have irregular or absent periods
• Have fertility concerns
• Are noticing hair or skin changes
• Want to understand your baseline hormone levels
• Are monitoring how lifestyle changes are affecting your hormones
• Have been advised to check hormone levels before starting a treatment

Many people choose to test oestradiol as part of a wider hormone profile which gives a clearer overview of how different hormones are working together.

##How lifestyle can support healthy oestradiol levels

Your daily habits can influence hormone balance. Some helpful steps include:

Eating a balanced diet A diet with a mix of healthy fats, whole grains, lean proteins and plenty of fruit and vegetables supports overall hormone health. Foods rich in phytoestrogens, such as flaxseeds and soy, may be helpful for some people.

Managing stress Chronic stress affects the endocrine system and can disrupt several hormones at once. Relaxation techniques, regular movement and good sleep can all support hormone balance.

Regular physical activity Moderate exercise can help support healthy oestradiol levels. However, very intense training without adequate recovery can have the opposite effect.

Maintaining a healthy weight Being significantly under or overweight can influence how hormones are produced and processed. Working towards a healthy weight range can support more stable oestradiol levels.

##Understanding your hormone health

If you want a clear view of your oestradiol levels, a simple blood test can provide helpful insights. Bluecrest Wellness offers a range of Male and Female Hormone Profiles that check oestradiol alongside other key hormones to give a clearer picture of your hormonal health. You will receive a detailed results report that explains your readings in plain language and highlights when further advice may be helpful.

Understanding your hormone health can be the first step toward feeling more energised and supporting your long term wellbeing.

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