We present an abundance analysis of light elements in the most massive chemically peculiar (CP) stars, He-rich stars. The analysis is based on both low and high-resolution observations collected at ESO, La Silla, Chile in the optical region and includes 6 standard and 21 He-rich stars. Light element abundances display a diverse pattern from under-solar up to above-solar values. Carbon is definitely underabundant and tends to have the abundance of standard stars for the coolest He-rich stars, following the model predictions. The distribution of projected rotational velocities shows an excess of slow rotators, no He-rich stars having vsini > 130 km s ^-1.