black cohosh for pcos

Fact: black cohosh is a plant that has been shown to regulate hormones and support ovulation in women with PCOS.

Another fact: finding reliable information on the use of black cohosh for pcos usually means digging through not-so-fun research papers.

Thankfully, I’m a geek and I love reading research papers 🙂 So, I’ve done all the digging for you and I’ve compiled the 5 main things that you should know about black cohosh and pcos, which are:

  • the key benefits of black cohosh.
  • how black cohosh works.
  • the recommended dosage to take.
  • how long to use black cohosh.
  • side effects and safety precautions to be aware of.

By the end of this post you should have a clear understanding of how this Native American herb can help you overcome pcos symptoms.

Let’s go!

Note: this post contains affiliate links and I earn a commission (at no additional cost to you) if you use them to make a purchase.


According to this 2013 study black cohosh is an effective natural remedy for stimulating ovulation in women with PCOS.

In fact, that study concludes that black cohosh can be used as a natural alternative to the prescription drug clomid (clomiphene citrate).

Furthermore, when comparing women who took black cohosh vs. women who took clomid, the study found that black cohosh:

  • increases progesterone.
  • thicker endometrium.
  • lower LH (luteinizing hormone) levels and FSH/LH ratio (follicle stimulating hormone to luteinizing hormone ratio).

In addition, black cohosh has insulin-regulating properties and anti-inflammatory properties, that can help a lot with PCOS symptoms.

To understand how all of the above helps with ovulation and fertility, let’s break down each benefit.

1. Increases Progesterone Levels

Some women with PCOS tend to have higher levels of LH (luteinizing hormone).

And when LH is high, that triggers the body to produce more androgens and more estrogen.

Unfortunately, the combination of elevated androgen and elevated estrogen ends up interfering with ovulation (source).

Interestingly enough, one way of counteracting this imbalance is to increase progesterone…which black cohosh happens to do quite well!

So, as progesterone levels rise, this eventually helps to restore hormonal balance and support a healthy monthly cycle.

2. Thickens The Endometrium

If you’re trying to conceive, then ovulation is just one of the many steps necessary for pregnancy to occur.

Another important step is implantation, which occurs when the fertilized egg attaches to the uterine lining (aka endometrium).

However, in order for implantation to occur you need an endometrium that is sufficiently thick and healthy.

Given that black cohosh shows the ability to thicken the endometrium, it’s a natural remedy that can help you when trying to conceive with PCOS.

3. Lowers LH and FSH/LH ratio

A healthy balance of FSH (follicle stimulating hormone) and LH is necessary for the follicle and egg to develop.

Now, normally, the FSH to LH ratio is 1:1. However, for many women with PCOS, that ratio can be 2:1 or 3:1 (source).

In addition, the normal range of LH is 4 – 8. However, if you have PCOS, then your LH might be in the range of 10-20.

This elevated LH is problematic because, as I mentioned earlier, this stimulates the release of more androgens and progesterone.

And that ultimately disrupts ovulation.

So, using black cohosh is a natural way to support all of these hormones and help them shift into harmony.

4. Regulates Insulin Levels

An animal study from 2014 showed that black cohosh helps to:

  • improve insulin sensitivity.
  • lower blood sugar levels.
  • reduce weight.

Now, even though this study was done with diabetic mice, it’s promising for anyone with PCOS because insulin resistance is a major underlying cause of PCOS.

Furthermore, the fact that black cohosh has insulin-regulating abilities is probably one reason why this herb has produced such positive results in human studies!

5. Eases PMS and Menstrual Cramps

Historically, black cohosh has been used as a natural remedy for menstrual cramps, headaches, anxiety and other PMS symptoms.

Since all of these symptoms can get worse with PCOS, adding black cohosh to your self care kit can help to make your cycles more enjoyable.


Even though there’s anecdotal and scientific evidence about what black cohosh can do, there’s less understanding of how it actually works.

At this point in time, the scientific community believes that black cohosh acts on the nervous system.

More specifically, it’s said that black cohosh might have an estrogenic effect on the nervous system.

Now, before you panic, please know that this estrogenic effect is a good thing! It’s actually part of how the body naturally operates.

  • You see, the nervous system coordinates various processes, including our menstrual cycle.
  • As estrogen levels fluctuate naturally throughout the month, different parts of the nervous system (specifically, the hypothalamus and pituitary), also adjust the release of various hormones in response to what is happening to estrogen.

It’s all a beautiful symphony!

But sometimes, that symphony needs a little help so that they play the same tune.

And it seems that black cohosh is able to act on the pituitary gland (which releases LH) and help your body self-regulate again.

