  We estimate the intrinsic charm contributions to the quark flavor and spin
observables of the nucleon in the SU(4) quark meson fluctuation model. In this
model, the charm or anticharm reside in the charmed mesons created by the
nonperturbative quantum quark-meson fluctuations. The intrinsic charm content
in the proton, $2\bar c/\sum(q+\bar q) \simeq 0.011\pm 0.008$, is almost one
order of magnitude smaller than the intrinsic strange content. The intrinsic
charm helicity is also small and negative, $\Delta c\simeq -(0.009\pm 0.006)$.
The fraction of the total quark helicity carried by the charm is $|\Delta
c/\Delta \Sigma|\simeq 0.021\pm 0.014$. The ratio of the charm with positive
helicity to that with negative helicity is $c_\up/c_\dw=35/67$. For the
intrinsic strange component, one has $s_\up/s_\dw\simeq 7/13$. A detail
comparison of our predictions with data and other models or analyses is given.
The intrinsic charm contribution to the Ellis-Jaffe sum rule is also discussed.
