The 4 Best Supplements for Fertility
While no pill or drink can replace a healthy diet and lifestyle, emerging research has shown that taking certain dietary supplements can improve your fertility. Here's our list of the Top 4 dietary supplements women with PCOS should consider taking to improve their fertility.
Recognized as a vitamin and a hormone, Vitamin D receptors have now been identified in almost every tissue and cell in the human body. This Vitamin has also been found to be involved in follicle egg maturation and development.
In a small trial study of 13 women with PCOS who were deficient in Vitamin D, normal menstrual cycles resumed within 2 months in 7 of the 9 women who had irregular menstrual cycles when given Vitamin D repletion with calcium therapy (1). Two women even established pregnancies. The authors of the study suggest that abnormalities in calcium balance may be responsible, in part, for the arrested follicular development in women with PCOS and may even contribute to the pathogenesis of the syndrome (1,2).
Low Vitamin D levels were found to be associated with lower rates of follicle development and pregnancy after stimulation with clomid in women with PCOS (3).
You can read more about the importance of Vitamin D for PCOS here
Omega-3 fats, specifically long-chain eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) found in cold-water fish may help with fertility in women with PCOS. One study showed androgen concentrations in young women with PCOS were significantly reduced after supplementation of long-chain omega-3 fats (4).
Women with PCOS who were not obese were given 1,500 mg of omega-3 fats daily for six months. BMI plus insulin levels decreased significantly during treatment. Additionally, serum LH and testosterone levels decreased, and SHBG levels increased significantly (5).
Unless you eat cold-water fish (like tuna, trout, salmon) at least twice a week, you may want to consider supplementing your diet with fish oil.
To learn more about the benefits of fish oil for PCOS, check out our previous blog posts here
Myo-inositol (MYO) is perhaps the most researched nutritional supplement for PCOS. A relatives of the B complex vitamins, MYO has shown favorable results in improving nearly all aspects of PCOS, including insulin sensitivity, reproduction (restores ovulation and improves oocyte quality), hormonal imbalance, (improves androgens) and metabolic issues (inflammation, dyslipidemia, hypertension, and weight loss). There is also evidence that taking MYO in pregnancy can reduce the rates of gestational diabetes (6).
In regards to fertility, MYO improved oocyte quality better than d-chiro inositol (DCI). MYO has also been demonstrated to restore ovulation. Twenty-two of 25 women with PCOS had restored menstrual cycle with six months of MYO treatment; 72% of them maintained normal ovulation, and 40% became pregnant (7).
One study compared ovulation rates in women treated with MYO versus metformin. Sixty women received 1,500 mg/day of metformin, while 60 women received 4 g/day of MYO plus 400 mcg of folic acid. Ovulation was restored in 65% of women treated with MYO vs. 50% in the metformin group. More pregnancies occurred in the MYO group vs. metformin (18% vs. 11%) (8).
Read more about myo-inositol for PCOS here
N-acetylcystine (NAC) is both an antioxidant and amino acid. Specifically, it's a derivative of the amino acid L-cysteine, an essential precursor used by the body to produce glutathione, an antioxidant that protects against free radical damage and oxidative stress and is a critical factor in supporting a healthy immune system.
A study published in the European Journal of Obstetrics, Gynecology, and Reproductive Biology compared the effects of NAC and metformin in women with PCOS. In this prospective trial, 100 women were divided to receive either metformin (500 mg three times daily) or NAC (600 mg three times daily) for 24 weeks. Both treatments resulted in significant and equal decreases in BMI, hirsutism, fasting insulin, free testosterone, and menstrual irregularity (9).
Three randomized studies compared NAC or metformin with Clomid in women with PCOS. In two of the studies, Clomid plus NAC resulted in improved ovulation and pregnancy rates compared with placebo (10-12).
You can read more about the benefits of NAC for PCOS in our previous blog post here
To read our discolsure statement, click here
If you are interested in learning more about these supplements, including additional research, side effects and dosage, schedule a nutrition counseling session with one of our dietitian nutritionists. You may also be interested in our Popular Supplements for PCOS Webinar –available for instant download today!
As always, please consult with your doctor before taking any dietary supplement.
1. Thys-Jacobs S, Donovan D, Papadopoulos A, Sarrel P, Bilezikian JP. Vitamin D and calcium dysregulation in the polycystic ovarian syndrome. Steroids 1999 Jun;64(6):430-5.
2. Lerchbaum E, Obermayer-Pietsch B. Vitamin D and fertility: a systematic review. European J Endocrinol. 2012;166(5):765-778.
3. Ott J, Wattar L, Kurz C, et al. Parameters for calcium metabolism in women with polycystic ovary syndrome who undergo clomiphene citrate stimulation: a prospective cohort study. European J Endocrinol. 2012;166(5):897-902.
4. Phelan N, O'Connor A, Kyaw Tun T, et al. Hormonal and metabolic effects of polyunsaturated fatty acids in young women with polycystic ovary syndrome: results from a cross-sectional analysis and a randomized, placebo-controlled, crossover trial. Amer J Clin Nutr. 2011;93(3):652-662.
5. Oner G, Muderris, II. Efficacy of omega-3 in the treatment of polycystic ovary syndrome. J. Obstet Gynaecol. 2013;33(3):289-291.
6. D'Anna R, Di Benedetto V, Rizzo P, et al. Myo-inositol may prevent gestational diabetes in PCOS women. Gynecol Endocrinol. 2012;28(6):440-442.
7. Papaleo E, Unfer V, Baillargeon JP, et al. Myo-inositol in patients with polycystic ovary syndrome: a novel method for ovulation induction. Gynecol Endocrinol. 2007;23(12):700-703.
8. Raffone E, Rizzo P, Benedetto V. Insulin sensitiser agents alone and in co-treatment with r-FSH for ovulation induction in PCOS women. Gynecol Endocrinol. 2010;26(4):275-280.
9. Oner G, Muderris II. Clinical, endocrine and metabolic effects of metformin vs N-acetyl-cysteine in women with polycystic ovary syndrome. Eur J Obstet Gynecol Reprod Biol. 2011 Aug 8.
10. Salehpour S, Akbari Sene A, Saharkhiz N, Sohrabi MR, Moghimian F. N-acetylcysteine as an adjuvant to clomiphene citrate for successful induction of ovulation in infertile patients with polycystic ovary syndrome. J Obstet Gynaecol Res. 2012;38(9):1182-1186.
11. Abu Hashim H, Anwar K, El-Fatah RA. N-acetyl cysteine plus clomiphene citrate versus metformin and clomiphene citrate in treatment of clomiphene-resistant polycystic ovary syndrome: a randomized controlled trial. J Women's Health (2002). 2010;19(11):2043-2048.
12. Rizk AY, Bedaiwy MA, Al-Inany HG. N-acetyl-cysteine is a novel adjuvant to clomiphene citrate in clomiphene citrate-resistant patients with polycystic ovary syndrome. Fertil Steril. 2005;83(2):367-370.