For the past several years, I have had a low body temperature running at 97.7⁰F. My Thyroid hormone levels are normal, including my Free T3. I have not been able to raise my temp by exercise of diet. I eat organic, am gluten free, casein free and do not eat any GMO foods or processed foods. I started taking Immune Force several months ago and last week, to my pleasant surprise, my body temp came up to 98.4⁰F. I cannot attribute this to anything other than Immune Force. I am quite impressed by this product.