Discover what science is revealing about red light therapy, inflammation, and thyroid function. Your thyroid may be small, but it has a BIG job! This butterfly-shaped gland sits at the front of your neck and helps control your metabolism, energy, body temperature, and many other important functions. When your thyroid isn't working properly, you may experience: Constant fatigue and low energy Unexplained weight gain Brain fog and trouble concentrating Hair thinning or hair los