On supersymmetry at finite temperature

We consider the effective theories governing the sensitivity to the plasma of certain high-energy observables in supersymmetric plasmas, and point out that they preserve supersymmetry. Our findings generalize previous observations on symptotic thermal masses in weakly coupled plasmas, to both the real and imaginary parts of self-energies, on the light cone and away from it, in weakly and strongly interacting theories. All observed supersymmetry violations due to thermal effects vanish faster than $E^{-2}$ in the high energy limit.