  The discovery of a relatively heavy Standard Model (SM) -like Higgs boson
challenges naturalness of the minimal supersymmetric standard model (MSSM) from
both Higgs and dark matter (DM) sectors. We study these two aspects in the MSSM
extended by the low-scale inverse seesaw mechanism. Firstly, it admits a
sizable radiative correction on the Higgs boson mass m_h, up to \sim 4 GeV in
the case of an IR-fixed point of the coupling Y_\nu LH_u\nu^c and a large
sneutrino mixing. Secondly, the lightest sneutrino, highly complex as expected,
is a viable thermal DM candidate. Owing to the correct relic density and
XENON100, two cases survive: a Higgs-portal complex DM with mass lying around
the Higgs pole or above $W$ threshold, and a coannihilating DM with slim
prospect of detection. Given an extra family of sneutrinos, both scenarios
naturally work when we attempt to suppress the DM left-handed sneutrino
component, confronting with enhancing m_h.
