Let I be an ideal generated by polynomials P1, . . . , Pm ∈ Z[X1, . . . , Xn], and P be an isolated prime component of I. If the projection of Zero(P) ⊆ C n onto the first coordinate is a finite set, and ζ = (ζ1, . . . , ζn) ∈ Zero(P) where ζ1 = 0, then we prove a lower bound on |ζ1| in terms of n, m and the maximum degree D and maximum height H of the polynomials.