Thymosin ß has effects on the immune system by promoting the development and function of T cells. It increases the production and maturation of T cells in the thymus gland. This leads to enhanced immune function and response against infections and cancers. However, some potential side effects can include headache, dizziness, and gastrointestinal issues like nausea, diarrhea, and loss of appetite. More research is still needed to fully understand all the impacts of Thymosin ß supplementation on the human body.