  We explore the sensitivity of the flavour changing neutral currents among c
and u quarks in the context of the Minimal Supersymmetric Standard Model. The
standard model rate for c->u gamma can be enhanced by up to two orders of
magnitudes in general MSSM, while the c->ul^+l^- rate can be enhanced by at
most a factor of three. The most suitable hadronic observable to probe the c->u
gamma transition is the decay B_c->B_u^* gamma or the difference in decay rates
of D^0->rho^0 gamma and D^0->omega gamma, since they are relatively free of the
long distance contributions. The c ->ul^+l^- transition may be probed in D ->pi
l^+l^- decays at high high di-lepton mass and we predict the long distance
contributions for these modes.
