Letrozole for Fertility: What Catholic Women Need to Know — Including Why It Might Not Be Enough
If you've been prescribed letrozole and you're wondering whether it's okay from a faith standpoint, whether it's actually getting to the root of your problem, or why it doesn't seem to be working — this post is for you.
First: Is Letrozole Okay for Catholics?
This is usually the first question — and it deserves a real answer before anything else.
Yes. Letrozole used for ovulation induction is generally considered morally acceptable by the Catholic Church.
Here's the simple way to think about it: Catholic teaching draws a line between treatments that replace the marital act (like IVF, which the Church considers morally unacceptable) and treatments that support what your body is already designed to do. Letrozole falls into the second category. It helps your body ovulate so that conception can happen naturally, through the marital act.
That's actually very aligned with how NaProTECHNOLOGY approaches fertility — working with the body and the cycle, not around it. NaPro doctors do use fertility medications, including ovulation support, because the goal is to restore the body's natural function.
The key difference: letrozole helps your body do what it was made to do. IVF replaces it entirely.
So if your doctor has prescribed it, you can move forward with peace of mind on the faith question part.
What Letrozole Actually Does
Letrozole (brand name Femara) was originally developed for breast cancer treatment. Fertility doctors discovered it's also really effective at stimulating ovulation (especially used with women with PCOS) and it's now considered a first-line medication for ovulation induction.
Here's the basic idea of how it works:
Letrozole temporarily lowers estrogen
Your brain sees low estrogen and thinks the ovaries need more help
It sends out more FSH and LH (the hormones that grow and release follicles)
A follicle matures and ovulation happens
It's typically prescribed at 2.5 mg, 5 mg, or 7.5 mg daily for 5 days, starting around cycle days 3–5.
Why many providers prefer it over Clomid:
Higher pregnancy and live birth rates, especially for women with PCOS
More likely to result in one dominant follicle (lower twin risk)
Better for the uterine lining
Less negative impact on cervical mucus
Here's What Most Women Are Never Told
This is the part that (in my opinion) really matters.
If you need letrozole to ovulate, we need to ask WHY your body isn’t ovulating on its own. The medication is meant to help produce an egg.... but it does not fix the root of why you are not ovulating on your own.
That's not a criticism of letrozole — it may be a genuinely useful tool. But if no one is asking why you're not ovulating (or why you are not getting pregnant in the first place), you may find yourself going round after round without it working.
Common Root Causes of Irregular or Missing Ovulation
Insulin Resistance This is more common than most people realize — and you don't have to have a PCOS diagnosis or be diabetic to have it. Insulin resistance disrupts the hormonal signals needed for ovulation.
Signs/Symptoms include: sugar cravings, energy crashes, or difficulty losing weight.
PCOS/PMOS The most common reason letrozole gets prescribed. But PMOS is a whole body endocrine dysruption — it has multiple potential drivers underneath it, including insulin resistance, inflammation, adrenal issues, and gut issues. Causing ovulation to occur does not address nor help you manage PMOS.
Thyroid Issues Even "subclinical" thyroid problems — labs that fall within normal range but aren't optimal for fertility. This can significantly impact ovulation and implantation. A TSH of 3.5 might be called "normal" but many women do much better closer to 1–2 when trying to conceive. Most standard workups don't look at the full thyroid picture (free T3, free T4, reverse T3, antibodies).
Chronic Stress and HPA Axis Dysregulation Your body has a built-in safety mechanism: when it senses chronic stress, it down-regulates reproduction. Your brain interprets long-term stress as an unsafe environment to reproduce and can suppress the signals needed to ovulate. This isn't a mindset issue — it's physiology. But it does mean that stress is not a small factor. In fact, many of our clients are experiencing daily chronic stress they were not aware of.
Under-Fueling This one is often overlooked. Women who aren't eating enough — whether from a busy life, a history of restriction, or just not prioritizing food — may not have the caloric and nutritional resources for their body to prioritize ovulation. Reproduction is energetically expensive. If your body perceives scarcity, it may put fertility on pause.
