Tesamorelin is an FDA-approved prescription therapeutic (brand name Egrifta) for a specific clinical indication, and its use for general bodybuilding, fat loss, or anti-aging purposes in people without that diagnosis is an off-label application, not an over-the-counter supplement use
Altered glutathione anti-oxidant metabolism during tumor progression in human renal cell carcinoma
Liu J, Liu L, Han YS, Yi J, Guo C, Zhao HQ, et al
However, too much iodine can actually activate thyroiditis, so if you supplement, (kelp being one of the most popular for dogs), please use with caution
The exact reasons for this are still being investigated, but it is believed to occur through multiple mechanisms