Mood swings, heavy periods, weight gain around the hips, breast tenderness, and feeling wired but exhausted — these are not just “normal” parts of being a woman. They may be signs of oestrogen dominance.
What Is Oestrogen Dominance?
Oestrogen dominance occurs when oestrogen levels are high relative to progesterone — either because oestrogen is genuinely elevated, or because progesterone has dropped too low to balance it. It is one of the most common hormonal imbalances in women of reproductive age, perimenopause, and beyond.
It’s important to understand that oestrogen dominance is not simply about having “too much oestrogen.” It’s about the ratio between oestrogen and progesterone. Even women with low oestrogen can experience oestrogen dominance if their progesterone is lower still.
Why Does It Happen?
1. Impaired Oestrogen Detoxification
The liver is responsible for metabolising and clearing oestrogen from the body. When liver function is compromised — through poor diet, alcohol, medications, or toxic load — oestrogen recirculates rather than being excreted. The gut also plays a critical role: an imbalanced microbiome can reactivate oestrogen that should have been eliminated, a process driven by an enzyme called beta-glucuronidase.
2. Xenoestrogens
Environmental oestrogens — found in plastics (BPA, BPS), pesticides, personal care products, and synthetic fragrances — mimic oestrogen in the body and bind to oestrogen receptors, amplifying oestrogenic activity without raising actual oestrogen levels on a blood test.
3. Chronic Stress and Cortisol
Cortisol and progesterone share the same precursor: pregnenolone. Under chronic stress, the body prioritises cortisol production — a phenomenon known as “pregnenolone steal” — leaving insufficient substrate for progesterone synthesis. Lower progesterone = relative oestrogen dominance.
4. Excess Body Fat
Adipose (fat) tissue contains an enzyme called aromatase, which converts androgens into oestrogen. Higher body fat = higher oestrogen production, independent of ovarian output.
5. Perimenopause
In the years leading up to menopause, progesterone often declines faster than oestrogen, creating a window of relative oestrogen dominance even as overall hormone levels fall.
Common Symptoms of Oestrogen Dominance
- Heavy, painful, or irregular periods
- PMS — mood swings, irritability, anxiety, depression
- Breast tenderness or fibrocystic breasts
- Weight gain, particularly around hips, thighs, and abdomen
- Bloating and fluid retention
- Fatigue and poor sleep
- Brain fog and poor concentration
- Fibroids or endometriosis
- Low libido
- Thyroid dysfunction (oestrogen can impair thyroid hormone binding)
How to Rebalance: A Clinical Approach
1. Support Oestrogen Metabolism with DIM and Calcium-D-Glucarate
DIM (Diindolylmethane) is a compound derived from cruciferous vegetables that promotes the conversion of oestrogen into its safer, less proliferative metabolites — specifically shifting the ratio toward 2-hydroxyoestrone and away from the more potent 16-alpha-hydroxyoestrone.
Calcium-D-Glucarate inhibits beta-glucuronidase in the gut, preventing the reactivation and reabsorption of oestrogen that has already been processed by the liver.
2. Optimise Liver Detoxification
Phase I and Phase II liver detoxification pathways are essential for oestrogen clearance. Key nutrients include B vitamins, glutathione, N-acetyl cysteine, and milk thistle (silymarin).
- Detox & Liver Support
- Designs For Health Hepatatone Plus 120vc
- Gaia Milk Thistle Liver & Cleanse Support 60vcaps
- Coyne Liposomal Bio-Milk Thistle Complex 30caps
3. Support Progesterone with Vitex (Chaste Tree)
Vitex agnus-castus (chaste tree berry) acts on the pituitary gland to support luteinising hormone (LH) production, which in turn stimulates progesterone synthesis in the second half of the menstrual cycle. It is one of the most well-researched herbal medicines for PMS and cycle irregularity.
4. Address Perimenopause Symptoms
For women in perimenopause experiencing the full spectrum of oestrogen dominance symptoms alongside declining hormones, targeted support can make a significant difference.
5. Reduce Stress and Support the HPA Axis
Addressing the cortisol-progesterone connection is essential. Adaptogenic herbs and magnesium support adrenal resilience and help restore the pregnenolone balance.
Lifestyle Factors That Matter
- Reduce xenoestrogen exposure — switch to glass or stainless steel food storage, choose organic produce where possible, and audit personal care products for parabens and synthetic fragrances.
- Support gut health — a diverse, fibre-rich diet reduces beta-glucuronidase activity and supports oestrogen excretion.
- Prioritise sleep — melatonin has anti-oestrogenic properties and is produced during deep sleep.
- Move your body — regular exercise reduces aromatase activity and supports healthy body composition.
- Limit alcohol — even moderate alcohol consumption impairs hepatic oestrogen metabolism.
A Note on Testing
If you suspect oestrogen dominance, a DUTCH test (Dried Urine Test for Comprehensive Hormones) is the gold standard for assessing oestrogen metabolites, progesterone, cortisol, and adrenal function in a single test. Speak with your practitioner about whether this is appropriate for you.
Our team is available for personalised guidance — contact us anytime.
Disclaimer: This blog is for informational purposes only and does not constitute medical advice. Please consult a qualified health professional for personalised recommendations.