  We explore the potential manifestation of a hexaquark, the H particle, as a
constituent within neutron stars. The H particle, characterized by a quark
composition of $uuddss$, is constructed using the framework of Chromomagnetic
Interaction (CMI). Specifically, we contemplate the flavor-singlet state H with
$J^P=0^+$. Our computations indicate that the three-flavor hexaquark state, the
H particle, possesses a lower mass of $2212.7~\rm{MeV}$ in comparison to the
$d^*(2380)$, implying greater stability than the two-flavor $d^*(2380)$. The
analysis involving the H particle is carried out using the relativistic
mean-field (RMF) model. We investigate the influence of H particle couplings, a
key factor in determining the system stability, and focus on the potential
existence of H particle within neutron stars. We find that H particle could
potentially endure as a stable constituent within neutron stars, and lead to a
reduction of the maximum mass.
