  We study natural supersymmetric scenarios with light right-handed neutrino
superfields, and consider the possibility of having either a neutrino or a
sneutrino as a dark matter candidate. For the former, we evaluate the
possibility of having SUSY corrections on the $\nu_4\to\nu_\ell\gamma$ decay
rate, such that the NuStar bounds are relaxed. We find that corrections are too
small. For sneutrino dark matter, we consider thermal and non-thermal
production, taking into account freeze-out, freeze-in and super-WIMP
mechanisms. For the non-thermal case, we find that the $\tilde\nu_R$ can
reproduce the observed relic density by adjusting the R-sneutrino mass and
Yukawa couplings. For the thermal case, we find the need to extend the model in
order to enhance sneutrino annihilations, which we exemplify in a model with an
extended gauge symmetry.
