Natural Ways to Boost Fertility: What Actually Works (and What Does Not)

Natural ways to improve fertility: what the evidence supports

This page separates what has evidence from what is simply popular.

Best evidenced

Stopping smoking. Affects both partners — egg quality, sperm parameters and IVF outcomes.

Weight, at both ends. A BMI above 30 is associated with irregular ovulation and poorer treatment outcomes; being significantly underweight suppresses ovulation. In PCOS, 5 to 10% weight loss can restore ovulation without any medication.

Treating what is treatable — thyroid dysfunction, raised prolactin, diabetes, vitamin D deficiency.

Timing sex to the fertile window, without over-engineering it.

For men: stopping testosterone and anabolic steroids, reducing heat exposure, moderating alcohol. Allow three months for changes to show.

Reasonable but less certain

Regular moderate exercise. Improves insulin sensitivity, which matters particularly in PCOS. Note that heavy exercise combined with low energy availability can suppress ovulation entirely — functional hypothalamic amenorrhoea.

Sleep. Plausible mechanism, limited direct evidence on conception rates.

Reducing chronic stress. Helps wellbeing. The evidence that it improves conception rates specifically is weak.

Weaker than the marketing suggests

Antioxidant supplements for men. A Cochrane review of 90 trials in 10,303 subfertile men found a possible live birth increase — which disappeared when studies at high risk of bias were removed. Evidence rated very low certainty and described as inconclusive, with insufficient evidence for any specific product.

Inositol in PCOS. Some studies show benefit, others little. ESHRE (2026) recommends against myo-inositol in the IVF stimulation setting.

DHEA. ESHRE (2026) recommends against it, in both low and normal responders. Strong recommendation.

Specific "fertility diets". No particular diet has been shown to improve conception rates. General healthy eating is worthwhile; restrictive protocols are not evidenced.

What natural approaches cannot fix

Blocked tubes. Significantly reduced ovarian reserve. Substantial male factor. Uterine abnormalities.

This is the important limit. Lifestyle change is genuinely worth doing — and it will not overcome a structural or severe cause. If you have been trying for the recommended period, pursue assessment alongside rather than exhausting natural approaches first.

A note on traditional preparations

Many people combine approaches, and that is reasonable. Two cautions: tell both practitioners everything you take, as some preparations interact with fertility medications or affect liver and thyroid test results. And source from licensed manufacturers — unregulated preparations have been found to contain heavy metals including lead and mercury.

The honest summary

Lifestyle matters, in both directions less dramatically than claimed. Do the well-evidenced things, be sceptical of the rest, and do not let either delay assessment.