When you are trying to conceive, most conversations focus on ovulation, egg quality, sperm health, cycle timing, and hormone levels.

But one important fertility-related organ is often overlooked:

The thyroid.

Your thyroid is a small butterfly-shaped gland at the base of your neck, but it plays a major role in metabolism, energy, temperature regulation, hormone balance, menstrual cycles, ovulation, implantation, and early pregnancy.

When thyroid function is too low or too high, it can affect fertility.

Even mild imbalances may contribute to irregular cycles, ovulation issues, luteal phase concerns, miscarriage risk, or trouble maintaining a healthy early pregnancy.

Thyroid conditions should always be diagnosed and treated by a healthcare provider.

But nutrition can play a supportive role.

Certain nutrients help the thyroid produce hormones, convert inactive hormone into active hormone, protect thyroid tissue from oxidative stress, and support reproductive health.

Here are 8 thyroid-supportive foods that may also fit well into a fertility-focused nutrition plan.

This article is for educational purposes only and is not intended to provide medical advice. Always consult your doctor, endocrinologist, OB-GYN, reproductive endocrinologist, fertility specialist, or registered dietitian before making dietary, supplement, medication, or lifestyle changes related to thyroid or fertility health.

The thyroid produces hormones that influence nearly every system in the body.

The two main thyroid hormones are:

T4 is mostly inactive and must be converted into T3, the more active form.

These hormones help regulate:

Both hypothyroidism and hyperthyroidism can affect reproductive health.

Hypothyroidism means the thyroid is underactive.

Hyperthyroidism means the thyroid is overactive.

Autoimmune thyroid conditions, such as Hashimoto’s thyroiditis or Graves’ disease, may also affect fertility and pregnancy planning.

That is why thyroid testing is often part of fertility workups.

Resource: American Thyroid Association: Thyroid and Pregnancy

Brazil nuts are one of the richest food sources of selenium.

Selenium is a trace mineral that plays an important role in thyroid hormone conversion and antioxidant protection.

Selenium helps support enzymes involved in converting T4 into active T3.

It also helps protect thyroid tissue from oxidative stress.

This matters because the thyroid naturally produces oxidative byproducts as part of hormone production.

Selenium is also involved in reproductive health.

It may support:

A little goes a long way.

For many people, 1 to 2 Brazil nuts per day may provide enough selenium.

Do not overdo it.

Brazil nuts can contain very high selenium levels, and too much selenium can be harmful.

Resource: NIH: Selenium Fact Sheet

Iodine is essential for thyroid hormone production.

Your thyroid uses iodine to make T4 and T3.

Without enough iodine, the thyroid may struggle to produce adequate hormone.

Iodine is a building block of thyroid hormones.

For people who do not get enough iodine from food, iodized salt can be a simple way to support intake.

Adequate iodine is especially important before and during pregnancy because thyroid hormone supports fetal brain and nervous system development.

Women of reproductive age and pregnant people need enough iodine, but not excessive amounts.

More iodine is not always better.

Too much iodine can worsen some thyroid conditions, especially autoimmune thyroid disease in certain people.

Also, sea salt, Himalayan salt, kosher salt, and specialty salts often do not contain iodine unless the label says “iodized.”

Use iodized salt in moderation as part of a balanced diet.

Do not start high-dose iodine supplements unless your provider recommends them.

Resource: WHO: Iodine and Pregnancy

Salmon is rich in omega-3 fatty acids, high-quality protein, and vitamin D.

These nutrients can support both thyroid and fertility health.

Omega-3 fatty acids may support inflammation balance.

Vitamin D is also important because low vitamin D is common in people with thyroid autoimmunity.

Protein supports hormone production, tissue repair, and overall metabolic health.

Salmon may support fertility by providing:

Omega-3s may also support sperm health, egg environment, hormone balance, and early pregnancy nutrition.

Try:

Canned salmon can be more affordable than fresh salmon and still provides important nutrients.

Resource: Omega-3s and Autoimmune Thyroid Disease

Eggs are a simple, nutrient-dense food that can support thyroid and fertility nutrition.

They provide protein, choline, selenium, B vitamins, iodine, and tyrosine.

Tyrosine is an amino acid involved in thyroid hormone production.

Iodine and tyrosine work together as building blocks for T3 and T4.

