Folate, Vitamin D, and PCOS

If you have Polycystic Ovary Syndrome (PCOS) and are hoping to start a family, you are not alone. PCOS is a common hormonal disorder that may affect fertility, but there is a growing body of evidence suggesting that targeted nutritional support may play a meaningful role in managing the condition.

Two nutrients in particular, folate and vitamin D, have good evidence behind them for women with PCOS (PMOS), and are both recommended by the NHS for women during preconception and pregnancy.

An important update: On 12 May 2026, an international consensus published in The Lancet renamed Polycystic Ovary Syndrome (PCOS) to Polyendocrine Metabolic Ovarian Syndrome (PMOS). The new name reflects the condition's wider hormonal and metabolic effects, including the role of insulin resistance and nutrient deficiencies such as vitamin D, which we explore below. Both names will be used during the transition to the 2028 ICD update. Read our explainer on what the rename means for your hormones and fertility.

The importance of folate for PCOS (PMOS)

Folate, also known as vitamin B9, is a water-soluble vitamin important for DNA synthesis and repair, as well as healthy cell division. In the context of PCOS (PMOS), folate may play a role in supporting ovulation and improving conditions for conception.

Research suggests folate may support the development of healthy eggs and help maintain the integrity of genetic material within them. This is particularly relevant for women with PCOS (PMOS), who may experience irregular ovulation and hormonal imbalances that affect egg quality.

Folic acid vs folate: why the distinction matters for PCOS (PMOS)

It is worth understanding the difference between folate and folic acid. Both are forms of vitamin B9, but folate is the naturally occurring form found in foods, while folic acid is the synthetic form commonly used in supplements and fortified foods.

For some women with PCOS (PMOS), metabolising folic acid efficiently may be more difficult due to a variation in the MTHFR gene that affects conversion. Natural, bioavailable folate such as methylfolate or Quatrefolic may be better absorbed and utilised by the body in these cases. You can find folate naturally in leafy greens, legumes and citrus fruits, though supplementation is often recommended to reach the levels associated with benefit.

The NHS recommends 400mcg of folic acid or folate daily for women trying to conceive. Zita West Inositol and Folate uses Quatrefolic, a bioavailable form of folate, providing the recommended amount alongside myo-inositol for combined PCOS support. Read more about the difference between folate and folic acid here.

Vitamin D and PCOS (PMOS)

Vitamin D deficiency is particularly common in women with PCOS (PMOS) and research suggests it may contribute to irregular menstrual cycles and insulin resistance, two of the defining features of the condition. Studies indicate that correcting vitamin D deficiency may support more regular hormonal cycling and improved insulin sensitivity in women with PCOS (PMOS), though more large-scale research is ongoing.

Vitamin D also plays a broader role in immune function, bone health and inflammation, all of which are relevant in the context of PCOS (PMOS) where low-grade inflammation is a commonly associated feature.

Vitamin D3: the preferred form for supplementation

Vitamin D3 (cholecalciferol) is the form of vitamin D produced by the skin in response to sunlight and is generally considered more effective at raising vitamin D levels in the bloodstream compared to vitamin D2. For women with PCOS (PMOS) who may be deficient, a daily vitamin D3 supplement may be a practical way to maintain adequate levels, particularly in the UK where sunlight is limited for much of the year.

A combined approach to nutritional support for PCOS (PMOS)

Folate and vitamin D each address different aspects of PCOS (PMOS) but both sit within a broader nutritional picture. Research suggests that a combined approach addressing insulin sensitivity, inflammation, hormonal balance and egg quality may be more effective than any single nutrient in isolation.

Alongside folate and vitamin D, nutrients including myo-inositol, NAC, omega-3 fatty acids and probiotics each have evidence suggesting they may support different aspects of PCOS (PMOS) management.

While nutritional support may be beneficial, it works best alongside a healthy lifestyle including regular moderate exercise, a balanced diet low in refined carbohydrates and stress management. Consulting with a healthcare provider experienced in PCOS (PMOS) management is also important for personalised guidance.

FAQs: folate, vitamin D and PCOS (PMOS)

Why is folate important for PCOS (PMOS)?

Folate may support egg development, DNA integrity and ovulation, all of which may be affected by the hormonal imbalances associated with PCOS (PMOS). Bioavailable folate such as Quatrefolic may be preferable to synthetic folic acid for some women with PCOS due to MTHFR gene variations that affect conversion efficiency.

Should I take folic acid or folate if I have PCOS (PMOS)?

We recommend a bioavailable form of folate such as methylfolate or Quatrefolic rather than synthetic folic acid, particularly for women with PCOS (PMOS) who may have difficulty converting folic acid efficiently. Zita West Inositol and Folate uses Quatrefolic for this reason. Read more about the difference here.

Is vitamin D deficiency common in PCOS (PMOS)?

Yes. Research consistently shows that vitamin D deficiency is more prevalent in women with PCOS (PMOS) than in the general population, and low levels are associated with more severe insulin resistance and hormonal irregularity. Daily vitamin D3 supplementation may be particularly relevant for women with PCOS (PMOS) in the UK where sunlight is limited.

What is the difference between PCOS and PMOS?

PMOS (Polyendocrine Metabolic Ovarian Syndrome) is the new name for PCOS, adopted following an international consensus published in The Lancet in May 2026. The condition is the same but the new name better reflects its wider hormonal and metabolic effects. Read our full explainer on the rename.

Can I take folate and vitamin D together for PCOS (PMOS)?

Yes. Folate and vitamin D address different aspects of PCOS (PMOS) and may be taken together safely. Both are included in the Zita West PCOS Support Pack alongside other nutrients relevant to the condition. If you are unsure which products are right for your situation, book a free 1:1 fertility product consultation with our team.

External references: NHS: Vitamins, supplements and nutrition in pregnancy  |  The Lancet: PMOS consensus 2026

This content is for educational purposes only and is not intended to diagnose, treat, or replace medical advice. Always consult your healthcare provider before starting any new supplement.