# Selenium in the second trimester

Source: https://www.pregnancypowerhour.com/nutrition/selenium-trimester-2
Last updated: 2026-07-01

> In the second trimester, selenium continues its vital role as an antioxidant and supports healthy thyroid function, crucial for both your well-being and your baby's development.

As you move through the second trimester, the mineral selenium maintains its essential role in supporting your body's antioxidant defenses and thyroid health, both of which are foundational for a smooth progression of pregnancy and your baby's ongoing development. This period often brings a renewed sense of energy, and ensuring adequate selenium intake can contribute to sustaining that vitality while your body continues its remarkable work.

Selenium acts as a powerful antioxidant, helping to protect your cells from oxidative stress. This is particularly relevant as your body undergoes significant changes and growth during pregnancy. Beyond its antioxidant properties, selenium is also critical for healthy thyroid function. Your thyroid gland plays a central role in regulating metabolism and energy, and its optimal function is important for both you and your baby's developing systems. The Institute of Medicine (IOM) suggests a daily intake of 60 mcg for pregnant individuals, an amount that can typically be met through a thoughtful food-first approach.

Integrating selenium-rich foods into your diet is a practical way to support these functions. Brazil nuts are an exceptional source, with just one or two nuts often providing your daily needs. Other valuable sources include seafood, eggs, sunflower seeds, chicken, and beef. It's worth noting that the selenium content in foods can vary depending on the soil quality where they are grown or raised. For instance, while regions in the US and Canada generally have adequate soil selenium, some parts of Europe and Asia may have lower levels, which could influence the selenium content of local produce and animal products.

While focusing on food sources, it's also helpful to be aware of the upper limit for selenium intake. Exceeding 400 mcg per day can lead to toxicity, with symptoms like hair loss and gastrointestinal distress. This is why a balanced diet is often the most effective and safest way to meet your nutritional needs. Just as with [Omega-6 Fatty Acids in the second trimester](/nutrition/omega-6-trimester-2), understanding the nuances of nutrient intake allows for more informed decisions. If you have questions about your specific intake or dietary choices, your care provider is your best resource.

Considering your selenium intake throughout pregnancy offers continuous support. For insights into earlier stages, you might explore [Selenium in the first trimester](/nutrition/selenium-trimester-1), and to prepare for what's ahead, [Selenium in the third trimester](/nutrition/selenium-trimester-3) provides further guidance. Prioritizing these foundational nutrients can bring a sense of calm and confidence as your pregnancy progresses.