Eggs also provide selenium and protein, which support thyroid and reproductive health.

Eggs provide choline, which is important for fetal brain development and early pregnancy.

They also support blood sugar balance and provide steady protein.

Try:

Resource: Harvard T.H. Chan: Egg Nutrition

Spinach is rich in folate, magnesium, vitamin K, antioxidants, and non-heme iron.

These nutrients can support both thyroid function and fertility wellness.

Iron is important for thyroid hormone production.

Low iron or low ferritin may worsen fatigue and can overlap with thyroid symptoms.

Magnesium also supports many metabolic and hormone-related processes.

Spinach provides folate, which supports ovulation, DNA synthesis, and early fetal development.

It also provides antioxidants that help protect cells from oxidative stress.

Try:

Pair spinach with vitamin C to improve iron absorption.

Good pairings include:

Resource: Iron and Thyroid Health

Lentils are affordable, filling, and packed with fertility-supportive nutrients.

They provide plant-based protein, fiber, iron, folate, zinc, and B vitamins.

Zinc is involved in thyroid hormone metabolism and immune function.

Iron and protein also support hormone production and energy.

Lentils may support:

Plant-based proteins may be especially useful in fertility-focused diets when they replace some highly processed or high-saturated-fat foods.

Try:

Resource: Harvard Health: Diet and Fertility

Berries are rich in antioxidants, fiber, vitamin C, and plant compounds that support overall health.

They are an easy addition to a thyroid- and fertility-friendly diet.

Thyroid conditions, especially autoimmune thyroid disease, may involve oxidative stress and inflammation.

Antioxidant-rich foods can help support the body’s natural defense systems.

Antioxidants may help protect eggs and sperm from oxidative stress.

Berries also support blood sugar balance better than many high-sugar desserts or refined snacks.

Try:

Add berries to:

Frozen berries are often cheaper than fresh and last longer.

Resource: NIH: Antioxidants and Thyroid Health

Coconut oil is often discussed in thyroid wellness spaces, but it is important to keep the claim balanced.

It is not a cure for hypothyroidism, and it does not replace thyroid medication.

However, it can be used as a stable cooking fat and may be a better option than hydrogenated oils or trans fats.

Coconut oil contains medium-chain triglycerides, also called MCTs.

MCTs are metabolized differently than some other fats and may provide quick energy for some people.

However, evidence that coconut oil directly improves thyroid function is limited.

Healthy fats are important for hormone production and meal satisfaction.

Coconut oil can be part of a balanced diet, but it should not be the only fat you use.

Other fertility-friendly fats include:

Try using small amounts to:

Resource: MCTs and Metabolism

You may have heard that foods like broccoli, kale, cauliflower, cabbage, Brussels sprouts, and soy contain compounds called goitrogens.

Goitrogens can interfere with thyroid hormone production in certain situations, especially when iodine intake is low.

But for most people, cruciferous vegetables are not something to fear.

They may be more concerning when:

Cooking cruciferous vegetables reduces much of the goitrogenic activity.

These foods also provide fiber, antioxidants, folate, and important fertility-supportive nutrients.

You usually do not need to avoid broccoli, kale, or cabbage completely.

Instead, cook them and eat them in reasonable portions unless your provider recommends otherwise.

Resource: NIH: Cruciferous Vegetables and Thyroid

Here is a simple grocery list to support thyroid and fertility nutrition.

Before changing your diet or supplements, ask:

Your thyroid may be small, but it plays a major role in fertility.

It helps regulate ovulation, menstrual cycles, metabolism, energy, implantation, and early pregnancy development.

If you have a thyroid condition, medical care matters most.

But nutrition can support the foundation your body needs.

Foods like Brazil nuts, iodized salt, salmon, eggs, spinach, lentils, berries, and healthy fats can provide key nutrients involved in thyroid and reproductive health.

The goal is not perfection.

It is steady, supportive nourishment.

Start with simple additions.

Add spinach to eggs.

Use iodized salt if appropriate.

Include salmon or sardines.

Snack on berries.

Make lentil soup.

Choose a few Brazil nuts instead of handfuls.

And work with your provider to make sure your thyroid levels, nutrients, and fertility goals are aligned.

Supporting your thyroid is one more way to support your fertility journey with clarity and care.