  The reduced 5D Heterotic M-theory has a deeply rich structure. For every
Calabi-yau compactification, there exists a gravitational hypermultiplet
$(g_{\mu\nu},\psi_{\mu},A_{\mu})$ and a universal hypermultiplet. In this paper
we derive the formulae for the masses of the scalar sector of the universal
hypermultiplet $(V,\sigma,\zeta,\bar{\zeta})$ in the framework of 5D Heterotic
M-theory.