Now, even though black cohosh may have estrogenic properties, it’s not entirely clear if it actually contains plant estrogens.

Yes, as old as this plant is, it’s still a mystery to modern science!

But one thing that isn’t a mystery is the results it can produce.

In fact, despite being a mystery, countries like Germany, have approved the use of black cohosh as a natural form of hormone replacement therapy.

This highlights the fact that this plant provides benefits that are simply hard to ignore.


Okay, now that you have an overview of what black cohosh has to offer, you might be wondering how to use it.

Well, let’s have a look.

How much black cohosh should I take for fertility?

Ideally, 20 to 40 mg of black cohosh per day can be used to support natural fertility and improve PCOS.

This suggested dosage is based on two things:

  • The dosage that was used in the PCOS study that I mentioned earlier. The women in that study were given 20 mg of black cohosh. Some sources state that the women took it twice a day, for a total of 40mg per day. Another source doesn’t state whether it was once or twice a day. So it could have been anywhere from 20 to 40mg per day.
  • Recommendations from herbalist and women’s health expert, Aviva Romm. Her website points out that black cohosh works better in lower doses (which she lists as 40mg).

So, based on all of the above, 20 to 40 mg seems to be the safest bet.

As for which form to take, the two best options are capsules or tincture.

For a capsule, I recommend buying it from Gaia Herbs, while for the tincture, you can get it from Herb Pharm.

Both of these companies are some of the best when it comes to herbs. They’re both known for their clean farming practices.

Plus, they’ve been in the herb production/farming industry for decades, and have a solid track record.

NOTE: black cohosh supplements usually contain approximately 1mg of the active ingredients for every 20mg of extract (source). So based on this, if you see a product that contains 400mg root extract per dose, that’s equivalent to 20mg of active ingredients. And that falls within the 20 – 40 mg dosage that are cited above.

When should I take black cohosh for fertility?

You can take black cohosh in the morning or afternoon. Either way, just make sure to take it with food.

Consuming it with food makes it easier to break down and digest.

black cohosh for pcos dosage


It’s a good idea to use black cohosh for about 2 months before expecting any major improvements.

Also, be aware that most experts recommend using this herb for no more than 6 months.

This is because most (but not all) of the studies done on black cohosh lasted for 6 months. There’s not sufficient data showing that it can be used safely for longer periods of time.

Also, keep in mind that like all herbs, the results you get from black cohosh depend greatly on your diet and lifestyle.

And when it comes to PCOS, fertility and carry a pregnancy all the way through, you need a solid foundation…which is diet/lifestyle.

So, to learn more about creating a healthy diet and lifestyle for PCOS, read this post on how to beat PCOS naturally, as well as this guide on what to include in your fertility diet to improve egg quality.


As long as you buy black cohosh from a reliable company and you follow the dosage guidelines, you shouldn’t experience any serious side effects.

But having said that, there are some reports that black cohosh can contribute to liver problems. However, my research on this was inconclusive because some articles pointed out that the liver problems could have been due to:

  • taking a high dose of the herb.
  • poor quality herb that contained toxins.

So, to be safe avoid using black cohosh if you or your family have a history of liver issues.

Lastly, if you’re allergic to plants in the buttercup family, then stay away from black cohosh since it’s in the same family.


How can I boost my ovulation naturally?

The best and most important way to boost ovulation is to follow a fertility diet that is rich in anti-inflammatory, nutrient-dense and unprocessed foods. 

What supplements should I take for PCOS?

A complete, daily supplement that has all the essential vitamins, minerals, fatty acids and amino acids is the most important place to start.

This ensures that you cover any nutrient deficiencies that could be contributing to the inflammation and hormonal imbalances that come with PCOS.

You can learn more about the daily supplement (and other supplements) that I recommend in this post on supplements for female hormonal imbalance.


Black cohosh root is just one of the many herbs that you can use for PCOS and fertility.

If you’d like to learn about other herbs that you can use for natural ovulation, read this post on natural alternatives to clomid.

And for more tips on foods, drinks and other natural remedies for PCOS, be sure to check out the list of related posts below.

As always, if you have any questions or comments about this post, feel free to drop your feedback below 🙂

Related Posts:

5 Ways to Use Ginger for PCOS

Maca Fertility Smoothie: Benefits, Best Type To Use and Recipe Tips

Vitex Vs. Clomid for Pregnancy: Pros & Cons, Success Rates, Side Effects and More

How to Make a Fertility Smoothie For PCOS: A Simple Guide With Recipes

Adaptogens For PCOS: Why You Need Them and Which Ones To Use

A Complete Guide to Using Cinnamon for PCOS: For Acne, Weight Loss, Menstrual Cycle and More!

Additional References: