
08/02/2025
Why Triiodothyronine (T3) and Thyroxine (T4) Are the Real MVPs in Thyroid Function: An Unfiltered Look
Let’s give credit where credit is due: T3 and T4 are the real MVPs behind your body’s energy, temperature, and mood.
These two hormones—Triiodothyronine (T3) and Thyroxine (T4)—are produced by your thyroid gland and are essential to your metabolism and overall health. They may have long names, but their roles are surprisingly straightforward—and powerful.
What Do T3 and T4 Do?
T4 is the storage form of thyroid hormone, while T3 is the active form. Your body converts T4 into T3, which then acts on your cells to regulate metabolism, heart rate, body temperature, and even brain function.
When Things Go Sideways
Low levels of T3 and T4 can cause hypothyroidism—cue fatigue, weight gain, depression, and brain fog. High levels lead to hyperthyroidism, which can result in rapid heartbeat, anxiety, weight loss, and sleep issues.
It’s not just about whether your thyroid works—it’s about how well your body is making T4 to T3. Some people have “normal” labs but still feel off because of poor T3 and T4 production. That’s why working with a practitioner who understands the full thyroid picture is key.
The Bottom Line
T3 and T4 may not be household names, but they control the thermostat of your life. So if your mood, energy, or metabolism are unpredictable, dig deeper. These MVPs might be calling for attention.
Curious about your T3/T4 levels? We can help. Reach out at www.Axioshealthco.com, or give us a call at 720-899-9400.