Your immune system is not just your defence against illness — it is the gatekeeper of pregnancy. Understanding how to calm, regulate, and support it is one of the most powerful things you can do for your fertility.
The Science
For a pregnancy to establish, your immune system must perform something extraordinary: it must recognise a foreign body — the embryo, which carries your partner's DNA — and choose not to attack it.
This is not a passive process. It requires a precise shift in immune activity — from a Th1-dominant (inflammatory, attack) state to a Th2-dominant (tolerant, protective) state. Regulatory T-cells (Tregs) orchestrate this shift, creating an immunological environment in which the embryo can implant and the placenta can develop.
When the immune system is chronically activated — by inflammation, autoimmunity, nutritional deficiencies, or environmental toxins — this tolerance response is impaired. The result can be implantation failure, early pregnancy loss, or poor placental development.

40%
of recurrent miscarriage cases involve immune dysregulation
14–67%
of women with implantation failure have subclinical endometritis
1 in 9
Australian women have endometriosis — an immune-inflammatory condition
2–3×
increased miscarriage risk with elevated thyroid antibodies, even with normal TSH
Root Causes
Tap each driver to understand the physiological mechanism and the clinical action.
Conditions
These four conditions are the most clinically significant immune-related factors in fertility. Each includes the optimal lab ranges, fertility impact, and evidence-based interventions.

Nutritional Medicine
These six nutrients have the strongest evidence base for modulating immune function and reducing fertility-related inflammation.
Herbal Medicine
These herbs are prescribed as part of a personalised protocol based on your specific immune pattern. They are not over-the-counter recommendations — dosage, combination, and timing are critical. Always use under practitioner guidance.

Your Action Plan
Work through these steps with your practitioner. Tick each one as you complete it.
Testing
Nutrition
Supplements
Lifestyle