How to Lower TSH for Fertility [2025 Guide]

If you’ve recently had your thyroid checked as part of fertility testing, you may have heard your doctor mention your TSH levels. And if they’re even slightly elevated, it’s normal to feel confused or concerned—especially if no one has explained what it means for your fertility.

At fertie, we’re here to make the medical part feel a little less overwhelming—and give you the clarity to move forward with confidence.

So, let’s break it down: What is TSH? Why does it matter for fertility? And what can you do to lower it, naturally or with treatment?

What Is TSH—and Why Does It Matter for Fertility?

TSH (Thyroid Stimulating Hormone) is produced by your pituitary gland and tells your thyroid when to release hormones like T3 and T4, which regulate metabolism, energy, and reproductive hormones.

When it comes to fertility:

• TSH plays a big role in ovulation and menstrual regularity

• Even mildly elevated levels (called subclinical hypothyroidism) can reduce your chances of getting pregnant or increase the risk of miscarriage

Most fertility specialists aim for a TSH level between 1.0 and 2.5 mIU/L for those trying to conceive or undergoing IVF.

How to Lower TSH Levels (Safely)

If your TSH is slightly high—let’s say 3.5 or 4.0—it doesn’t always mean something is “wrong.” But bringing it into the optimal range may improve your chances of conception and healthy pregnancy.

Here’s what you can do:

1. Talk to Your Doctor About Medication

• The most common treatment is Levothyroxine, a thyroid hormone replacement

• It’s often prescribed even with mildly elevated TSH if you're TTC or doing IVF

• It’s safe in pregnancy and can support a healthy hormone environment

Important: Don’t self-medicate with thyroid hormones. Always work with a healthcare provider who understands fertility.

2. Support Thyroid Health With Nutrition

Certain nutrients support healthy thyroid function:

• Iodine (if you’re deficient): found in seaweed, eggs, iodized salt

• Selenium: Brazil nuts, sunflower seeds, whole grains

• Zinc & Iron: meats, lentils, pumpkin seeds

• Vitamin D: sunlight, supplements if needed

• Avoid too much soy or raw cruciferous veggies (e.g. raw kale) if you have an underactive thyroid

If you're plant-based, it’s especially important to monitor these nutrients.

3. Reduce Chronic Stress

Chronic stress can impact your thyroid by suppressing the hypothalamic-pituitary-thyroid (HPT) axis. In simpler terms: your body may “slow down” hormone production in response to ongoing stress.

Try:

• Gentle movement like yoga or walking

• Sleep hygiene

• Mindfulness or breathwork

• Acupuncture (some people find it helpful for thyroid + fertility support)

4. Cut Back on Endocrine Disruptors

Environmental toxins can mess with your thyroid. Reduce your exposure by:

• Choosing BPA-free plastics

• Avoiding heavily fragranced personal care products

• Using non-toxic cleaning products

• Filtering your tap water (especially in areas with known contaminants)

It’s not about being perfect—just making small swaps where you can.

Personal Insight: “I Didn’t Realize TSH Could Affect My Cycle”

“I kept getting normal periods, but my AMH was low and I wasn’t ovulating regularly. Turns out my TSH was 3.8. My doctor put me on a low dose of Levothyroxine, and within two months, my ovulation returned. I had no idea my thyroid was holding things back.”
— fertie Community Member

Final Thoughts

If you’ve been told your TSH is slightly high—or just feel like something’s off—know this: you’re not alone, and there are ways to improve it.

Whether through medication, diet, or lifestyle shifts, small changes can make a big difference. And the sooner you know where your numbers stand, the more empowered you’ll feel moving forward.

👉 Inside our Fertility 101 course, we walk you through fertility testing (including thyroid hormones), how to understand your results, and what to ask your doctor—so you can advocate for yourself with clarity and calm.

You don’t have to figure this alone

Inside fertie, you’ll get:

• Expert-led courses to make informed decisions

• Private support from women on the same path

• Exclusive partner clinic perks & discounts

Disclaimer: Prices and treatment protocols vary by clinic and individual. Always consult with your fertility specialist for accurate, up-to-date pricing and guidance tailored to your situation.