I agree with Jimmy and would take the advice one step farther..

Just about anything used to soften or condition the skin can soften or condition leather... The problem comes for the fact that the skin is washed and cleaned and these conditioners are not allowed to sit and dry or breakdown on the skin...
With leather this does happen, so really when using a conditioner on leather one wants to understand what the "conditioner" will be like not only next week, but next year.....