Too Much Exercise High-intensity or high-volume training without enough recovery and/or food can suppress the reproductive axis. It's not about stopping exercise — it's about making sure your body has enough in the tank to live life AND be active.
Elevated Prolactin High prolactin suppresses ovulation. It can come from thyroid issues, certain medications, stress, or sometimes a small pituitary growth. It's treatable, but you have to know to look for it.
Adrenal Dysfunction and Elevated DHEA-S The adrenal glands produce androgens, and too much of them can interfere with ovulation. Chronic stress, poor sleep, and blood sugar swings all put a load on the adrenals which can prevent ovulation from occurring.
Nutrient Deficiencies Specific nutrients are critical for ovulation and egg quality — magnesium, zinc, vitamin D, B vitamins, CoQ10, omega-3s, iron. You can be eating a "healthy diet" and still be depleted, especially if you are between babies, have a history of (or are currently) dieting, or have been living in a chronically stressed state for a while —-stress depletes nutrients.
Gut Dysfunction and Inflammation An imbalanced gut affects how your body metabolizes estrogen, drives inflammation, and impairs nutrient absorption — all things that directly impact your cycle and how your body produces hormones.
Why Letrozole Might Not Be Working
If you've done one or more rounds without a pregnancy, here's what's worth looking into:
Ovulation is happening, but implantation isn't Letrozole gets an egg out. But for conception to stick, you also need adequate progesterone after ovulation, a healthy uterine lining, and no structural issues (polyps, fibroids, adenomyosis). Many women ovulate successfully on letrozole but have a luteal phase that isn't strong enough to support implantation.
Worth asking: What is my naturaly progesterone production at 7 days post-ovulation?
The root cause hasn't been addressed If insulin resistance, thyroid dysfunction, or adrenal issues are driving the anovulation (lack of ovulation), the medication will try to work around those issues each cycle — but that does not mean that the root-causes were addressed. They are still there.
Egg quality is a factor No ovulation-induction medication improves egg quality directly. Nutrition, targeted supplementation, and reducing inflammation can.
Male factor hasn't been ruled out In roughly 30–40% of cases, the male side contributes to or is the primary cause. If a semen analysis hasn't already been done, it should be.
Something structural is going on Blocked tubes, endometriosis, or uterine polyps will prevent pregnancy regardless of whether ovulation is happening. These need to be identified and addressed.
Questions Worth Asking About Letrozole
Whether you're about to start letrozole, in the middle of it, or wondering why it's not working, these are the questions that matter:
Am I actually ovulating on my own, or only on medication?
What does my full thyroid panel look like — not just TSH?
Has insulin resistance been ruled out with fasting insulin, not just blood sugar?
What is my progesterone 7 days after ovulation?
Has my husband had a semen analysis?
Do I have endometriosis, polyps, or fibroids that haven't been found yet?
Am I eating enough to support a pregnancy?
Are my blood sugars stable and conducive to ovulation?
What does my stress load and sleep actually look like?
A Word for Catholic Women Specifically
There's something really coherent about a root-cause approach to fertility and the Catholic understanding of the body. Your body isn't a machine to override — it was made with a purpose. It was made to communicate with you when something is off. Fertility is a signal that gets our attention.
When fertility is impaired, the better question isn't what can I take to make my body ovulate? It's what does my body need in order to function the way it was designed to?
Letrozole can be part of that picture for some women. The issue is when it becomes the only answer — a monthly workaround without anyone asking more questions.
Ready to get to the root of why you aren’t ovulating?
If something in this post made you feel like there's more to the story, it’s because there likely is.
I created a free guide specifically for Catholic women who are tired of being told their labs look "normal" even though they aren’t getting pregnant: A Catholic Woman's Guide to 'Unexplained' Infertility.
Inside, you'll find the root-cause questions your providers may not be asking, what to actually look for in your labs, and how to start understanding what your body is trying to tell you so you can bring your fertility back online
→ Download it free at savorli.co/catholic-unexplained-infertility-guide
Your body is not failing you. It's communicating. Let's figure out what it's saying.
— Lucia, Catholic Fertility Dietitian
